WO2010021315A1 - 高耐熱性β型ゼオライト及びそれを用いたSCR触媒 - Google Patents
高耐熱性β型ゼオライト及びそれを用いたSCR触媒 Download PDFInfo
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- WO2010021315A1 WO2010021315A1 PCT/JP2009/064411 JP2009064411W WO2010021315A1 WO 2010021315 A1 WO2010021315 A1 WO 2010021315A1 JP 2009064411 W JP2009064411 W JP 2009064411W WO 2010021315 A1 WO2010021315 A1 WO 2010021315A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydrothermal durability
- durability treatment
- sio
- molar ratio
- type zeolite
- Prior art date
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- 239000010457 zeolite Substances 0.000 title claims abstract description 97
- 229910021536 Zeolite Inorganic materials 0.000 title claims abstract description 94
- 239000003054 catalyst Substances 0.000 title claims abstract description 50
- 230000009467 reduction Effects 0.000 claims abstract description 13
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 9
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000011737 fluorine Substances 0.000 claims abstract description 8
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 125000003282 alkyl amino group Chemical group 0.000 claims abstract 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 99
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 93
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 66
- 229910052742 iron Inorganic materials 0.000 claims description 46
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 45
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 26
- 238000005004 MAS NMR spectroscopy Methods 0.000 claims description 23
- 238000002425 crystallisation Methods 0.000 claims description 18
- 230000008025 crystallization Effects 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 16
- 150000003973 alkyl amines Chemical class 0.000 abstract description 8
- 239000000377 silicon dioxide Substances 0.000 abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010335 hydrothermal treatment Methods 0.000 abstract 3
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 78
- 239000000203 mixture Substances 0.000 description 26
- 239000007864 aqueous solution Substances 0.000 description 25
- 238000000034 method Methods 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 22
- 239000013078 crystal Substances 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000011541 reaction mixture Substances 0.000 description 19
- 229910001868 water Inorganic materials 0.000 description 19
- 239000007789 gas Substances 0.000 description 18
- 150000001412 amines Chemical class 0.000 description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 12
- 238000004400 29Si cross polarisation magic angle spinning Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 11
- 238000003756 stirring Methods 0.000 description 11
- 230000003197 catalytic effect Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 229910000323 aluminium silicate Inorganic materials 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 8
- 238000011068 loading method Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 239000004115 Sodium Silicate Substances 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 6
- 229910052911 sodium silicate Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 5
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005481 NMR spectroscopy Methods 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- -1 silicon alkoxide Chemical class 0.000 description 3
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 3
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 2
- GTEXIOINCJRBIO-UHFFFAOYSA-N 2-[2-(dimethylamino)ethoxy]-n,n-dimethylethanamine Chemical compound CN(C)CCOCCN(C)C GTEXIOINCJRBIO-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- WFPZPJSADLPSON-UHFFFAOYSA-N dinitrogen tetraoxide Chemical compound [O-][N+](=O)[N+]([O-])=O WFPZPJSADLPSON-UHFFFAOYSA-N 0.000 description 2
- LZDSILRDTDCIQT-UHFFFAOYSA-N dinitrogen trioxide Chemical compound [O-][N+](=O)N=O LZDSILRDTDCIQT-UHFFFAOYSA-N 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 229960001730 nitrous oxide Drugs 0.000 description 2
- 235000013842 nitrous oxide Nutrition 0.000 description 2
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- UKODFQOELJFMII-UHFFFAOYSA-N pentamethyldiethylenetriamine Chemical compound CN(C)CCN(C)CCN(C)C UKODFQOELJFMII-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000011973 solid acid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- CBXCPBUEXACCNR-UHFFFAOYSA-N tetraethylammonium Chemical compound CC[N+](CC)(CC)CC CBXCPBUEXACCNR-UHFFFAOYSA-N 0.000 description 2
- HWCKGOZZJDHMNC-UHFFFAOYSA-M tetraethylammonium bromide Chemical compound [Br-].CC[N+](CC)(CC)CC HWCKGOZZJDHMNC-UHFFFAOYSA-M 0.000 description 2
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 description 2
- VKABKQBHBBROCU-UHFFFAOYSA-N 2-(2,2,3-trimethylpiperazin-1-yl)ethanamine Chemical compound CC1NCCN(CCN)C1(C)C VKABKQBHBBROCU-UHFFFAOYSA-N 0.000 description 1
- SDMNEUXIWBRMPK-UHFFFAOYSA-N 2-(2-methylpiperazin-1-yl)ethanol Chemical compound CC1CNCCN1CCO SDMNEUXIWBRMPK-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241000282341 Mustela putorius furo Species 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- JIUIIWVYHWSFAZ-UHFFFAOYSA-N ac1o0v2m Chemical compound O.O.O.O.O JIUIIWVYHWSFAZ-UHFFFAOYSA-N 0.000 description 1
- DPRMFUAMSRXGDE-UHFFFAOYSA-N ac1o530g Chemical compound NCCN.NCCN DPRMFUAMSRXGDE-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910001583 allophane Inorganic materials 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- IMUDHTPIFIBORV-UHFFFAOYSA-N aminoethylpiperazine Chemical compound NCCN1CCNCC1 IMUDHTPIFIBORV-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- LPCWKMYWISGVSK-UHFFFAOYSA-N bicyclo[3.2.1]octane Chemical compound C1C2CCC1CCC2 LPCWKMYWISGVSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001103 continuous-wave nuclear magnetic resonance spectrum Methods 0.000 description 1
- WJTCGQSWYFHTAC-UHFFFAOYSA-N cyclooctane Chemical group C1CCCCCCC1 WJTCGQSWYFHTAC-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- UYMKPFRHYYNDTL-UHFFFAOYSA-N ethenamine Chemical class NC=C UYMKPFRHYYNDTL-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
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- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- LSHROXHEILXKHM-UHFFFAOYSA-N n'-[2-[2-[2-(2-aminoethylamino)ethylamino]ethylamino]ethyl]ethane-1,2-diamine Chemical compound NCCNCCNCCNCCNCCN LSHROXHEILXKHM-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229940078552 o-xylene Drugs 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
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- 239000010421 standard material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000012970 tertiary amine catalyst Substances 0.000 description 1
- YMBCJWGVCUEGHA-UHFFFAOYSA-M tetraethylammonium chloride Chemical compound [Cl-].CC[N+](CC)(CC)CC YMBCJWGVCUEGHA-UHFFFAOYSA-M 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- PTMFUWGXPRYYMC-UHFFFAOYSA-N triethylazanium;formate Chemical compound OC=O.CCN(CC)CC PTMFUWGXPRYYMC-UHFFFAOYSA-N 0.000 description 1
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/7007—Zeolite Beta
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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Definitions
- the present invention provides ⁇ -type zeolite having high heat resistance useful as an adsorbent and a catalyst, a production method thereof, and an application thereof.
- ⁇ -type zeolite is a zeolite having 12-membered ring pores disclosed for the first time in Patent Document 1, and is widely used as an adsorbent and a catalyst.
- the catalyst performance may be reduced with the collapse of the zeolite crystal structure, and improvement in heat resistance is required.
- a method of increasing the SiO 2 / Al 2 O 3 molar ratio Patent Document 2
- a method of treating zeolite at a high temperature Patent Document 3
- a method of increasing the crystallite diameter Patent Document 2 4 to 6
- a method using fluorine Patent Document 7
- SCR catalyst using zeolite catalyst utilizing NOx reduction reaction using ammonia as a reducing agent.
- SCR is an abbreviation of “Selective catalytic reduction”
- has high low-temperature activity after hydrothermal durability treatment particularly 300 ° C. or less. Is required to have high activity (Patent Document 8).
- the SCR catalyst requires a high acid amount (low SiO 2 / Al 2 O 3 molar ratio), so a method for increasing the SiO 2 / Al 2 O 3 molar ratio to improve heat resistance, and a high temperature that causes dealumination from the skeleton. Processing is not available.
- zeolites with low SiO 2 / Al 2 O 3 molar ratio, high heat resistance and high catalytic activity, especially NOx reduction rate after hydrothermal endurance treatment when used in SCR catalyst is 200-250 ° C.
- ⁇ zeolite that is high even at low temperatures.
- a method for producing ⁇ -type zeolite a method for synthesizing ⁇ -type zeolite having a large crystal size of 0.1 to 3 ⁇ m by adding a tertiary alkanolamine in addition to tetraethylammonium cation is disclosed (patent) Reference 9).
- ⁇ zeolite produced by such a method was not excellent in hydrothermal durability.
- Patent Document 10 a method for synthesizing ⁇ -type zeolite containing diethylenetetramine in a structure directing agent (referred to as SDA) is disclosed (Patent Document 10).
- SDA structure directing agent
- the present invention provides a novel ⁇ -type zeolite having high adsorption performance and high heat resistance, a method for producing the same, and an SCR catalyst using the zeolite.
- a ⁇ -type zeolite having a high acid content of SiO 2 / Al 2 O 3 molar ratio of 20 or more and less than 30 and having a crystallite diameter reduction rate of less than 10% before and after hydrothermal durability treatment has been found to have high catalytic performance at low temperatures, and the present invention has been completed.
- the gist of the present invention resides in the following (1) to (9).
- (1) The SiO 2 / Al 2 O 3 molar ratio is 20 or more and less than 30, the crystallite diameter before hydrothermal durability treatment is 20 nm or more, and the change in crystallites before and after the hydrothermal durability treatment is less than 10%, A ⁇ -type zeolite having a fluorine content of 0.1% by weight or less.
- the framework SiO 2 / Al 2 O 3 molar ratio (n) by 29 Si MAS NMR is 20 or more and less than 30 before the hydrothermal durability treatment, and the framework SiO 2 / Al 2 O 3 molar ratio after the hydrothermal durability treatment
- the ⁇ -type zeolite provided by the present invention has high heat resistance and a low SiO 2 / Al 2 O 3 molar ratio, and thus has a high acid amount.
- hydrothermal durability Excellent especially NOx reducing ability at low temperatures.
- FIG. 2 is a diagram showing a 29 Si MAS NMR spectrum of the ⁇ -type zeolite before supporting iron obtained in Example 1.
- FIG. 3 is a diagram showing a 29 Si MAS NMR spectrum of the ⁇ -type zeolite after supporting iron obtained in Example 1.
- FIG. 4 is a diagram showing a 29 Si MAS NMR spectrum of the ⁇ -type zeolite before supporting iron obtained in Comparative Example 2.
- 4 is a diagram showing a 29 Si MAS NMR spectrum of ⁇ -type zeolite after iron loading obtained in Comparative Example 2.
- the ⁇ -type zeolite of the present invention has a SiO 2 / Al 2 O 3 molar ratio of 20 or more and less than 30. If it is less than 20, the heat resistance is not sufficient, and in general, when the heat resistance is 30 or more, the acid point required for the catalytic reaction is reduced, and as a result, the catalytic performance of the SCR catalyst made of the zeolite is lowered. To do.
- the SiO 2 / Al 2 O 3 molar ratio referred to in the present invention is determined from a value obtained by measuring the contents of Si and Al in a sample using an ICP (plasma emission spectroscopic analysis) apparatus.
- the average particle diameter when observed with an electron microscope is the average value of the diameters of 30 particles randomly selected by observing the synthesized zeolite dry powder with a scanning electron microscope (SEM). is there.
- the particle diameter was the ferret diameter that determined the direction.
- the ⁇ -type zeolite of the present invention has a crystallite size (after SDA is removed by calcination) before hydrothermal durability treatment of 20 nm or more, and particularly preferably 25 nm or more.
- the ⁇ -type zeolite of the present invention has a crystallite diameter reduction rate of less than 10% before and after thermal endurance treatment, and is preferably 5% or less.
- the hydrothermal durability treatment referred to in the present invention is a heat treatment at 700 ° C. for 20 hours under an air flow containing 10% by volume of water vapor.
- the hydrothermal durability treatment conditions in the present invention are general as the hydrothermal durability treatment conditions for zeolite, and are not particularly special.
- the thermal damage to zeolite not only in ⁇ -type zeolite but also at 600 ° C. or higher increases exponentially, and the hydrothermal durability treatment of the present invention is a treatment at 650 ° C. for 100 to 200 hours or longer, 800 ° C. This corresponds to several hours of processing.
- the ⁇ -type zeolite of the present invention changes in crystallite diameter by less than 10% before and after the hydrothermal durability treatment. This indicates that the crystal structure of the zeolite has not changed, and this seems to be the cause of high heat resistance.
- the change in crystallite diameter can be obtained by the following equation.
- the ⁇ -type zeolite of the present invention preferably has a low fluorine content, particularly 0.1% by weight or less, and more preferably does not contain fluorine. Even when fluorine is included, the change in crystallite diameter due to the hydrothermal durability treatment may be small, but the cause is not clear, but when used as an SCR catalyst, it may be inferior in low-temperature activity.
- the ⁇ -type zeolite of the present invention has a framework SiO 2 / Al 2 O 3 molar ratio (n) by 29 Si MAS NMR of 20 to less than 30 before hydrothermal durability treatment, and the framework SiO 2 / Al after hydrothermal durability treatment It is preferable that the 2 O 3 molar ratio (n ′) does not exceed 10 (n ′ ⁇ n + 10) than before the hydrothermal durability treatment.
- ⁇ -type zeolite of the present invention has high heat resistance, 29 Si MAS SiO 2 / Al 2 O 3 molar ratio before the hydrothermal durability treatment by NMR to (n), following hydrothermal aging SiO 2 / Al
- the 2 O 3 molar ratio (n ′) is preferably not more than 10 (n ′ ⁇ n + 10) and more preferably not more than 7.
- the ⁇ -type zeolite having a framework SiO 2 / Al 2 O 3 molar ratio increased by 10 or more before and after the hydrothermal durability treatment is easily deteriorated by dealumination by the hydrothermal durability treatment.
- the change in the framework SiO 2 / Al 2 O 3 molar ratio May be small.
- the crystallite diameter before hydrothermal durability treatment is less than 20 nm, or the framework SiO 2 / Al 2 O 3 molar ratio before hydrothermal durability treatment is 30 or more by 29 Si MAS NMR, or water
- the change in the crystallite size before and after the heat endurance treatment is 10% or more, and exhibits different physical properties from the ⁇ -type zeolite of the present invention.
- the skeleton SiO 2 / Al 2 O 3 molar ratio by 29 Si MAS NMR referred to in the present invention is determined by a general method in the art. As shown on page 61 of “Science and Engineering of Zeolite” (Kodansha, published in 2000), the following formula 1 is used.
- the Si (1Al) peak ie, Si having Al bound through oxygen and acting as a solid acid
- the Si (0Al) peak ie, oxygen
- ⁇ -type zeolite can basically be produced by hydrothermal synthesis in the presence of silica source, aluminum source, alkali, structure directing agent (SDA) and water, and is described in, for example, JP-A-6-287015. It can be manufactured according to the method.
- SDA structure directing agent
- Examples of the ratio of the raw material of the ⁇ -type zeolite of the present invention include the following ranges.
- a point different from the conventional one is that a secondary and / or tertiary alkylamine having 5 or more carbon atoms is used.
- Examples of secondary and / or tertiary alkylamines having 5 or more carbon atoms include ethyleneamine derivatives such as triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, N- (2-aminoethyl) piperazine, and Tosoh Corporation Or a tertiary amine catalyst (trade name: TOYOCAT) can be used.
- TOYOCAT that can be used include TOYOCAT-HPW (methylhydroxyethylpiperazine), TOYOCAT-ET (bis (dimethylaminoethyl) ether), TOYOCAT-DT (pentamethyldiethylenetriamine), TOYOCAT-NP (trimethylaminoethylpiperazine). ), TOYOCAT-TE (tetramethylethylenediamine) and the like.
- the crystallite size is larger than when no amine is added, and after drying, hydrothermal after SDA removal firing is 50 nm or more.
- a ⁇ -type zeolite having a very high heat resistance of 20 nm or more before the endurance treatment is obtained.
- the crystallite size after drying is preferably 70 nm or more.
- silica source sodium silicate aqueous solution, precipitated silica, colloidal silica, fumed silica, aluminosilicate gel, silicon alkoxide such as tetraethoxysilane, and the like can be used.
- the state of the aluminum source as a raw material is not particularly limited, and may be any state such as a simple metal, an aqueous solution, an oxide, a hydroxide, a chloride, a nitrate, or a sulfate.
- tetraethylammonium hydroxide having tetraethylammonium cation, tetraethylammonium chloride, tetraethylammonium bromide and the like can be used.
- Examples include bicyclo [3,2,1] octane cation. It is particularly preferable to use an aqueous solution of tetraethylammonium hydroxide.
- the ⁇ -type zeolite according to this patent can be obtained by crystallizing the raw material mixture having the above composition in an airtight pressure vessel at an arbitrary temperature of 100 to 180 ° C. for a sufficient time. After completion of crystallization, the mixture is allowed to cool, solid-liquid separation, washed with a sufficient amount of pure water, and dried at an arbitrary temperature of 100 to 150 ° C. Thereafter, the SDA is removed by calcination at an arbitrary temperature of 400 to 650 ° C. for 1 to 10 hours, whereby the ⁇ -type zeolite according to the present invention can be obtained.
- the ⁇ -type zeolite of the present invention can be used as an SCR catalyst that exhibits NOx decomposition performance by supporting an active metal such as iron or copper.
- the SCR catalyst of the present invention contains iron as a metal in the ⁇ -type zeolite of the present invention described above, and the skeleton SiO 2 / Al 2 O 3 molar ratio (m) by 29 Si MAS NMR is 15 or more before hydrothermal durability treatment. It is preferable that the skeleton SiO 2 / Al 2 O 3 molar ratio (m ′) after the hydrothermal durability treatment is 10 or less than that before the hydrothermal durability treatment.
- the ⁇ -type zeolite of the present invention has a skeleton SiO 2 / Al 2 O 3 molar ratio (n) by 29 Si MAS NMR of 20 or more and less than 30 (before hydrothermal durability treatment), but is observed by NMR by supporting a metal.
- the molar ratio is 1 to 10 lower than that before loading (before hydrothermal durability treatment).
- the SCR catalyst of the present invention has a skeleton SiO 2 / Al 2 O 3 molar ratio (m) of 15 or more and 25 or less (20 or more before loading) because it decreases by about 4 to 5%. Less than 30).
- the decrease in the molar ratio of the skeleton SiO 2 / Al 2 O 3 by 29 Si MAS NMR due to iron loading is caused by the overall decrease in the Si peak intensity due to the influence of the spin interaction between Si and Fe. It occurs regardless of the heat resistance of the ⁇ -type zeolite.
- the framework SiO 2 / Al 2 O 3 molar ratio (m ′) by 29 Si MAS NMR after the hydrothermal durability treatment is larger than that before the hydrothermal durability treatment (m).
- the tendency is different from that of ⁇ -type zeolite itself. That is, in the SCR catalyst supporting iron, the higher the hydrothermal durability, the greater the increase in the skeleton SiO 2 / Al 2 O 3 molar ratio by 29 Si MAS NMR after the hydrothermal durability treatment.
- the post-hydrothermal durability treatment (m ′) is preferably more than 10 (m ′> m + 10), more preferably more than 15 (m ′> m + 15) than before (m).
- the presence of Fe reduces the Si peak area of 29 Si MAS NMR, but the magnitude of the spin interaction is inversely proportional to the distance between atoms, so the peak area is greatly reduced when iron is contained. This shows that the distance between Fe and Si is closer.
- iron aggregates deteriorates as catalytic activity
- hydrothermal durability treatment the NMR absorption spectrum of Si in the vicinity where such iron exists increases. Since the SCR reaction proceeds by the action of acid sites and metals, it is mainly metal atoms adjacent to the acid sites that contribute to catalytic activity. That is, the active iron species is not Si (0Al) but is present in the vicinity of Si (1Al).
- iron aggregation hardly occurs in the vicinity of Si (1Al) (that is, non-aggregated iron that contributes to catalytic activity even after hydrothermal durability treatment is Si ( 1 Al), and only occurs around Si (0Al). Therefore, only the peak area of Si (0Al) in the equation (1) is increased by the hydrothermal durability treatment, and the peak area of Si (1Al) is relatively decreased.
- the change in the molar ratio of the skeleton SiO 2 / Al 2 O 3 by NMR is an indicator of whether dealumination has occurred, but the absorption of the NMR spectrum
- the change in the skeletal SiO 2 / Al 2 O 3 molar ratio by NMR indicates the state of iron in the vicinity of Si (1Al) affecting the catalytic activity (presence of aggregation) It can be an indicator.
- the SCR catalyst of the present invention contains iron as a metal, and the skeleton SiO 2 / Al 2 O 3 molar ratio (m) by 29 Si MAS NMR is 15 or more and 25 or less before hydrothermal durability treatment, and hydrothermal durability.
- the skeleton SiO 2 / Al 2 O 3 molar ratio (m ′) after the treatment is preferably more than 30 and 50 or less, particularly 35 or more.
- the ⁇ -type zeolite of the present invention can be used as an SCR catalyst having a NOx reduction rate of 40% or more at 200 ° C. after hydrothermal durability treatment.
- the NOx (nitrogen oxide) reduction rate of the SCR catalyst in the present invention is a mixed gas (200 ppm each) of nitric oxide and ammonia, 10% by volume of oxygen, 1.5 liters of the processing gas by the remaining nitrogen gas. This is defined as the NOx reduction rate when contacted with the catalyst at a processing gas / catalyst capacity ratio of 1000 / min.
- the NOx reduction condition of the present invention is a category of general conditions for evaluating the NOx reducing ability of the SCR catalyst, and is not particularly special.
- the SCR catalyst of the present invention is composed of ⁇ -type zeolite and group 8 to 11 elements of the periodic table, that is, iron, cobalt, nickel, copper, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold, It carries at least one metal selected from Preferably, one or more selected from the group consisting of iron, cobalt, palladium, iridium, platinum, copper, silver, and gold, more preferably those carrying iron and / or copper. Further, a promoter component such as rare earth metal, titanium or zirconia can be additionally added.
- the method for supporting the active metal species is not particularly limited, and an ion exchange method, an impregnation supporting method, an evaporation to dryness method, a precipitation supporting method, a physical mixing method, and the like can be employed.
- the raw materials used for supporting the metal may be any of soluble / insoluble materials such as nitrates, sulfates, acetates, chlorides, complex salts, oxides and complex oxides.
- the amount of metal supported is not limited, but is preferably in the range of 0.1 to 10% by weight, particularly 1 to 7%.
- the SCR catalyst of the present invention can be used after being mixed with a binder such as silica, alumina and clay mineral.
- a binder such as silica, alumina and clay mineral.
- clay minerals used for molding include kaolin, attapulgite, montmorillonite, bentonite, allophane, and sepiolite.
- the SCR catalyst of the present invention can be purified by contacting the exhaust gas containing nitrogen oxides.
- nitrogen oxides purified in the present invention include nitric oxide, nitrogen dioxide, dinitrogen trioxide, dinitrogen tetroxide, dinitrogen monoxide, and mixtures thereof. Nitric oxide, nitrogen dioxide, and dinitrogen monoxide are preferred.
- the nitrogen oxide concentration of the exhaust gas that can be treated by the present invention is not limited.
- the exhaust gas may contain components other than nitrogen oxides, and may contain, for example, hydrocarbons, carbon monoxide, carbon dioxide, hydrogen, nitrogen, oxygen, sulfur oxides, and water.
- the method of the present invention can purify nitrogen oxides from a wide variety of exhaust gases such as diesel vehicles, gasoline vehicles, boilers, gas turbines and the like.
- the SCR catalyst of the present invention purifies nitrogen oxides in the presence of a reducing agent.
- hydrocarbons, carbon monoxide, hydrogen and the like contained in the exhaust gas can be used as the reducing agent, and further, an appropriate reducing agent is added to the exhaust gas and used together.
- the reducing agent added to the exhaust gas is not particularly limited, and examples thereof include ammonia, urea, organic amines, hydrocarbons, alcohols, ketones, carbon monoxide, hydrogen, and the like, particularly improving the purification efficiency of nitrogen oxides.
- ammonia, urea and organic amines are used.
- the addition method of these reducing agents is not particularly limited, and a method of directly adding the reducing component in a gaseous state, a method of spraying and vaporizing a liquid such as an aqueous solution, a method of spraying thermal decomposition, and the like can be employed.
- the addition amount of these reducing agents can be arbitrarily set so that nitrogen oxides can be sufficiently purified.
- the space velocity at the time of contacting the SCR catalyst and the exhaust gas is not particularly limited, but the preferred space velocity is 500 to 500,000 hr ⁇ 1 , more preferably 2000 to 300,000 on a volume basis. hr -1 .
- Example 1 Tetraethylorthosilicate, aluminum isopropoxide, tetraethylammonium hydroxide (hereinafter TEAOH) aqueous solution, and amine (pentamethyldiethylenetriamine, TOYOCAT-DT manufactured by Tosoh Corporation) were mixed and ethanol was evaporated by stirring at room temperature. Water and seed crystals (Tosoh HSZ930NHA) were added, and the composition of the reaction mixture was SiO 2 : 0.034Al 2 O 3 : 0.16 TEAOH: 0.3 amine: 10H 2 O. The reaction mixture was sealed in a stainless steel autoclave and heated at 150 ° C. with stirring to cause crystallization.
- TEAOH tetraethylammonium hydroxide
- the slurry mixture after crystallization was subjected to solid-liquid separation, washed with a sufficient amount of pure water, and dried at 110 ° C.
- the dry powder was calcined at 600 ° C. for 2 hours to obtain ⁇ -type zeolite.
- Example 2 Amorphous silica powder (manufactured by Tosoh Silica, product name NipSeal VM-3), aluminum hydroxide, TEAOH aqueous solution, sodium hydroxide aqueous solution, amine (bis (dimethylaminoethyl) ether, Tosoh Corporation TOYOCAT-ET), water, A seed crystal ( ⁇ type zeolite manufactured by Tosoh Corporation, product name HSZ930NHA) was added, and the mixture was sufficiently stirred and mixed.
- the molar composition of the reaction mixture was SiO 2 : 0.03Al 2 O 3 : 0.20 TEAOH: 0.05 NaOH: 0.3 amine: 10H 2 O.
- the reaction mixture was sealed in a stainless steel autoclave and heated at 150 ° C. with stirring to cause crystallization.
- the slurry mixture after crystallization was subjected to solid-liquid separation, washed with a sufficient amount of pure water, and dried at 110 ° C.
- the dry powder was calcined at 550 ° C. for 2 hours to obtain ⁇ -type zeolite.
- Example 3 A granular amorphous aluminosilicate was obtained by mixing a sodium silicate aqueous solution and an aluminum sulfate aqueous solution.
- the amorphous aluminosilicate, TEAOH aqueous solution, sodium hydroxide aqueous solution, amine (tetraethylenepentamine), water, seed crystal ( ⁇ -type zeolite manufactured by Tosoh Corporation, product name HSZ930NHA) were added and mixed thoroughly.
- the molar composition of the reaction mixture was SiO 2 : 0.03Al 2 O 3 : 0.20 TEAOH: 0.05 NaOH: 0.3 amine: 10H 2 O.
- the reaction mixture was sealed in a stainless steel autoclave and heated at 150 ° C. with stirring to cause crystallization.
- the slurry mixture after crystallization was subjected to solid-liquid separation, washed with a sufficient amount of pure water, and dried at 110 ° C.
- the dry powder was calcined at 550 ° C. for 2 hours to obtain ⁇ -type zeolite.
- Example 4 A granular amorphous aluminosilicate was obtained by mixing a sodium silicate aqueous solution and an aluminum sulfate aqueous solution.
- the amorphous aluminosilicate, TEAOH aqueous solution, potassium hydroxide aqueous solution, amine (triethylenetetramine), water, seed crystal ( ⁇ -type zeolite manufactured by Tosoh Corporation, product name HSZ930NHA) were added and mixed thoroughly.
- the molar composition of the reaction mixture was SiO 2 : 0.03Al 2 O 3 : 0.14 TEAOH: 0.05 KOH: 0.3 amine: 10H 2 O.
- the reaction mixture was sealed in a stainless steel autoclave and heated at 150 ° C.
- Example 1 According to Example 1 of Japanese Patent Application Laid-Open No. 2008-81348, a granular amorphous aluminosilicate was obtained using a sodium silicate aqueous solution and an aluminum sulfate aqueous solution. Next, the reaction mixture was mixed so that the composition was SiO 2 : 0.05Al 2 O 3 : 0.67TEAF: 11H 2 O, and 0.36 parts of seed crystals (Tosoh) were further added to 100 parts of the composition.
- ⁇ -type zeolite (trade name: HSZ940NHA) was added and crystallized by heating in an autoclave at 155 ° C. with stirring. The slurry after crystallization was washed and dried at 110 ° C. (TEAF: Tetrahydroxide hydroxide) The dry powder was calcined at 600 ° C. for 2 hours to obtain ⁇ -type zeolite. The F content was 0.17%.
- Comparative Example 2 According to Example 3 of Japanese Patent Application Laid-Open No. 2008-81348, a granular amorphous aluminosilicate was obtained using a sodium silicate aqueous solution and an aluminum sulfate aqueous solution. Comparative Example, except that the composition of the reaction mixture was SiO 2 : 0.034Al 2 O 3 : 0.30TEAOH: 0.10KOH: 9.9H 2 O, the synthesis temperature was 150 ° C., and HSZ930NHA made by Tosoh was used as a seed crystal. The same treatment as in No. 1 was performed.
- Comparative Example 3 According to Example 5 of Japanese Patent Application Laid-Open No. 2008-81348, a granular amorphous aluminosilicate was obtained using a sodium silicate aqueous solution and an aluminum sulfate aqueous solution. Comparative Example, except that the composition of the reaction mixture was SiO 2 : 0.034Al 2 O 3 : 0.07TEABr: 0.13TEAOH: 9.9H 2 O, the synthesis temperature was 150 ° C., and Tosoh HSZ930NHA was used as the seed crystal. The same treatment as in No. 1 (TEABr: tetraethylammonium bromide) was performed.
- TEABr tetraethylammonium bromide
- Comparative Example 4 According to Example 7 of Japanese Patent Application Laid-Open No. 2008-81348, tetraethylorthosilicate, aluminum isopropoxide and TEAOH were mixed and ethanol was evaporated by stirring at room temperature. Water and seed crystals were added, and the composition of the reaction mixture was SiO 2 : 0.034Al 2 O 3 : 0.16TEAOH: 10H 2 O. The same treatment as in Comparative Example 1 was performed except that the synthesis temperature was 150 ° C. and Tosoh HSZ930NHA was used as a seed crystal.
- Example 7 According to Example 6 of US Pat. No. 3,308,069, NaAlO 2 , water, amorphous silica powder (product name: Nipsil VM-3, manufactured by Tosoh Silica), TEAOH aqueous solution were used, and seed crystals were not used.
- the composition of the reaction mixture was SiO 2 : 0.025Al 2 O 3 : 0.62 TEAOH: 0.1NaOH: 20H 2 O.
- the reaction mixture was sealed in a stainless steel autoclave and heated at 150 ° C. with stirring to cause crystallization.
- the slurry mixture after crystallization was subjected to solid-liquid separation, washed with a sufficient amount of pure water, and dried at 110 ° C.
- the dry powder was calcined at 600 ° C. for 2 hours to obtain ⁇ -type zeolite.
- Comparative Example 8 The same treatment as in Comparative Example 7 was performed except that the composition of the reaction mixture was changed to SiO 2 : 0.02Al 2 O 3 : 0.62TEAOH: 0.1NaOH: 20H 2 O.
- the dried product is a value after baking after drying at 110 ° C. and before hydrothermal durability treatment.
- the skeleton SiO 2 / Al 2 O 3 molar ratio by 29 Si MAS NMR is as shown in Table 1.
- Table 1 the relative value of the peak area of Si (1Al) (iron Before loading: After iron loading), before hydrothermal durability treatment, Example 1 was 10: 7 and Comparative Example 2 was 10: 8, whereas after hydrothermal durability treatment, Example 1 was 10 : 7 and Comparative Example 2 is 10:10.
- the relative value of the peak area of Si (0Al) (before iron loading: after iron loading) was 10: 5 in Example 1 and 10: 6 in Comparative Example 2 before hydrothermal durability treatment.
- Example 1 After the hydrothermal durability treatment, Example 1 is 10: 9 and Comparative Example 2 is 10: 8. In both catalysts, recovery of the peak area considered to be accompanied by iron aggregation is observed, but the tendency is opposite to that of the Si (1Al) peak area. That is, it can be interpreted that Example 1 has a larger agglomeration of iron in the vicinity of Si (0Al). It is not known why the aggregation of iron is not suppressed as a whole but only in the vicinity of Si (1Al), but it is mainly adjacent to the acid point that contributes to the SCR catalytic activity. Since it is considered to be a metal atom, it can be understood that the ⁇ -type zeolite of Example 1 in which iron agglomeration in the vicinity of Si (1Al) is suppressed showed higher catalytic performance.
- SCR catalyst performance evaluation An SCR catalyst having 3 wt% Fe metal supported on ⁇ -type zeolite was subjected to hydrothermal durability treatment, and the SCR catalyst was evaluated. The results are shown in Table 2.
- the SCR catalyst using the ⁇ -type zeolite of the present invention showed higher NOx reduction performance after hydrothermal durability treatment than when the ⁇ zeolite of the comparative example was used.
- the SCR catalyst using the ⁇ -type zeolite is also excellent in hydrothermal durability, particularly excellent in NOx reduction at a low temperature. It has high performance as a NOx removal catalyst contained in exhaust gas from automobiles. Therefore, the industrial value of the present invention is remarkable.
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Abstract
Description
耐熱性を向上させるためには、SiO2/Al2O3モル比を高める方法(特許文献2)、高温でゼオライトを処理する方法(特許文献3)、結晶子径を大きくする方法(特許文献4~6)、フッ素を用いる方法(特許文献7)などが知られている。
β型ゼオライトの製造法としては、テトラエチルアンモニウムカチオン以外に3級アルカノールアミンを加えて合成することによって、0.1~3μmの大きな結晶サイズのβ型ゼオライトを合成する方法が開示されている(特許文献9)。しかし、その様な方法で製造されたβゼオライトは水熱耐久性に優れるものではなかった。
(1) SiO2/Al2O3モル比が20以上30未満であり、水熱耐久処理前の結晶子径が20nm以上、水熱耐久処理前後の結晶子の変化が10%未満であり、且つ、フッ素の含有量が0.1重量%以下であるβ型ゼオライト。
(2) 29Si MAS NMRによる骨格SiO2/Al2O3モル比(n)が水熱耐久処理前に20以上30未満、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(n’)が水熱耐久処理前より10を超えない(n’<n+10)ことを特徴とする(1)に記載のβ型ゼオライト。
(3) 電子顕微鏡で観察した時の平均粒子径が0.35~0.50μmである(1)又は(2)に記載のβ型ゼオライト。
(4) 炭素数5以上の2級及び/又は3級アルキルアミンを含んでなる反応液から結晶化する(1)乃至(3)のいずれかに記載のβ型ゼオライトの製造方法。
(5) (1)乃至(3)のいずれかに記載のβ型ゼオライトに周期律表の8~11族の元素群から選ばれる少なくとも一種の金属を含んでなるSCR触媒。
(6) 周期律表の8~11族の元素群から選ばれる少なくとも一種の金属が鉄及び/又は銅を含んでなる(5)に記載のSCR触媒。
(7) 金属として鉄を含有し、29Si MAS NMRによる骨格SiO2/Al2O3モル比(m)が水熱耐久処理前に15以上25以下、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(m’)が水熱耐久処理前より10を超える(m’>m+10)ことを特徴とする(5)又は(6)に記載のSCR触媒。
(8) 金属として鉄を含有し、29Si MAS NMRによる骨格SiO2/Al2O3モル比(m)が水熱耐久処理前に15以上25以下、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(m’)が30を超え50以下である(7)に記載のSCR触媒。
(9) 水熱耐久処理後の200℃でのNOx還元率が40%以上である(5)乃至(8)のいずれかに記載のSCR触媒。
本発明でいうSiO2/Al2O3モル比は、ICP(プラズマ発光分光分析)装置を用い、試料中のSiとAlの含量を測定して、その値から求める。
本発明のβ型ゼオライトは、その結晶子径(SDAを焼成除去後)の水熱耐久処理前で20nm以上であり、特に25nm以上であることが好ましい。
β2 2=βM 2-βO 2
β1=β2×π/180
K:定数(0.9)
λ:X線の波長(0.15418nm)
θ:回折角の1/2
β1:装置補正後の(302)結晶面ピークの半値幅(rad)
β2:装置補正後の(302)結晶面ピークの半値幅(°)
βM:(302)結晶面ピークの半値幅実測値(°)
βO:標準物質であるSiO2から求めた装置補正値(°)
本発明でいうところの水熱耐久処理は、水蒸気を10容量%含む空気流通下における700℃で20時間の加熱処理である。本発明での水熱耐久処理条件はゼオライトの水熱耐久処理条件として一般的なものであり、特に特殊なものではない。なお、β型ゼオライトに限らず、600℃以上におけるゼオライトに対する熱的なダメージは指数関数的に増大し、本発明の水熱耐久処理は、650℃での100~200時間以上の処理、800℃での数時間の処理に相当するものである。
結晶子径の変化は、下式で求められる。
={1-(水熱耐久処理後の結晶子径/水熱耐久処理前の結晶子径)}×100・・・(2)
化学分析によるSiO2/Al2O3モル比では結晶構造から脱アルミしたものも成分として認知されるが、29Si MAS NMRでは結晶中の骨格SiO2/Al2O3モル比を測定することが出来るため、ゼオライトの耐熱性を評価する上で29Si MAS NMRは有効な手段である。
本発明のβ型ゼオライトは耐熱性が高いものであり、29Si MAS NMRによる水熱耐久処理前のSiO2/Al2O3モル比(n)に対し、水熱耐久処理後SiO2/Al2O3モル比(n’)はnより10を超えない(n’<n+10)ものが好ましく、特に7を超えないことが好ましい。水熱耐久処理前後で骨格SiO2/Al2O3モル比が10以上増大するβ型ゼオライトは、水熱耐久処理によって脱アルミによって劣化し易いものである。
Si(nAl):酸素を介して結合しているAlの数がn個のSi
β型ゼオライトは、基本的にはシリカ源、アルミ源、アルカリ、構造指向剤(SDA)、水の存在下、水熱合成によって製造することができ、例えば日本国特開平6-287015に記載された方法に従って製造できる。本発明のβ型ゼオライトの原料の比率としては以下の範囲が例示できる。
アルカリ/SiO2モル比 0~ 1
H2O/SiO2モル比 7~15
SDA/SiO2モル比 0.05~0.3
(炭素数5以上の2級/3級アルキルアミン)/SiO2モル比 0.01~1.0
温度:700℃
時間:20時間
ガス中水分濃度:10容量%
ガス流量/ゼオライト容量比:100倍/分
<X線回折装置の測定条件>
装置:マックサイエンス社製MXP3VII
X線源:CuKα=1.5405オングストローム
加速電圧:40kV
管電流:30mA
走査速度:2θ=0.02deg/sec
サンプリング間隔:0.02deg
発散スリット:1deg
散乱スリット:1deg
受光スリット:0.3mm
モノクロメータ使用
ゴニオ半径:185mm
装置:Varian NMRS-400
前処理:相対湿度80%にて一晩水和処理
共鳴周波数:79.4MHz
パルス幅:π/6
測定待ち時間:10秒
積算回数:1500回
回転周波数:10.0kHz
シフト標準:TMS
鉄の含有量によってピーク強度に変化が生じることが考えられる。異なる条件での比較を避けるため、29Si MAS NMRの測定においてはFe金属の含有量は2~3wt%とする。
処理ガス組成 NO 200ppm
NH3 200ppm
O2 10vol%
H2O 3vol%
残り 窒素バランス
処理ガス流量 1.5リットル/分
処理ガス/触媒容量比 1000/分
テトラエチルオルトシリケート、アルミニウムイソプロポキシド、水酸化テトラエチルアンモニウム(以下TEAOH)水溶液、アミン(ペンタメチルジエチレントリアミン、東ソー株式会社製TOYOCAT-DT)を混合し、室温で撹拌することでエタノールを蒸発させた。水と種晶(東ソー製HSZ930NHA)を加え、反応混合物の組成を、SiO2:0.034Al2O3:0.16TEAOH:0.3アミン:10H2Oとした。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、600℃で2時間焼成し、β型ゼオライトを得た。
無定形シリカ粉末(東ソーシリカ製、製品名ニップシールVM-3)、水酸化アルミニウム、TEAOH水溶液、水酸化ナトリウム水溶液、アミン(ビス(ジメチルアミノエチル)エーテル、東ソー株式会社製TOYOCAT-ET)、水、種晶(東ソー株式会社製β型ゼオライト、製品名HSZ930NHA)を加え、十分に攪拌混合した。反応混合物のモル組成は、SiO2:0.03Al2O3:0.20TEAOH:0.05NaOH:0.3アミン:10H2Oであった。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、550℃で2時間焼成し、β型ゼオライトを得た。
珪酸ソーダ水溶液、硫酸アルミニウム水溶液を混合して粒状無定形アルミノケイ酸塩を得た。該無定形アルミノケイ酸塩、TEAOH水溶液、水酸化ナトリウム水溶液、アミン(テトラエチレンペンタミン)、水、種晶(東ソー株式会社製β型ゼオライト、製品名HSZ930NHA)を加え、十分に攪拌混合した。反応混合物のモル組成は、SiO2:0.03Al2O3:0.20TEAOH:0.05NaOH:0.3アミン:10H2Oであった。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、550℃で2時間焼成し、β型ゼオライトを得た。
珪酸ソーダ水溶液、硫酸アルミニウム水溶液を混合して粒状無定形アルミノケイ酸塩を得た。該無定形アルミノケイ酸塩、TEAOH水溶液、水酸化カリウム水溶液、アミン(トリエチレンテトラミン)、水、種晶(東ソー株式会社製β型ゼオライト、製品名HSZ930NHA)を加え、十分に攪拌混合した。反応混合物のモル組成は、SiO2:0.03Al2O3:0.14TEAOH:0.05KOH:0.3アミン:10H2Oであった。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、550℃で2時間焼成し、β型ゼオライトを得た。
日本国特開2008-81348号の実施例1に従い、珪酸ソーダ水溶液、硫酸アルミニウム水溶液を用い粒状無定型アルミノ珪酸塩を得た。次に反応混合物の組成が、SiO2:0.05Al2O3:0.67TEAF:11H2Oとなるように混合し、さらに当該組成物100部に対して0.36部の種晶(東ソー株式会社製β型ゼオライト:商品名HSZ940NHA)を加え、オートクレーブ中、155℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリーは、洗浄し、110℃で乾燥した。(TEAF:水酸化テトラエチルフルオライド)当該乾燥粉末を、600℃で2時間焼成し、β型ゼオライトを得た。F含有量は0.17%であった。
日本国特開2008-81348号の実施例3に従い、珪酸ソーダ水溶液、硫酸アルミニウム水溶液を用い粒状無定型アルミノ珪酸塩を得た。反応混合物の組成を、SiO2:0.034Al2O3:0.30TEAOH:0.10KOH:9.9H2Oとし、合成温度を150℃、種晶に東ソー製HSZ930NHAを用いた以外は比較例1と同様の処理をした。
日本国特開2008-81348号の実施例5に従い、珪酸ソーダ水溶液、硫酸アルミニウム水溶液を用い粒状無定型アルミノ珪酸塩を得た。反応混合物の組成を、SiO2:0.034Al2O3:0.07TEABr:0.13TEAOH:9.9H2Oとし、合成温度を150℃、種晶に東ソー製HSZ930NHAを用いた以外は比較例1と同様の処理をした(TEABr:臭化テトラエチルアンモニウム)。
日本国特開2008-81348号の実施例7に従い、テトラエチルオルトシリケート、アルミニウムイソプロポキシド、TEAOHを混合し、室温で撹拌することでエタノールを蒸発させた。水と種晶を加え、反応混合物の組成を、SiO2:0.034Al2O3:0.16TEAOH:10H2Oとした。合成温度を150℃、種晶に東ソー製HSZ930NHAを用いた以外は比較例1と同様の処理をした。
テトラエチルオルトシリケート、アルミニウムイソプロポキシド、TEAOH水溶液、アミン(トリエタノールアミン)を混合し、室温で撹拌することでエタノールを蒸発させた。水と種晶(東ソー製HSZ930NHA)を加え、反応混合物の組成を、SiO2:0.034Al2O3:0.16TEAOH:0.3アミン:10H2Oとした。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、600℃で2時間焼成し、β型ゼオライトを得た。
テトラエチルオルトシリケート、アルミニウムイソプロポキシド、TEAOH水溶液、アミン(ジエチレントリアミン)を混合し、室温で撹拌することでエタノールを蒸発させた。水と種晶(東ソー製HSZ930NHA)を加え、反応混合物の組成を、SiO2:0.034Al2O3:0.16TEAOH:0.3アミン:10H2Oとした。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、600℃で2時間焼成し、β型ゼオライトを得た。
米国特許3308069号の実施例6に従い、NaAlO2、水、無定形シリカ粉末(東ソーシリカ製、製品名ニップシールVM-3)、TEAOH水溶液を用い、種晶は用いなかった。反応混合物の組成は、SiO2:0.025Al2O3:0.62TEAOH:0.1NaOH:20H2Oであった。この反応混合物をステンレス製オートクレーブに密閉し、150℃で攪拌しながら加熱して結晶化させた。結晶化後のスラリー状混合物を固液分離し、十分量の純水で洗浄し、110℃で乾燥した。当該乾燥粉末を、600℃で2時間焼成し、β型ゼオライトを得た。
反応混合物の組成を、SiO2:0.02Al2O3:0.62TEAOH:0.1NaOH:20H2Oとした以外は、比較例7と同様の処理をした。
実施例、比較例のβ型ゼオライトそれぞれにFe(NO3)3・9水和物の水溶液を用いてFe金属を3重量%担持し、500℃で空気焼成した。
各図面において、符号1は水熱耐久処理前の29Si MAS NMRスペクトルを示し、符号2は水熱耐久処理後の29Si MAS NMRスペクトルを示す。なお図1から図4の縦軸の縮尺は全て同じである。
β型ゼオライトにFe金属を3重量%担持したSCR触媒を水熱耐久処理し、SCR触媒評価を行った。結果を表2に示す。
2:水熱耐久処理後
Claims (9)
- SiO2/Al2O3モル比が20以上30未満であり、水熱耐久処理前の結晶子径が20nm以上、水熱耐久処理前後の結晶子の変化が10%未満であり、且つ、フッ素の含有量が0.1重量%以下であるβ型ゼオライト。
- 29Si MAS NMRによる骨格SiO2/Al2O3モル比(n)が水熱耐久処理前に20以上30未満、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(n’)が水熱耐久処理前より10を超えない(n’<n+10)ことを特徴とする請求項1に記載のβ型ゼオライト。
- 電子顕微鏡で観察した時の平均粒子径が0.35~0.50μmである請求項1又は請求項2に記載のβ型ゼオライト。
- 炭素数5以上の2級及び/又は3級アルキルアミンを含んでなる反応液から結晶化する請求項1乃至請求項3のいずれかに記載のβ型ゼオライトの製造方法。
- 請求項1乃至請求項3のいずれかに記載のβ型ゼオライトに周期律表の8~11族の元素群から選ばれる少なくとも一種の金属を含んでなるSCR触媒。
- 周期律表の8~11族の元素群から選ばれる少なくとも一種の金属が鉄及び/又は銅を含んでなる請求項5に記載のSCR触媒。
- 金属として鉄を含有し、29Si MAS NMRによる骨格SiO2/Al2O3モル比(m)が水熱耐久処理前に15以上25以下、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(m’)が水熱耐久処理前より10を超える(m’>m+10)ことを特徴とする請求項5又は請求項6に記載のSCR触媒。
- 金属として鉄を含有し、29Si MAS NMRによる骨格SiO2/Al2O3モル比(m)が水熱耐久処理前に15以上25以下、なおかつ水熱耐久処理後の骨格SiO2/Al2O3モル比(m’)が30を超え50以下である請求項7に記載のSCR触媒。
- 水熱耐久処理後の200℃でのNOx還元率が40%以上である請求項5乃至請求項8のいずれかに記載のSCR触媒。
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Cited By (3)
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JP2015205277A (ja) * | 2010-05-21 | 2015-11-19 | ピーキュー コーポレイション | NOx還元のための新規の金属含有ゼオライトベータ |
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WO2021065577A1 (ja) | 2019-10-03 | 2021-04-08 | エヌ・イーケムキャット株式会社 | 排ガス浄化装置 |
Also Published As
Publication number | Publication date |
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US8722560B2 (en) | 2014-05-13 |
CN102123946B (zh) | 2013-12-04 |
CN102123946A (zh) | 2011-07-13 |
EP2314544A4 (en) | 2011-11-09 |
US20110136657A1 (en) | 2011-06-09 |
EP2314544A1 (en) | 2011-04-27 |
KR20110056490A (ko) | 2011-05-30 |
JP5549839B2 (ja) | 2014-07-16 |
KR101507204B1 (ko) | 2015-03-30 |
JP2010070450A (ja) | 2010-04-02 |
EP2314544B1 (en) | 2023-06-28 |
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