CN102921403A - Method for preparing V2O5-WO3/TiO2 powder for making denitration catalyst - Google Patents
Method for preparing V2O5-WO3/TiO2 powder for making denitration catalyst Download PDFInfo
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- CN102921403A CN102921403A CN2012103319819A CN201210331981A CN102921403A CN 102921403 A CN102921403 A CN 102921403A CN 2012103319819 A CN2012103319819 A CN 2012103319819A CN 201210331981 A CN201210331981 A CN 201210331981A CN 102921403 A CN102921403 A CN 102921403A
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 239000003054 catalyst Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 27
- 239000000843 powder Substances 0.000 title claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000012065 filter cake Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000001354 calcination Methods 0.000 claims abstract description 24
- 238000005406 washing Methods 0.000 claims abstract description 22
- 239000002253 acid Substances 0.000 claims abstract description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 235000011121 sodium hydroxide Nutrition 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 45
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 34
- 238000002803 maceration Methods 0.000 claims description 25
- 238000002360 preparation method Methods 0.000 claims description 23
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 15
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 15
- 235000006408 oxalic acid Nutrition 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 235000010215 titanium dioxide Nutrition 0.000 claims description 12
- 238000010009 beating Methods 0.000 claims description 11
- 239000013067 intermediate product Substances 0.000 claims description 11
- 239000000706 filtrate Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract 2
- 238000005470 impregnation Methods 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 238000005303 weighing Methods 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- NWJUARNXABNMDW-UHFFFAOYSA-N tungsten vanadium Chemical compound [W]=[V] NWJUARNXABNMDW-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-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 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- NIAGBSSWEZDNMT-UHFFFAOYSA-M tetraoxidosulfate(.1-) Chemical compound [O]S([O-])(=O)=O NIAGBSSWEZDNMT-UHFFFAOYSA-M 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- WKXHZKXPFJNBIY-UHFFFAOYSA-N titanium tungsten vanadium Chemical class [Ti][W][V] WKXHZKXPFJNBIY-UHFFFAOYSA-N 0.000 description 1
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Inorganic Compounds Of Heavy Metals (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a V2O5-WO3/TiO2powder for making a denitration catalyst, which comprises the following steps of: 1) making metatitanic acid into pulp at a concentration of 280 to 320g/L based on TiO2, heating the pulp to 60 DEG C, regulating the pH value to 5.0 with caustic soda, regulating the pH value to 5.5 to 5.7 with ammonia water, and filtering the pulp by pressure and washing the filter cake by water; 2) preparing an impregnation solution; 3) making the filter cake made by the step 1) into pulp at a concentration of 280 to 320g/L based on TiO2, heating to 60 DEG C, adding the pulp into the impregnation solution obtained by the step 2), stirring the mixture for 2 to 4 hours, and filtering the solution by pressure; 4) calcining the filter cake obtained by the step 3) at 400 to 550 DEG C for 2 to 5h; and 5) crushing the calcined material obtained by the step 4).
Description
Technical field
The present invention relates to a kind of denitrating catalyst V
2O
5-WO
3/ TiO
2The preparation method of powder.
Background technology
The flue gas that coal combustion generates is the nitrogen oxide as leading take nitric oxide and nitrogen dioxide, and it is the major reason that forms photochemical fog and acid rain, also is a kind of important greenhouse gases simultaneously.So, in by the end of July, 2011 country put into effect " thermal power plant's air pollution emission standard ", the nitrogen oxide emission of all newly-built fired power generating unit must not surpass 100mg/m after this standard-required 2012
3, the nitrogen oxide emission of all fired power generating unit of key area must not surpass 100mg/m after 2014
3, non-key area must not surpass 200mg/m
3, therefore, it is the instant task of environmental protection that the denitration of flue gas is administered.The SCR(SCR) gas denitrifying technology is the effective technology of the solution Pollution Index in Air Nitric Oxides that generally adopts in the world at present.Under the effect of catalyst, by reducing agents such as ammonia, urea, nitrous oxides selectivity harmful in the flue gas is catalysed and reduced into clean harmless nitrogen G﹠W, its denitration efficiency can reach more than 90%.The key of this technology and core are exactly denitrating catalyst.
Denitrating catalyst is take nano titanium oxide as carrier, and active component vanadic anhydride and co-catalyst tungstic acid in the load have been reported many about WO at present
3-TiO
2The preparation of composite granule, but about V
2O
5-WO
3/ TiO
2Composite granule also rarely have report.This vanadium titanium tungsten composite powder is with active component V
2O
5With the even combination of carrier, avoided adding the inhomogeneous phenomenon of fashionable mixing at moulding process in advance, can bring into play better V
2O
5Catalytic activity.
Summary of the invention
The objective of the invention is to provide a kind of denitrating catalyst V
2O
5-WO
3/ TiO
2The preparation method of powder.
Technical scheme of the present invention is: a kind of denitrating catalyst V
2O
5-WO
3/ TiO
2The preparation method of powder, draw together following steps:
1) metatitanic acid is made slurries, concentration is with TiO
2Count 250-350g/L, be heated to 60 ℃, regulate its pH value to 4.0-5.0 with caustic soda, regulate the pH value to 5.0-6.0 with ammoniacal liquor again, then filter-press water-washing;
2) preparation maceration extract: oxalic acid is joined in 60 ℃ of water, stirring is dissolved oxalic acid fully, adds ammonium metatungstate again, stirs slowly to add ammonium metavanadate after ammonium metatungstate dissolves fully again, all add to leave standstill after the dissolving and be aged to color and no longer change ammonium metavanadate addition V
2O
5/ TiO
2=0.8-1.2: 88-94, ammonium metatungstate addition WO
3/ TiO
2=5-10: 88-94, the oxalic acid addition is 3 times of ammonium metavanadate quality;
3) the filter cake making beating that step 1) is obtained, concentration is with TiO
2Count 250-350g/L, be heated to 60 ℃, then add step 2) maceration extract that obtains, stir press filtration behind 2 ~ 4h;
4) filter cake that step 3) is obtained is at the lower calcining of 400-550 ℃ temperature 2-5h;
5) the calcining material that step 4) is obtained is pulverized.
Further, the metatitanic acid of step 1) is the intermediate product of Titanium White Production By Sulfuric Acid Process.
Further, the filtrate that obtains of step 3) is used for step 2) the preparation maceration extract.
The present invention uses NaOH to replace most of ammoniacal liquor, regulate metatitanic acid slip pH to 4.0-5.0 with NaOH first, be adjusted to 5.0-6.0 with a small amount of ammoniacal liquor again, and then washing is to remove sulfate radical and sodium ion free in the filter cake, the method can reduce the consumption of ammonia, reduce the ammonia-nitrogen content in the waste water, met the requirement of cleaner production.
Then adopt the method for dipping simultaneously the predecessor of vanadium tungsten to be combined with metatitanic acid, just be combined in equably titanium dioxide surface through vanadium tungsten component after the calcining, the powder of the method preparation has good denitration performance, under the condition of flue gas condition 100%, the denitration rate when temperature window is 320-400 ℃ can reach more than 95%.
And the press filtration dewatering process is easy and simple to handle compared to the evaporation drying mode after adopting dipping, is easy to large-scale production, has reduced energy consumption, and the vanadium tungsten component that contains in the filtrate simultaneously can recycle when the preparation maceration extract, has reduced the waste of raw material.
The specific embodiment
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 250g/L, in the time of 60 ℃, regulate its pH value to 4.0 with caustic soda, regulate pH value to 5.0 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 10.5kg oxalic acid, join 23.5L, in 60 ℃ the water, the ammonium metatungstate that adds 14.6kg fully after the dissolving, the ammonium metavanadate that slowly adds again 3.49kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 250g/L adds the maceration extract that step 2 prepares in the time of 60 ℃, press filtration behind the stirring 2h;
4) filter cake that step 3) is obtained is at the lower calcining of 400 ℃ temperature 5h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 2
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 280g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.6 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 11.9kg oxalic acid, join 26.7L, in 60 ℃ the water, the ammonium metatungstate that adds 19.8kg fully after the dissolving, the ammonium metavanadate that slowly adds again 3.95kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 280g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 3h;
4) filter cake that step 3) is obtained is at the lower calcining of 500 ℃ temperature 3h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 3
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 280g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.7 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 12.0kg oxalic acid, join 26.9L, in 60 ℃ the water, the ammonium metatungstate that adds 23.4kg fully after the dissolving, the ammonium metavanadate that slowly adds again 4.00kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 280g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 4h;
4) filter cake that step 3) is obtained is at the lower calcining of 450 ℃ temperature 5h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 4
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 300g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.5 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 15.8kg oxalic acid, join 35.4L, in 60 ℃ the water, the ammonium metatungstate that adds 17.5kg fully after the dissolving, the ammonium metavanadate that slowly adds again 5.25kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 300g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 2h;
4) filter cake that step 3) is obtained is at the lower calcining of 550 ℃ temperature 2h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 5
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 300g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.6 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 15.9kg oxalic acid, join 35.8L, in 60 ℃ the water, the ammonium metatungstate that adds 21.2kg fully after the dissolving, the ammonium metavanadate that slowly adds again 5.31kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 300g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 3h;
4) filter cake that step 3) is obtained is at the lower calcining of 500 ℃ temperature 2h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 6
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 300g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.7 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 16.1kg oxalic acid, join 36.2L, in 60 ℃ the water, the ammonium metatungstate that adds 25.0kg fully after the dissolving, the ammonium metavanadate that slowly adds again 5.36kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 300g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 4h;
4) filter cake that step 3) is obtained is at the lower calcining of 450 ℃ temperature 4h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 7
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 320g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.5 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 20.2kg oxalic acid, join 45.4L, in 60 ℃ the water, the ammonium metatungstate that adds 18.6kg fully after the dissolving, the ammonium metavanadate that slowly adds again 6.73kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 320g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 2h;
4) filter cake that step 3) is obtained is at the lower calcining of 500 ℃ temperature 3h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 8
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 320g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 5.6 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 20.4kg oxalic acid, join 45.9L, in 60 ℃ the water, the ammonium metatungstate that adds 22.6kg fully after the dissolving, the ammonium metavanadate that slowly adds again 6.81kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 320g/L adds the maceration extract that step 2 prepares in the time of 60 ℃, press filtration behind the stirring 3h;
4) filter cake that step 3) is obtained is at the lower calcining of 450 ℃ temperature 5h;
5) the calcining material that step 4) is obtained is pulverized.
Embodiment 9
1) the intermediate product metatitanic acid of Titanium White Production By Sulfuric Acid Process is made slurries 500L, concentration is with TiO
2Count 350g/L, in the time of 60 ℃, regulate its pH value to 5.0 with caustic soda, regulate pH value to 6.0 with ammoniacal liquor again, filter-press water-washing after adjusting is finished.
2) preparation of maceration extract, take by weighing 23.3kg oxalic acid, join 52.5L, in 60 ℃ the water, the ammonium metatungstate that adds 42.9kg fully after the dissolving, the ammonium metavanadate that slowly adds again 7.78kg after the stirring and dissolving all leaves standstill after the dissolving and is aged to color and no longer changes and stablize, and this process can be produced a large amount of gases.
3) the filter cake making beating that the step 1) washing is obtained is that concentration is with TiO
2The slurries 500L of meter 350g/L adds step 2 in the time of 60 ℃) maceration extract for preparing, stir press filtration behind the 4h;
4) filter cake that step 3) is obtained is at the lower calcining of 550 ℃ temperature 2h;
5) the calcining material that step 4) is obtained is pulverized.
Above embodiment illustrates the technical scheme that the present invention puts down in writing, and is all in the situation that do not break away from the simple distortion that core of the present invention makes or revise and all fall into protection scope of the present invention.
Claims (3)
1. denitrating catalyst V
2O
5-WO
3/ TiO
2The preparation method of powder is characterized in that, the method may further comprise the steps:
1) metatitanic acid is made slurries, concentration is with TiO
2Count 250-350g/L, be heated to 60 ℃, regulate its pH value to 4.0-5.0 with caustic soda, regulate the pH value to 5.0-6.0 with ammoniacal liquor again, then filter-press water-washing;
2) preparation maceration extract: oxalic acid is joined in 60 ℃ of water, stirring is dissolved oxalic acid fully, adds ammonium metatungstate again, stirs slowly to add ammonium metavanadate after ammonium metatungstate dissolves fully again, all add to leave standstill after the dissolving and be aged to color and no longer change ammonium metavanadate addition V
2O
5/ TiO
2=0.8-1.2: 88-94, ammonium metatungstate addition WO
3/ TiO
2=5-10: 88-94, the oxalic acid addition is 3 times of ammonium metavanadate quality;
3) the filter cake making beating that step 1) is obtained, concentration is with TiO
2Count 250-350g/L, be heated to 60 ℃, then add step 2) maceration extract that obtains, stir press filtration behind 2 ~ 4h;
4) filter cake that step 3) is obtained is at the lower calcining of 400-550 ℃ temperature 2-5h;
5) the calcining material that step 4) is obtained is pulverized.
2. a kind of denitrating catalyst V according to claim 1
2O
5-WO
3/ TiO
2The preparation method of powder is characterized in that, the metatitanic acid of step 1) is the intermediate product of Titanium White Production By Sulfuric Acid Process.
3. a kind of denitrating catalyst V according to claim 1 and 2
2O
5-WO
3/ TiO
2The preparation method of powder is characterized in that, the filtrate that step 3) obtains is used for step 2) the preparation maceration extract.
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|---|---|---|---|
| CN201210331981.9A CN102921403B (en) | 2012-09-11 | 2012-09-11 | Method for preparing V2O5-WO3/TiO2 powder for making denitration catalyst |
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| CN104415781A (en) * | 2013-08-22 | 2015-03-18 | 上海郎特汽车净化器有限公司 | Ship diesel engine gas exhaust denitration catalyst preparation method |
| CN105478133A (en) * | 2015-12-11 | 2016-04-13 | 福建工程学院 | Low-cost SCR denitration catalyst and preparation method thereof |
| CN107537545A (en) * | 2017-09-27 | 2018-01-05 | 国电环境保护研究院 | A kind of preparation method and application of high vanadium catalyst |
| CN108855044A (en) * | 2018-04-18 | 2018-11-23 | 浙江工业大学 | Preparation method of vanadium-tungsten catalyst |
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| CN113457440A (en) * | 2021-07-23 | 2021-10-01 | 凯盛晶华玻璃有限公司 | Process and device for denitration of flue gas by catalyst filtering unit |
| CN114988467A (en) * | 2022-07-01 | 2022-09-02 | 安徽迪诺环保新材料科技有限公司 | Low-sulfur high-pH titanium dioxide and production method thereof |
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