WO2008038422A1 - zÉolite de type β pour catalyseurs SCR et procÉdÉ de conversion des oxydes d'azote au moyen de ladite zÉolite - Google Patents
zÉolite de type β pour catalyseurs SCR et procÉdÉ de conversion des oxydes d'azote au moyen de ladite zÉolite Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/04—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
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- 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
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- B01J2235/15—X-ray diffraction
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- 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
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- 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
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/7215—Zeolite Beta
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- B01J29/00—Catalysts comprising molecular sieves
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- 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
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
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- 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
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
- B01J29/7615—Zeolite Beta
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/70—Catalysts, in general, characterised by their form or physical properties characterised by their crystalline properties, e.g. semi-crystalline
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
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- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
- C01B39/48—Other types characterised by their X-ray diffraction pattern and their defined composition using at least one organic template directing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D2255/502—Beta zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0246—Coatings comprising a zeolite
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- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a high-performance SCR catalyst and a ⁇ -type zeolite used therefor.
- ⁇ -type zeolite is known as a zeolite used in ⁇ reduction catalysts, especially ⁇ ⁇ ⁇ ⁇ reduction catalysts that use ammonia as a reducing agent (selective catalytic reduction, generally called SCR catalyst).
- SCR catalyst selective catalytic reduction
- SCR catalyst using type zeolite has reduced ⁇ reduction performance after endurance treatment in a high-temperature steam atmosphere (hereinafter referred to as “hydrothermal endurance treatment”), especially at low temperatures below 300 ° C There was a force that could not be used significantly.
- the decline in performance after hydrothermal endurance treatment of SCR catalysts using such j8-type zeolite is due to insufficient heat resistance of the / 3-type zeolite. The cause has not been fully elucidated so far.
- Both the previous literature reports and the SCR catalyst performance using commercially available j8 zeolite had a NOx reduction rate of less than 30% at 200 ° C after hydrothermal durability treatment.
- ⁇ -type zeolite is well known as zeolite used as a catalyst or adsorbent. To improve its heat resistance, it is known to increase the silica-alumina ratio or increase the crystal diameter. It has been. (Refer to Patent Documents 2 and 3) However, when the silica / alumina ratio was increased or crystallized, the performance of the SCR catalyst, particularly at low temperatures, could not be improved.
- Patent Document 4 Some proposals have been made to improve the performance of SCR catalysts using / 3 type zeolite. For example, a method of dealumination by hydrothermal treatment before use has been proposed. (Patent Document 4) However, the performance after the hydrothermal endurance treatment is still not sufficient. In addition to the iron normally used as a catalyst support metal, rare earth elements are added. Thus, a method for improving the heat resistance has been reported. (Patent Document 5) However, even with this method, the NOx reduction rate at 200 ° C was less than 30%, and more expensive rare earths were required.
- Patent Document 1 Patent No. 2904862
- Patent Document 3 JP-A-11-228128
- Patent Literature 4 Special Table 2004— 536756
- Patent Document 5 JP2005-177570
- Patent Document 6 JP-A-61-136910
- Patent Document 7 JP-A 61-281015
- Patent Document 8 JP-A-5-201722
- Patent Document 9 JP-A-6-287015
- Patent Document 10 JP-A-7-247114
- Patent Document 11 JP-A-9-175818
- the present invention provides an SCR catalyst having high NOx reduction properties, particularly low-temperature NOx reduction performance after hydrothermal durability treatment, and little residual irritating and toxic ammonia in the treated exhaust gas, and ⁇ -type used therein A zeolite is provided.
- the present inventors have developed an SCR catalyst using j8-type zeolite, particularly after hydrothermal durability treatment.
- SCR catalysts using specific 13-type zeolite have high low temperature characteristics after hydrothermal durability treatment, especially NOx reduction performance at 250 ° C or below, and treatment. It has been found that ammonia in exhaust gas can be reduced, and the present invention has been completed.
- the SCR 13-type zeolite of the present invention has a high SiO ZA1 O molar ratio
- Type 8 zeolite supports metals such as iron and copper.
- the method for reducing and purifying nitrogen oxides of the present invention includes the following inventions (1) to (6).
- Molar ratio of SiO ZA1 O is 20 or more and less than 40, SEM particle size is 0.35 m or more, X-ray connection
- the half width (FWHM) of the crystal diffraction (302) plane is less than 0.30 ° and the NH adsorption amount is lmm.
- a reduction and purification method comprising a step of reducing nitrogen oxydide with an SCR catalyst comprising ⁇ -type zeolite of olZg or more.
- the molar ratio of SiO ZA1 O is 22 or more and less than 30, and the NH adsorption amount is 1.2 mmolZg or less.
- the NOx reduction rate after hydrothermal durability treatment is 75% or more at 250 ° C. Reduction purification method.
- the j8 type zeolite of the present invention includes the following inventions (7) to (11).
- the half width (FWHM) of the crystal diffraction (302) plane is less than 0.30 ° and the NH adsorption amount is lmm.
- ⁇ -type zeolite that is olZg or higher.
- the molar ratio of SiO 2 / Al 2 O is 22 or more and less than 30, and the NH adsorption amount is 1.2 mm.
- the ⁇ -type zeolite according to the above (7) which is 2 2 3 3 olZg or more.
- the SCR catalyst of the present invention includes the following inventions (12) to (17).
- the molar ratio of SiO 2 / Al 2 O is 20 or more and less than 40, SEM particle size is 0.35 m or more, X-ray
- the full width at half maximum (FWHM) of the crystal diffraction (302) plane is less than 0.30 ° and the NH adsorption amount is lm.
- An SCR catalyst comprising j8-type zeolite of molZg or more.
- the molar ratio of SiO 2 / Al 2 O is 22 or more and less than 30, and the NH adsorption amount is 1.2 mmol / g
- the ⁇ -type zeolite for SCR catalyst of the present invention has SCR catalyst performance after hydrothermal durability treatment, Provides an SCR catalyst that excels in low-temperature NOx reduction and does not cause problems of irritating and toxic ammonia emissions in the exhaust gas when ammonia is used as the reducing agent.
- the molar ratio of SiO ZA1 O is 20 or more and less than 40
- the SEM grain size is 0.35 i um or more, and the full width at half maximum (FWHM) of the X-ray crystal diffraction (302) plane is 0.30.
- FWHM full width at half maximum
- the molar ratio of SiO ZA1 O in the 13-type zeolite for SCR catalyst of the present invention is 20 or more and less than 40,
- it is preferably 22 or more and less than 30 and more preferably 23 or more and less than 29. If it is less than 20, the heat resistance is not sufficient, but generally the heat resistance increases. If it exceeds 40, the NOx reducing ability of the present invention at low temperatures cannot be exhibited! /.
- the 13-type zeolite for SCR catalyst of the present invention preferably has a SEM particle size of 0.35 ⁇ m or more, and particularly preferably a SEM diameter of 0.4 m or more.
- the upper limit is not particularly limited, but is preferably 2 m or less from the viewpoint of the dynamic performance of the SCR catalyst and ease of production.
- 8-type zeolite for the SCR catalyst of the present invention is less than 0.30 ° in a fresh state, and particularly less than 0.25 °. Is preferred. Further, the half width (FWHM) of the X-ray crystal diffraction (302) plane after hydrothermal durability treatment is preferably less than 0.35 °, particularly preferably less than 0.30 °. If the above X-ray crystal diffraction half-width (FWHM) is exceeded under each condition, the SCR catalyst, especially the low-temperature NOx reduction, is reduced.
- the lower limit of the full width at half maximum (FWHM) of the X-ray crystal diffraction (302) plane under any of the conditions is up to about 0.15 ° in the molar ratio of SiO 2 / Al 2 O of the present invention.
- the inguinal diameter is the average value of 30 particles measured by electron microscope observation.
- the ⁇ -type zeolite for SCR catalyst of the present invention is in a fresh state (before hydrothermal durability treatment).
- NH adsorption amount is more than ImmolZg, especially 1.2mmolZg
- the upper limit of the amount is not particularly limited.
- the 13-type zeolite for SCR catalyst of the present invention is high in a fresh state! , NH adsorption amount
- the NH adsorption amount after hydrothermal endurance treatment is 0.4 mmolZg or less.
- the upper limit of the NH adsorption amount after hydrothermal durability treatment is not particularly limited.
- the SCR catalyst exhibits NOx decomposition performance by supporting an active metal such as iron or copper on j8-type zeolite. Even if these metals are sufficiently supported, the NH of the present invention
- the hydrothermal durability treatment referred to in the present invention means a heat treatment under an air flow containing 10% by volume of water vapor, more specifically, treatment under the following conditions.
- SCR catalysts are generally evaluated by their performance after hydrothermal endurance treatment, but there is no standardized hydrothermal endurance treatment condition.
- the hydrothermal durability treatment conditions in the present invention that is, the durability test at an atmospheric moisture concentration of 10% by volume of 700 ° C is a category of general conditions as the hydrothermal durability treatment conditions of the SCR catalyst, and is not particularly special. .
- j8 type zeolite thermal damage to zeolite at 600 ° C or higher exponentially increases, and hydrothermal durability treatment at 700 ° C for 20 hours is 100 to 200 at 650 ° C. If the temperature is 800 ° C or more, it is equivalent to processing for several hours.
- the NH adsorption amount of the type zeolite is desorbed from the j8 type zeolite adsorbed with ammonia.
- the NH adsorption amount in the present invention can be measured by the following method.
- the SCR catalyst of the present invention has a NOx reduction rate at 200 ° C of 30% or more after hydrothermal durability treatment, and particularly preferably 35% or more. If the NOx reduction rate at 200 ° C is less than 30%, it is insufficient for practical use with low catalytic activity.
- the upper limit is not particularly limited, and is about 50% after hydrothermal durability treatment, which is considered to vary depending on the metal species to be supported.
- the SCR catalyst of the present invention preferably has a NOx reduction rate at 250 ° C of 75% or more.
- the SCR catalyst of the present invention has a NOx decomposition rate at 250 ° C after hydrothermal durability treatment of 75% or more, and is particularly excellent in durability.
- the upper limit is not particularly limited and is about 90% after hydrothermal durability treatment.
- the NOx reduction rate of the SCR catalyst in the present invention can be defined by the reduction of nitrogen oxides when a gas having the following conditions is contacted at a predetermined temperature.
- SCR catalysts are generally evaluated using a gas that contains NO gas, which generally undergoes reductive decomposition, and ammonia, the reducing agent, in a 1: 1 ratio.
- the NOx reduction conditions used in the present invention fall within the category of general conditions for evaluating the NOx reduction properties of SCR catalysts, and are not particularly special.
- the SCR catalyst of the present invention is a catalyst in which at least one metal from the group VIII and group IB of the periodic table is supported on a j8 type zeolite, particularly iron, cobalt, noradium, iridium, platinum, copper, silver, It is preferably one or more selected from the group of gold, more preferably one or more of iron, palladium, platinum, copper, and silver, and more preferably one carrying iron or copper.
- a promoter component such as a rare earth metal, titanium, or zirconium oxide can be additionally added.
- the loading method for loading the active metal species is not particularly limited.
- methods such as an ion exchange method, an impregnation loading method, an evaporation to dryness method, a precipitation loading method, and a physical mixing method can be employed.
- the materials used for supporting the metal may be any soluble Z-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 2 to 7%.
- the SCR catalyst of the present invention can also 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, alofen, and sepiolite.
- the SCR catalyst of the present invention can purify exhaust gas by contacting the exhaust gas containing nitrogen oxides.
- Examples of nitrogen oxides purified by 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 exhaust gas that can be treated by the present invention is not limited.
- the exhaust gas may contain components other than nitrogen oxides, for example, hydrocarbons. Elemental, carbon monoxide, carbon dioxide, hydrogen, nitrogen, oxygen, sulfur oxide, and water may be contained. Specifically, in the method of the present invention, nitrogen oxides can be purified 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. ⁇ ⁇ ⁇ ⁇ ⁇ Ammonia, urea, and organic amines are especially used to increase the efficiency.
- the method of adding 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 spray pyrolysis, etc. can be employed. .
- the amount of these reducing agents added can be arbitrarily set so that the nitrogen oxides can be sufficiently purified.
- the space velocity when the SCR catalyst is contacted with the exhaust gas is not particularly limited, but preferably the space velocity is 500 to 500,000 on a volume basis. hr _1, and more preferably from 2000 to 300,000 hr _ 1.
- the SCR catalyst of the present invention has a low emission of irritating and toxic gases contained in the exhaust gas when used as an SCR catalyst that has not only high NOx purification activity.
- ammonia When ammonia is used as a reducing agent, there is a problem that a large amount of irritating and toxic ammonia is discharged because the catalyst activity has been low in the past, and there is another problem on the downstream side of the SCR catalyst. It was necessary to treat ammonia with a catalyst system.
- the method for producing the ⁇ -type zeolite for SCR catalyst of the present invention is not particularly limited, but it is produced by selecting conditions satisfying the molar ratio, SEM diameter, and crystallinity of SiO ZA1 O of the present invention.
- the SCR of the present invention There is no example that shows that the characteristics of the catalyst, that is, low-temperature NOx reduction after hydrothermal endurance treatment, is satisfied.
- ⁇ -type zeolite can be usually produced by hydrothermal synthesis in the presence of a silica source, an aluminum source, an alkali, an organic directing agent, water, and optionally a fluorinating agent.
- a silica source an aluminum source
- an alkali an organic directing agent
- water an organic directing agent
- fluorinating agent an organic directing agent for SCR catalyst.
- Patent Document 8 discloses by the applicant of the present invention.
- the zeolite for SCR catalyst of the present invention may use other general organic directing agents (SDA and ⁇ ⁇ ) or fluorine compounds as long as the above conditions are satisfied!
- SDA raw materials include tetraethylammonium hydroxide having tetraethylammonium cation, tetraethylammonium-mubromide, tetraethylammonium-umfluoride, and otatamethylenebiskinuclide, ⁇ , ⁇ , Um p xylene, ⁇ , ⁇ , ⁇ ⁇ ⁇ m xylene, ⁇ , ⁇ , ⁇ ⁇ ⁇ ⁇ xylene, 1, 4 diazabicyclo [2, 2, 2] octane, 1, 3, 3, ⁇ , ⁇ Pentamethyl-6-azo-umbicyclo [3, 2, 1] octane or ⁇ , ⁇ -jetyl 1, 3, 3 trimethyl 6 azoumbicyclo [3, 2, 1] octane cation .
- fluorine compound raw material hydrofluoric acid, ammonium fluoride, sodium fluoride, silicon fluoride, fluorosilicate ammonium, sodium fluorosilicate, or the like can be used.
- hydrofluoric acid ammonium fluoride, sodium fluoride, silicon fluoride, fluorosilicate ammonium, sodium fluorosilicate, or the like can be used.
- the slurry product is reacted under stirring so that the composition of the slurry product is SiO: 0.05A1 O to obtain a slurry product, dehydrated, washed.
- the composition of the reaction mixture is SiO: 0.05A1 O: 0.667 TEAF: 11. OH O
- composition of the raw slurry using sodium silicate aqueous solution and aluminum sulfate aqueous solution is SiO:
- Example 1 with the exception of 9H 2 O, hydrothermal synthesis conditions of 150 ° C, 66 hours, and firing temperature of 600 ° C.
- composition of the raw slurry using sodium silicate aqueous solution and aluminum sulfate aqueous solution is SiO:
- Example 2 The same treatment as in Example 1 was conducted except that the baking temperature was 600 ° C at 150 ° C for 88 hours.
- composition of the slurry-like product using a sodium silicate aqueous solution and an aluminum sulfate aqueous solution is SiO: 0.034A1 O, and the composition of the reaction mixture is SiO: 0.03A1 O: 0.05KOH: 0.1
- Example 2 The same treatment as in Example 1 was conducted except that the baking temperature was set to 50 ° C., 88 hours, and 600 ° C.
- composition of the slurry product using a sodium silicate aqueous solution and an aluminum sulfate aqueous solution is SiO: 0.034A1 O
- composition of the reaction mixture is SiO: 0.034A1 O: 0.07 TEABr: 0.00.
- Example 2 The same treatment as in Example 1 was carried out except that the baking temperature was 600 ° C at 150 ° C for 144 hours.
- Amorphous silica powder made by Tosoh Silica (trade name: Nibseal VN-3), hydroxyaluminum-aluminum, and the composition of the reaction mixture was changed to SiO: 0.03 A1 O: 0.16 TEAOH: 9.9
- Example 2 The same treatment as in Example 1 was carried out except that HS was used as seed crystal and Tosoh HSZ930NHA was used as the seed crystal, hydrothermal synthesis conditions were 150 ° C for 120 hours, and the firing temperature was 600 ° C. 29's Type zeolite was synthesized.
- Tetraethylorthosilicate, aluminum isopropoxide, and TEAOH were mixed, and ethanol and water were evaporated by stirring at room temperature.
- the composition of the reaction mixture is SiO: 0.0
- a 13-type zeolite having a SiO ZA1 O molar ratio of 29 was synthesized in the same manner as in Example 1 except that the hydrothermal synthesis conditions were 150 ° C, 72 hours, and the calcination temperature was 600 ° C.
- composition of the raw slurry using sodium silicate aqueous solution and aluminum sulfate aqueous solution is SiO:
- Example 2 The same treatment as in Example 1 was carried out except that 150 ° C. and 88 hours were set, and the SiO ZA1 O molar ratio was 22
- ⁇ -type zeolite was synthesized.
- An SCR catalyst carrying 3% by weight of Fe metal was prepared using 33 aqueous solution.
- Commercially available j8 type zeolite includes Tosoh j8 type zeolite (product name: HSZ-940) with a SiO ZA1 O molar ratio of 40.
- the SCR catalyst using the ⁇ -type zeolite of the present invention has a NOx reduction rate at a low temperature even after hydrothermal endurance treatment is at least 20% at least compared with the conventional product, which is about 3 times the maximum. Showed activity.
- Type 8 zeolite for SCR catalyst of the present invention is superior in SCR catalyst performance after hydrothermal durability treatment, especially low-temperature NOx reduction, and when ammonia is used as a reducing agent, it is irritating and toxic ammonia in exhaust gas. There is no problem of emission ⁇ ⁇ ⁇ SCR catalyst can be provided.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/442,458 US9061241B2 (en) | 2006-09-27 | 2007-03-14 | β-Zeolite for SCR catalyst and method for purifying nitrogen oxides using same |
EP07738584.7A EP2067746B1 (en) | 2006-09-27 | 2007-03-14 | ß - ZEOLITE FOR SCR CATALYST AND METHOD FOR PURIFYING NITROGEN OXIDES USING SAME |
KR1020097005672A KR101286006B1 (ko) | 2006-09-27 | 2007-03-14 | SCR 촉매용 β 형 제올라이트 및 그것을 사용한 질소 산화물의 정화 방법 |
CN2007800355740A CN101516778B (zh) | 2006-09-27 | 2007-03-14 | SCR催化剂用β型沸石及使用它的氮氧化物的净化方法 |
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JP2006262303A JP5082361B2 (ja) | 2006-09-27 | 2006-09-27 | SCR触媒用β型ゼオライト及びそれを用いた窒素酸化物の浄化方法 |
JP2006-262303 | 2006-09-27 |
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WO2008038422A1 true WO2008038422A1 (fr) | 2008-04-03 |
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PCT/JP2007/055114 WO2008038422A1 (fr) | 2006-09-27 | 2007-03-14 | zÉolite de type β pour catalyseurs SCR et procÉdÉ de conversion des oxydes d'azote au moyen de ladite zÉolite |
Country Status (6)
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US (1) | US9061241B2 (ja) |
EP (1) | EP2067746B1 (ja) |
JP (1) | JP5082361B2 (ja) |
KR (1) | KR101286006B1 (ja) |
CN (1) | CN101516778B (ja) |
WO (1) | WO2008038422A1 (ja) |
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JP2011148677A (ja) * | 2009-12-25 | 2011-08-04 | Tosoh Corp | 新規メタロシリケート |
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Cited By (7)
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EP2314544B1 (en) * | 2008-08-19 | 2023-06-28 | Tosoh Corporation | Highly heat-resistant beta-zeolite and scr catalyst using same |
US9138685B2 (en) | 2009-08-27 | 2015-09-22 | Tosoh Corporation | Highly hydrothermal-resistant SCR catalyst and manufacturing method therefor |
WO2011078149A1 (ja) * | 2009-12-22 | 2011-06-30 | 東ソー株式会社 | 新規メタロシリケート、その製造方法、窒素酸化物浄化触媒、その製造方法、及びそれを用いた窒素酸化物浄化方法 |
JP2011148678A (ja) * | 2009-12-22 | 2011-08-04 | Tosoh Corp | 新規メタロシリケート及び窒素酸化物浄化触媒 |
EP2518017A4 (en) * | 2009-12-22 | 2015-09-23 | Tosoh Corp | NEW METAL SILICATE, MANUFACTURING METHOD, NITRIC OXIDE CLEANING CATALYST, PRODUCTION METHOD AND NITRIC OXIDE CLEANING METHOD THEREWITH |
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JP2011148677A (ja) * | 2009-12-25 | 2011-08-04 | Tosoh Corp | 新規メタロシリケート |
Also Published As
Publication number | Publication date |
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EP2067746A4 (en) | 2009-12-30 |
EP2067746B1 (en) | 2017-01-25 |
EP2067746A1 (en) | 2009-06-10 |
JP5082361B2 (ja) | 2012-11-28 |
US20100003178A1 (en) | 2010-01-07 |
CN101516778A (zh) | 2009-08-26 |
KR20090055581A (ko) | 2009-06-02 |
CN101516778B (zh) | 2011-03-16 |
KR101286006B1 (ko) | 2013-07-15 |
JP2008081348A (ja) | 2008-04-10 |
US9061241B2 (en) | 2015-06-23 |
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