WO2009139088A1 - 窒素酸化物浄化用触媒 - Google Patents
窒素酸化物浄化用触媒 Download PDFInfo
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- WO2009139088A1 WO2009139088A1 PCT/JP2008/070172 JP2008070172W WO2009139088A1 WO 2009139088 A1 WO2009139088 A1 WO 2009139088A1 JP 2008070172 W JP2008070172 W JP 2008070172W WO 2009139088 A1 WO2009139088 A1 WO 2009139088A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F01N3/18—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 characterised by methods of operation; Control
- F01N3/20—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 characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- 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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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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
- B01J29/7049—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing rare earth elements, titanium, zirconium, hafnium, zinc, cadmium, mercury, gallium, indium, thallium, tin or lead
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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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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
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- B01J37/024—Multiple impregnation or coating
- B01J37/0242—Coating followed by impregnation
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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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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
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- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20738—Iron
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
- B01D2255/502—Beta zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N2370/00—Selection of materials for exhaust purification
- F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a nitrogen oxide purification catalyst that selectively reduces nitrogen oxides, and more particularly to a nitrogen oxide purification catalyst that selectively reduces nitrogen oxides in diesel engine exhaust gas.
- An object of the present invention is to provide a nitrogen oxide purification catalyst which has a high selective reduction activity to nitrogen oxides and which exhibits less deterioration in performance after durability.
- the present inventors have found that the selective reduction activity is high by using ⁇ -zeolite carrying an oxide of a rare earth metal and titanium dioxide carrying an oxide of a rare earth metal in combination.
- the present invention has also found that nitrogen oxide purification catalysts having a small reduction in performance after durability can be obtained, and further that they can further improve the durability by supporting them with iron oxides or hydroxides. Completed.
- the catalyst for purifying nitrogen oxides according to the present invention is characterized in that it comprises ⁇ zeolite carrying an oxide of a rare earth metal and titanium dioxide carrying an oxide of a rare earth metal.
- the catalyst for purifying nitrogen oxides according to the present invention carries a ⁇ zeolite carrying an oxide of rare earth metal and an oxide or hydroxide of iron, an oxide of rare earth metal and an oxide or hydroxide of iron It is characterized by comprising titanium dioxide.
- the nitrogen oxide purification catalyst of the present invention is characterized by comprising a carrier made of a ceramic or a metal material and a layer of any of the above-mentioned nitrogen oxide purification catalysts supported on the carrier. Do.
- the nitrogen oxide purification catalyst of the present invention has a high selective reduction activity to nitrogen oxides, a small decrease in performance after durability, and is particularly excellent in selectively reducing nitrogen oxides in diesel engine exhaust gas.
- the nitrogen oxide purification catalyst of the present invention is a combination of a ⁇ -zeolite carrying a rare earth metal oxide and a titanium dioxide carrying a rare earth metal oxide.
- Nitrogen oxides when ⁇ -zeolite supporting rare earth metal oxide and iron oxide or hydroxide and titanium dioxide supporting rare earth metal oxide and iron oxide or hydroxide are used in combination The selective reduction activity for C. is increased, and the deterioration in performance after endurance is further reduced (i.e., the durability is improved).
- oxides of rare earth metals that can be used in the catalyst for purifying nitrogen oxides according to the present invention
- oxides of all the rare earth metals supported on zeolite and used in conventionally known catalysts for purifying nitrogen oxides are used
- oxides such as lanthanum, cerium, praseodymium, neodymium, samarium, gadolium can be used.
- the nitrogen oxide purification catalyst of the present invention usually carries a support made of a ceramic or metal material and an oxide of a rare earth metal supported on the support and an oxide of a rare earth metal supported on the support.
- a layer of nitrogen oxide purification catalyst comprising titanium dioxide, or oxide of rare earth metal and oxide or hydroxide of iron, oxide of ⁇ zeolite and oxide of rare earth metal, oxide of iron or oxide of hydroxide
- a layer of a nitrogen oxide purification catalyst comprising supported titanium dioxide.
- the shape of the carrier made of the ceramic or metal material used in the present invention is not particularly limited, but in general, it is a shape such as a honeycomb, a plate, or a pellet, and preferably a honeycomb shape.
- a material of such a support for example, ceramics such as alumina (Al 2 O 3 ), mullite (3Al 2 O 3 -2SiO 2 ), cordierite (2MgO-2Al 2 O 3 -5SiO 2 ), etc. Examples include metal materials such as stainless steel. Cordierite materials are particularly useful because they have a very low coefficient of thermal expansion of 1.0 ⁇ 10 ⁇ 6 / ° C.
- a layer of a nitrogen oxide purification catalyst comprising a support made of a ceramic or a metal material, and a zeolite containing an oxide of a rare earth metal supported on the support and a titanium dioxide supporting an oxide of the rare earth metal.
- the supported amount of .beta.-zeolite is 60 to 300 g / L
- the supported amount of titanium dioxide is 1 to 100 g / L
- the supported amount of rare earth metal oxide is 1 to It is preferably 100 g / L.
- a support made of a ceramic or metal material, an oxide of a rare earth metal and an oxide or hydroxide of iron supported on the support, an oxide of ⁇ zeolite and an oxide of a rare earth metal, an oxide of iron or
- the nitrogen oxide purification catalyst comprising a nitrogen oxide purification catalyst layer comprising titanium dioxide carrying hydroxide
- the supported amount of ⁇ zeolite is 60 to 300 g / L
- the supported amount of titanium dioxide Is 1 to 100 g / L
- the supported amount of the oxide of the rare earth metal is 1 to 100 g / L
- the supported amount of the oxide or hydroxide of iron is the amount of iron (that is, 1) to 50 g / L.
- the loading amount of each component is less than the above lower limit value, the effect aimed by the present invention is small, and if the loading amount of each component is more than the above upper limit value, the increase amount is appropriate. Not only the effect can not be obtained but also the production tends to be difficult because it becomes difficult to coat the carrier.
- the catalyst for purifying nitrogen oxide of the present invention it is preferable to use one having a SiO 2 / Al 2 O 3 molar ratio of 10 to 200/1 as the ⁇ -zeolite raw material.
- a raw material to be titanium dioxide a compound to be titanium dioxide by firing, for example, titanium dioxide sol, titanium chloride, titanium sulfate, titanium tetraisopropoxide, titanium dioxide itself or the like can be used.
- a compound to be an oxide of a rare earth metal by firing for example, a nitrate, an acetate, a carbonate, a sulfate, or a phosphate of a rare earth metal can be used.
- a compound which becomes an oxide or a hydroxide of iron by baking iron nitrate, iron chloride, iron acetate, iron hydroxide, iron oxalate, iron sulfate, iron phosphate etc. can be used, for example.
- the oxide or hydroxide of iron may be Fe 2 O 3 , FeOOH, Fe 3 O 4 , FeO or the like depending on the firing conditions.
- the nitrogen oxide purification catalyst of the present invention can be prepared by various methods. For example, an aqueous slurry containing ⁇ zeolite, an aqueous slurry containing a compound that becomes titanium dioxide by firing and a binder is coated on a support, dried and fired, and then an aqueous solution containing a compound that becomes an oxide of a rare earth metal by firing, or a rare earth metal by firing The compound can be impregnated and immersed in an aqueous solution containing a compound to be an oxide of the compound and a compound to be an oxide or a hydroxide of iron by firing, and after taking out from the aqueous solution, it can be dried and calcined.
- ⁇ -zeolite a compound to be titanium dioxide by firing, an aqueous slurry containing a compound to be a rare earth metal oxide by firing and a binder
- ⁇ -zeolite, a compound to be titanium dioxide by firing, an oxide of a rare earth metal by firing The carrier can be prepared by coating an aqueous slurry containing the following compound, a compound that becomes an oxide or hydroxide of iron upon firing, and a binder on a carrier, drying, and firing.
- an aqueous slurry containing ⁇ -zeolite, a compound that becomes titanium dioxide by firing, a compound that becomes an oxide of a rare earth metal by firing, and a binder is coated on a support, dried and fired, and then iron oxide or water by firing. It can also be prepared by immersing and impregnating in an aqueous solution containing a compound to be an oxide, taking out from the aqueous solution, drying, and calcining.
- the nitrogen oxide purification catalyst of the present invention selectively reduces and purifies nitrogen oxides in the presence of NH 3 . Therefore, it is necessary to supply NH 3 into the exhaust gas, as is known, by a method of directly supplying NH 3 gas, by a method of adding ammonia water, or a substance which is decomposed to generate NH 3 such as urea or hexamethylenetetramine. It is possible to adopt a method of adding
- Example 1 100 parts by mass of ⁇ -zeolite, 67 parts by mass of TiO 2 sol (TiO 2 concentration: 30% by mass), 100 parts by mass of SiO 2 -based binder (SiO 2 concentration: 50% by mass) and 200 parts by mass of pure water
- TiO 2 sol TiO 2 concentration: 30% by mass
- SiO 2 -based binder SiO 2 concentration: 50% by mass
- This slurry is coated on a cordierite carrier ( ⁇ 25.4 mm, L 20 mm, 400 cells) for model gas evaluation so that the supported amount of ⁇ zeolite is 100 g / L and the supported amount of TiO 2 is 20 g / L. , Dried and calcined at 500 ° C.
- Example 2 A nitrogen oxide purification catalyst was obtained in the same manner as in Example 1 except that an aqueous solution consisting of cerium nitrate and pure water was used instead of the aqueous solution consisting of cerium nitrate, iron nitrate and pure water.
- the supported amount of ⁇ zeolite was 100 g / L
- the supported amount of TiO 2 was 20 g / L
- the supported amount of CeO 2 was 20 g / L.
- Comparative Example 1 A slurry was obtained by mixing 100 parts by mass of beta zeolite, 100 parts by mass of SiO 2 -based binder (SiO 2 concentration: 50% by mass) and 200 parts by mass of pure water in a ball mill. This slurry was coated on a cordierite carrier ( ⁇ 25.4 mm, L 20 mm, 400 cells) for model gas evaluation so that the supported amount of ⁇ zeolite was 100 g / L, dried, and calcined at 500 ° C. Then, it was immersed and impregnated in an aqueous solution composed of iron nitrate and pure water, taken out from the aqueous solution, dried, and calcined at 500 ° C. to obtain a nitrogen oxide purification catalyst. The loading amount of Fe at this time was adjusted to be 10 g / L.
- Example 2 ⁇ Exhaust gas purification performance test>
- An exhaust model gas having the composition shown in Table 1 below is circulated at a space velocity of 50000 / h. While raising the temperature to 400 ° C. at a heating rate of 20 ° C./min, the purification rate of NO was measured.
- the purification rate (%) of the model gas at 400 ° C. is as shown in Table 2.
- Example 3 100 parts by mass of beta zeolite, 67 parts by mass of TiO 2 sol (TiO 2 concentration 30% by mass) 50 parts by mass of cerium nitrate 100 parts by mass of SiO 2 -based binder (SiO 2 concentration 50% by mass) and 200 parts by mass
- the pure water was mixed with a ball mill to obtain a slurry.
- This slurry is used as a cordierite carrier ( ⁇ 25.4 mm, L 20 mm, 400 cells) for model gas evaluation, the supported amount of ⁇ zeolite is 100 g / L, the supported amount of TiO 2 is 20 g / L, and CeO 2 supported. It was coated to an amount of 20 g / L, dried and calcined at 500 ° C.
- Example 4 100 parts by mass of ⁇ -zeolite, 67 parts by mass of TiO 2 sol (TiO 2 concentration: 30% by mass), 50 parts by mass of cerium nitrate, 72 parts by mass of iron nitrate, 100 parts by mass of SiO 2 -based binder (SiO 2 concentration: 50 % By mass) and 200 parts by mass of pure water were mixed in a ball mill to obtain a slurry.
- This slurry is used as a cordierite carrier ( ⁇ 25.4 mm, L 20 mm, 400 cells) for model gas evaluation, the supported amount of ⁇ zeolite is 100 g / L, the supported amount of TiO 2 is 20 g / L, and CeO 2 supported.
- the coating amount was 20 g / L and the Fe loading amount was 10 g / L, dried, and calcined at 500 ° C. to obtain a nitrogen oxide purification catalyst.
- Comparative example 2 The ⁇ -zeolite was put into an aqueous iron nitrate solution, and ⁇ -zeolite (powder A) carrying 9% by mass of iron was obtained by evaporation to dryness.
- a TiO 2 sol was added to an aqueous ammonia solution, then cerium nitrate was added, filtered, dried, and calcined at 500 ° C. to obtain a CeO 2 -TiO 2 composite oxide (powder B).
- the mass ratio of CeO 2 to TiO 2 was adjusted to be 1: 1.
- Powder A, powder B, a SiO 2 -based binder and pure water were mixed in a ball mill to obtain a slurry.
- This slurry is used as a cordierite carrier ( ⁇ 25.4 mm, L 20 mm, 400 cells) for model gas evaluation, the supported amount of ⁇ zeolite is 100 g / L, the supported amount of TiO 2 is 20 g / L, and CeO 2 supported.
- the coating amount was 20 g / L and the Fe loading amount was 10 g / L, dried, and calcined at 500 ° C. to obtain a nitrogen oxide purification catalyst.
- Example 4 ⁇ Exhaust gas purification performance test>
- Each catalyst for nitrogen oxide purification obtained in Example 3, Example 4 and Comparative Example 2 is filled in an evaluation device, and the exhaust model gas of the composition shown in the above Table 1 is circulated at a space velocity of 50000 / h. While raising the temperature to 400 ° C. at a heating rate of 20 ° C./min, the purification rate of NO was measured.
- the purification rate (%) of the model gas at 400 ° C. is as shown in Table 3.
- each of the nitrogen oxide purification catalysts obtained in Example 3 and Example 4 and Comparative Example 2 was subjected to durability at 750 ° C. for 20 hours in a nitrogen atmosphere containing 10 mass% oxygen and 10 mass% water. It was processed. Thereafter, these nitrogen oxide purification catalysts are filled in an evaluation device, and 400 model is produced at a temperature rising rate of 20 ° C./min while circulating an exhaust model gas having the composition shown in Table 1 above at a space velocity of 50000 / h. The temperature was raised to ° C., and the purification rate of NO was measured. The purification rate (%) of the model gas at 400 ° C. is as shown in Table 3.
Abstract
Description
実施例1
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸セリウム、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のCeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるように調整した。
硝酸セリウム、硝酸鉄及び純水からなる水溶液の代わりに、硝酸セリウム及び純水からなる水溶液を用いた以外は実施例1と同様に処理して窒素酸化物浄化用触媒を得た。この時のβゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなるように調整した。
100質量部のβゼオライト、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)にβゼオライトの担持量が100g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のFeの担持量が10g/Lとなるように調整した。
実施例1、実施例2及び比較例1で得た各々の窒素酸化物浄化用触媒を評価装置に充填し、下記の第1表に示す組成の排気モデルガスを空間速度50000/hで流通させながら、20℃/分の昇温速度で400℃まで昇温させ、NOの浄化率を測定した。400℃におけるモデルガスの浄化率(%)は第2表に示す通りであった。
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、50質量部の硝酸セリウム、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のFeの担持量が10g/Lとなるように調整した。
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、50質量部の硝酸セリウム、72質量部の硝酸鉄、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるようにコートし、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。
硝酸鉄水溶液中にβゼオライトを投入し、蒸発乾固法により鉄を9質量%担持したβゼオライト(粉末A)を得た。また、アンモニア水溶液にTiO2ゾルを添加し、次いで硝酸セリウムを添加し、ろ過し、乾燥させ、500℃で焼成してCeO2-TiO2複合酸化物(粉末B)を得た。この場合にCeO2とTiO2との質量比が1:1となるように調整した。粉末A、粉末B、SiO2系バインダー及び純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるようにコートし、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。
実施例3、実施例4及び比較例2で得た各々の窒素酸化物浄化用触媒を評価装置に充填し、上記の第1表に示す組成の排気モデルガスを空間速度50000/hで流通させながら、20℃/分の昇温速度で400℃まで昇温させ、NOの浄化率を測定した。400℃におけるモデルガスの浄化率(%)は第3表に示す通りであった。
Claims (6)
- 希土類金属の酸化物を担持したβゼオライトと希土類金属の酸化物を担持した二酸化チタンとからなることを特徴とする窒素酸化物浄化用触媒。
- 希土類金属の酸化物及び鉄の酸化物又は水酸化物を担持したβゼオライトと希土類金属の酸化物及び鉄の酸化物又は水酸化物を担持した二酸化チタンとからなることを特徴とする窒素酸化物浄化用触媒。
- セラミックス又は金属材料からなる担体と、該担体上に担持されている請求項1記載の窒素酸化物浄化用触媒の層とからなることを特徴とする窒素酸化物浄化用触媒。
- βゼオライトの担持量が60~300g/Lであり、二酸化チタンの担持量が1~100g/Lであり、希土類金属の酸化物の担持量が1~100g/Lであることを特徴とする請求項3記載の窒素酸化物浄化用触媒。
- セラミックス又は金属材料からなる担体と、該担体上に担持されている請求項2記載の窒素酸化物浄化用触媒の層とからなることを特徴とする窒素酸化物浄化用触媒。
- βゼオライトの担持量が60~300g/Lであり、二酸化チタンの担持量が1~100g/Lであり、希土類金属の酸化物の担持量が1~100g/Lであり、鉄の酸化物又は水酸化物の担持量が鉄の量として1~50g/Lであることを特徴とする請求項5記載の窒素酸化物浄化用触媒。
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015161627A1 (zh) * | 2014-04-24 | 2015-10-29 | 同济大学 | 一种用于400℃~600℃烟气蜂窝脱硝催化剂及其制备方法 |
JP2016043320A (ja) * | 2014-08-25 | 2016-04-04 | エヌ・イーケムキャット株式会社 | 尿素加水分解触媒及び尿素加水分解材料を用いた選択還元触媒 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2771111A1 (en) * | 2011-10-24 | 2014-09-03 | Haldor Topsøe A/S | Catalyst composition and method for use in selective catalytic reduction of nitrogen oxides |
US9527071B2 (en) | 2012-06-06 | 2016-12-27 | Haldor Topsoe A/S | SCR catalyst and method of preparation thereof |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03270733A (ja) * | 1990-03-20 | 1991-12-02 | Nippon Shokubai Co Ltd | 窒素酸化物除去用触媒 |
JPH08131828A (ja) * | 1994-11-15 | 1996-05-28 | Nkk Corp | 窒素酸化物除去用触媒およびこれを用いた窒素酸化物の 除去方法 |
JP2005177570A (ja) | 2003-12-17 | 2005-07-07 | Ne Chemcat Corp | 高温特性に優れるscr触媒 |
JP2005246341A (ja) * | 2004-03-08 | 2005-09-15 | Babcock Hitachi Kk | 窒素酸化物除去用触媒、その製造方法、および該触媒を用いた窒素酸化物の除去方法 |
JP2006305423A (ja) | 2005-04-26 | 2006-11-09 | Toyota Central Res & Dev Lab Inc | NOx選択還元触媒 |
JP2008080195A (ja) * | 2006-09-26 | 2008-04-10 | Tosoh Corp | 高シリカβ型ゼオライトからなる炭化水素吸着剤 |
JP2008081348A (ja) * | 2006-09-27 | 2008-04-10 | Tosoh Corp | 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 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63123449A (ja) * | 1986-11-12 | 1988-05-27 | Babcock Hitachi Kk | 排ガス中の窒素酸化物除去用触媒 |
DE3841990A1 (de) | 1988-12-14 | 1990-06-21 | Degussa | Verfahren zur reduktion von stickoxiden aus abgasen |
DE4003515A1 (de) * | 1990-02-06 | 1991-08-08 | Bayer Ag | Verfahren zur reduktion von in abgasen enthaltenen stickoxiden |
JP3246757B2 (ja) * | 1991-11-06 | 2002-01-15 | 三菱化学株式会社 | 窒素酸化物除去用触媒 |
JP4526907B2 (ja) * | 2004-09-15 | 2010-08-18 | エヌ・イーケムキャット株式会社 | 排ガス浄化用チタニア系酸化触媒、排ガス浄化用触媒構造体および排ガス浄化方法 |
JP4617253B2 (ja) * | 2005-12-26 | 2011-01-19 | エヌ・イーケムキャット株式会社 | 脱硝触媒、ハニカム構造型脱硝触媒、及びそれを用いた脱硝方法 |
JP5373255B2 (ja) * | 2006-05-29 | 2013-12-18 | 株式会社キャタラー | NOx還元触媒、NOx還元触媒システム、及びNOx還元方法 |
JP4294041B2 (ja) * | 2006-07-31 | 2009-07-08 | 本田技研工業株式会社 | NOx浄化触媒 |
CN100998945A (zh) * | 2006-12-31 | 2007-07-18 | 哈尔滨工业大学 | 负载型催化剂Fe2O3-CeO2-TiO2/γ-Al2O3及其制备方法 |
JP5110954B2 (ja) * | 2007-05-09 | 2012-12-26 | エヌ・イーケムキャット株式会社 | 選択還元型触媒を用いた排気ガス浄化触媒装置並びに排気ガス浄化方法 |
-
2008
- 2008-11-06 CN CN2008801292014A patent/CN102026722B/zh active Active
- 2008-11-06 EP EP08874279.6A patent/EP2286914B1/en active Active
- 2008-11-06 WO PCT/JP2008/070172 patent/WO2009139088A1/ja active Application Filing
- 2008-11-06 US US12/991,519 patent/US8551901B2/en active Active
- 2008-11-06 JP JP2010511856A patent/JP5464669B2/ja active Active
-
2014
- 2014-01-17 JP JP2014006416A patent/JP5774143B2/ja active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03270733A (ja) * | 1990-03-20 | 1991-12-02 | Nippon Shokubai Co Ltd | 窒素酸化物除去用触媒 |
JPH08131828A (ja) * | 1994-11-15 | 1996-05-28 | Nkk Corp | 窒素酸化物除去用触媒およびこれを用いた窒素酸化物の 除去方法 |
JP2005177570A (ja) | 2003-12-17 | 2005-07-07 | Ne Chemcat Corp | 高温特性に優れるscr触媒 |
JP2005246341A (ja) * | 2004-03-08 | 2005-09-15 | Babcock Hitachi Kk | 窒素酸化物除去用触媒、その製造方法、および該触媒を用いた窒素酸化物の除去方法 |
JP2006305423A (ja) | 2005-04-26 | 2006-11-09 | Toyota Central Res & Dev Lab Inc | NOx選択還元触媒 |
JP2008080195A (ja) * | 2006-09-26 | 2008-04-10 | Tosoh Corp | 高シリカβ型ゼオライトからなる炭化水素吸着剤 |
JP2008081348A (ja) * | 2006-09-27 | 2008-04-10 | Tosoh Corp | 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 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2286914A4 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015161627A1 (zh) * | 2014-04-24 | 2015-10-29 | 同济大学 | 一种用于400℃~600℃烟气蜂窝脱硝催化剂及其制备方法 |
CN105013523A (zh) * | 2014-04-24 | 2015-11-04 | 同济大学 | 一种用于400℃~600℃烟气蜂窝脱硝催化剂及其制备方法 |
JP2016043320A (ja) * | 2014-08-25 | 2016-04-04 | エヌ・イーケムキャット株式会社 | 尿素加水分解触媒及び尿素加水分解材料を用いた選択還元触媒 |
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