WO2006008948A1 - 排気ガス浄化用触媒及びその製造方法 - Google Patents
排気ガス浄化用触媒及びその製造方法 Download PDFInfo
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- WO2006008948A1 WO2006008948A1 PCT/JP2005/012325 JP2005012325W WO2006008948A1 WO 2006008948 A1 WO2006008948 A1 WO 2006008948A1 JP 2005012325 W JP2005012325 W JP 2005012325W WO 2006008948 A1 WO2006008948 A1 WO 2006008948A1
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- Prior art keywords
- exhaust gas
- catalyst
- supported
- noble metal
- refractory inorganic
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Classifications
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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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- 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
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
-
- 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/656—Manganese, technetium or rhenium
- B01J23/6562—Manganese
-
- 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
- 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
- B01J37/0244—Coatings comprising several layers
-
- 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
- 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
- B01J37/0248—Coatings comprising impregnated particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/10—Noble metals or compounds thereof
- B01D2255/102—Platinum group metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/40—Mixed oxides
-
- 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
- F01N2370/00—Selection of materials for exhaust purification
- F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
-
- 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
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
-
- 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 an exhaust gas purifying catalyst and a method for producing the same, and more specifically, exhibits the desired catalytic performance by suppressing the reaction 'decomposition of a catalyst component comprising a specific tetragonal complex oxide.
- the present invention relates to an exhaust gas purifying catalyst that can be produced and a method for producing the same.
- Exhaust gas discharged from internal combustion engines such as automobiles contains harmful components such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO). Therefore, three-way catalysts that purify and detoxify these harmful components have been used in the past.
- harmful components such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO). Therefore, three-way catalysts that purify and detoxify these harmful components have been used in the past.
- a three-way catalyst As such a three-way catalyst, a first layer provided on a support substrate, containing at least alumina and having Zro added or supported on a surface layer, and a velovskite type provided on the first layer Structure
- Patent Document 1 JP-A-7-80311
- A represents at least one selected from the group consisting of Ca, Sr and Ba
- B represents at least one selected from the group consisting of Mn, Fe, Ti, Sn and V
- An aqueous solution prepared by adding a complex oxide such as manganese (II) nitrate hexahydrate and calcium nitrate tetrahydrate to a molar ratio of 1: 2 is dropped into an aqueous ammonium carbonate solution.
- Precursor precipitation It is made of Ca MnO, which is obtained by filtering the precipitate, drying at about 120 ° C, and calcining at about 800 ° C. It has high low-temperature activity, excellent heat resistance, and stable exhaust gas. Purifying performance
- the present invention has been made in view of the circumstances as described above, and even if the tetragonal complex oxide is obtained by the above-mentioned mixed drying firing, the tetragonal complex oxide is obtained.
- the purpose of the present invention is to provide an exhaust gas purifying catalyst capable of exhibiting the desired catalytic performance by suppressing the reaction and decomposition of the catalyst component comprising the product, and a method for producing the same.
- a tetragonal complex oxide represented by O at least the surface layer being composed of MgAl 2 O
- the present invention has been completed by finding that the above object can be achieved by coexisting with a refractory inorganic oxide.
- the exhaust gas purifying catalyst of the present invention has the general formula A BO (where A is Ca, Sr and Ba
- a tetragonal complex oxide represented by at least one selected from the group consisting of Mn, Fe, Ti, Sn and V), and at least one selected from the group consisting of And a refractory inorganic oxide whose surface layer is composed of MgAl 2 O and the tetragonal complex oxide.
- the exhaust gas purifying catalyst of the present invention comprises
- a first catalyst layer comprising a product, or a first catalyst layer serving as a catalyst for exhaust gas purification according to the present invention, and a noble metal component-supported refractory inorganic oxide supported on the first catalyst layer.
- a second catalyst layer consisting of
- the method for producing an exhaust gas purifying catalyst of the present invention includes alumina, basic magnesium carbonate, and a general formula A BO (where A is a group force consisting of Ca, Sr, and Ba, at least
- B represents a group force consisting of Mn, Fe, Ti, Sn, and V.
- At least one selected from the group consisting of tetragonal complex oxides A tetragonal complex acid which is coated on a carrier, dried, and fired at 300 to 600 ° C. for 1 to 6 hours, and the noble metal component is in a solid solution and supports the noble metal component or the noble metal component.
- the calcination product is used, or the calcined product after calcination is immersed in an aqueous solution of a basic noble metal salt to carry a predetermined amount of noble metal, and then calcined at 300 to 600 ° C.
- the method for producing an exhaust gas purifying catalyst of the present invention includes MgAl 2 O and a general formula A BO
- A represents at least one selected from the group force consisting of Ca, Sr and Ba
- B represents at least one selected from the group consisting of Mn, Fe, Ti, Sn and V
- the slurry containing a tetragonal complex oxide represented by the following formula is coated on a support made of ceramics or a metal material, dried, fired at 300 to 600 ° C. for 1 to 6 hours, and the noble metal component is solidified. Melting Be a body! / Use a tetragonal complex acid oxide that supports the metal or the precious metal component, or immerse the fired product after firing in an aqueous solution of a basic precious metal salt to support a predetermined amount of the precious metal. And then firing at 300 to 600 ° C.
- the exhaust gas purifying catalyst of the present invention is a catalyst comprising a tetragonal complex oxide even when used for purifying harmful components contained in high-temperature exhaust gas discharged from an internal combustion engine such as an automobile.
- the desired catalytic performance can be exhibited by suppressing the reaction 'decomposition of the components.
- FIG. 1 is a chart showing XRD results of the products obtained in Test Examples 1 to 5.
- A represents at least one selected from the group consisting of Ca, Sr and Ba
- B represents at least one selected from the group forces selected from Mn, Fe, Ti, Sn and V forces
- Examples of the crystalline complex oxide include Ca MnO, Sr MnO, Sr FeO, Ba SnO, Sr VO and the like.
- Ca MnO is particularly preferable in terms of catalytic activity.
- It may be a tetragonal complex oxide obtained by firing or a tetragonal complex oxide obtained by the above-mentioned mixed dry firing, but it can be obtained by the above described mixed dry firing. A remarkable effect is achieved in the case of a tetragonal complex oxide.
- the tetragonal complex oxide has a K NiF type structure, that is, a tetragonal structure, whereas the perovskite complex oxide is cubic. In the lattice
- perovskite structures and OSC materials (CeO and ZrO and
- the exhaust gas purifying catalyst of the present invention such a tetragonal complex oxide is used, so that the oxygen concentration is not high based on the change in the exhaust gas atmosphere, that is, the stoichiometric air-fuel ratio.
- Ten Oxygen entry and exit is relatively easy in response to changes in the oxygen concentration over a wide range from a rich reducing atmosphere (rich atmosphere) to an oxygen-excess oxidizing atmosphere (lean atmosphere).
- tetragonal complex oxides are excellent in heat resistance, even when an exhaust gas purifying catalyst is used in a high temperature range, it exhibits a very high oxygen storage capacity and catalytic activity.
- the exhaust gas purification performance can be improved.
- At least the surface layer is composed of MgAl 2 O.
- the inside of the refractory inorganic oxide is alumina and the surface layer is MgAl 2 O 3
- the entire refractory inorganic oxide is composed of MgAl 2 O.
- the effect in the present invention is that the above-mentioned tetragonal complex oxide and the refractory inorganic acid at least the surface layer of which is composed of MgAl 2 O.
- noble metal components such as rhodium, palladium and platinum are solid solution or supported in the tetragonal complex oxide. Or supported by the above-mentioned refractory inorganic oxide.
- the tetragonal complex oxide in which the noble metal component is in a solid solution in the tetragonal complex oxide has the general formula A B C O (
- A represents at least one selected from the group force consisting of Ca, Sr and Ba
- B represents at least one selected from the group force selected from Mn, Fe, Ti, Sn and V
- C represents a noble metal
- X is 0.01 to 0.5
- the tetragonal complex oxide in such a state is It can be obtained by immersing the tetragonal composite oxide in a basic noble metal salt aqueous solution and supporting a predetermined amount of noble metal, followed by firing at 300 to 600 ° C.
- the calcined product containing the above tetragonal complex oxide in an aqueous solution of a basic noble metal salt, supporting a predetermined amount of noble metal, and then calcining at 300 to 600 ° C.
- the noble metal component is solid solution or supported in the tetragonal complex oxide, and the noble metal component is supported on the refractory inorganic oxide.
- the mixed state is equally effective as an exhaust gas purifying catalyst.
- the state in which the noble metal component is in solid solution in the tetragonal complex oxide is a noble metal component in which part of the element at the B site of the tetragonal complex oxide acts as a catalyst.
- a noble metal component in which part of the element at the B site of the tetragonal complex oxide acts as a catalyst.
- it is in a state where it is substituted with a palladium component, and as such a solid solution, for example, Ca Mn Pd O
- a noble metal component such as Pd
- X which represents the amount of the precious metal component in the solid solution
- x is preferably 0.01 to 0.5 in the tetragonal complex oxide of the general formula A B C O used for the exhaust gas purifying catalyst of the present invention.
- the exhaust gas purifying catalyst of the present invention comprises a tetragonal complex oxide as described above, a refractory inorganic oxide having at least a surface layer composed of MgAl 2 O, and a noble metal component. Also
- a first catalyst layer made of a product or a catalyst for exhaust gas purification of the present invention.
- a second catalyst layer comprising a noble metal component-supported refractory inorganic oxide supported on the first catalyst layer;
- the noble metal components may be different from each other in the kind of the noble metal component supported by each of the refractory inorganic acids.
- the shape of the carrier that also has ceramic or metal material power is not particularly limited, but in general, such as a hard cam, a plate, a pellet, etc. It is a shape, preferably a Hercam shape.
- the material of such a carrier include anolemina (Al 2 O 3), mullite (3A1 O—2SiO), cordierite (2M gO—2Al).
- Ceramics such as O-5SiO2
- metal materials such as stainless steel
- Jiraito material are particularly effective because the thermal expansion coefficient is extremely low and 1.0 X 10- 6 Z ° C.
- a layer comprising the above tetragonal complex oxide supported on a carrier having a ceramic or metal material strength and a refractory inorganic oxide having at least a surface layer composed of MgAl 2 O
- the exhaust gas purifying catalyst layer comprising a porous inorganic oxide and a noble metal component includes a refractory inorganic oxide containing the above tetragonal complex oxide and at least a surface layer made of MgAl 2 O.
- the exhaust gas purifying catalyst layer includes a calcined product containing the above tetragonal complex oxide and a refractory inorganic oxide whose surface layer is composed of MgAl 2 O on the support.
- the layer After the layer is formed, it can also be formed by immersing in a basic noble metal salt aqueous solution and supporting a predetermined amount of noble metal, followed by firing at 300 to 600 ° C.
- a layer of a refractory inorganic oxide carrying a precious metal component for example, a layer of porous alumina carrying a platinum component, immerses the refractory inorganic oxide in a basic precious metal salt aqueous solution and supports a predetermined amount of precious metal.
- the noble metal component is supported on the refractory inorganic oxide by firing at ⁇ 600 ° C, the slurry containing the noble metal component-supported refractory inorganic oxide is used.
- the porcelain and at least the surface layer are composed of MgAl O
- the noble metal component-supported refractory inorganic oxide layer is formed by forming a refractory inorganic oxide layer and then immersing it in a basic noble metal salt solution to support a predetermined amount of noble metal, and then 300 to 600 It can also be formed by baking at ° C.
- the tetragonal complex oxide is Ca MnO.
- the precious metal component is rhodium, palladium or platinum
- the refractory inorganic oxide is Al O, SiO, ZrO, CeO, CeO—ZrO composite oxide or
- the exhaust gas purifying catalyst of the present invention can obtain excellent heat resistance even when used in a wide range from a low temperature range immediately after starting an internal combustion engine such as an automobile to a high temperature range during continuous operation. In addition, stable exhaust gas purification performance with high low-temperature activity can be obtained.
- the method for producing an exhaust gas purifying catalyst of the present invention comprises alumina, basic magnesium carbonate and a general formula A BO (wherein A is a group force consisting of Ca, Sr and Ba, at least one selected.
- a slurry containing a tetragonal complex oxide represented by the following formula: B or B represents a group force consisting of Mn, Fe, Ti, Sn, and V). It is applied onto a carrier in the form of a hard cam, plate, pellet, etc., dried and fired at 300 to 600 ° C. for 1 to 6 hours, and the precious metal component is used as a solid solution or a precious metal component.
- B or B represents a group force consisting of Mn, Fe, Ti, Sn, and V. It is applied onto a carrier in the form of a hard cam, plate, pellet, etc., dried and fired at 300 to 600 ° C. for 1 to 6 hours, and the precious metal component is used as a solid solution or a precious metal component.
- A represents at least one selected from the group force consisting of Ca, Sr and Ba
- B represents at least one selected from the group consisting of Mn, Fe, Ti, Sn and V.
- a slurry containing a tetragonal complex oxide represented by a seed) is applied onto a carrier in the form of a ceramic, a metal material, a hard cam, a plate, a pellet or the like, dried, and 300 to 600 Calcination for 1 to 6 hours at ° C, and the precious metal component forms a solid solution or supports the precious metal component, and uses a tetragonal complex acid silicate or a fired product after firing Is immersed in an aqueous solution of a basic noble metal salt, and after a predetermined amount of noble metal is supported, firing is performed at 300 to 600 ° C.
- MnCO powder and CaCO powder are stirred and mixed in pure water so that the molar ratio is 1: 2.
- MnO production was confirmed by XRD measurement.
- a slurry containing a quantity ratio of 1 was prepared. Each of the obtained slurries was dried at 120 ° C and calcined at 450 ° C for 2 hours to obtain a calcined product. Next, Ca MnO in these fired products
- a slurry containing was prepared.
- the obtained slurry was dried at 120 ° C. and calcined at 450 ° C. for 2 hours to obtain a calcined product.
- the reaction 'decomposability of Ca MnO in this fired product is examined.
- each particle has become MgAl 2 O by reaction with basic magnesium carbonate,
- the reaction decomposition of O is suppressed.
- the surface of each particle of alumina powder is MgA
- Ca is not coated with 1 O or incompletely coated with MgAl O.
- MnO is reactively decomposed to produce CaMnO, and the expected catalytic performance cannot be expected.
- the components were supported on the surface of Ca MnO, and some of them were in solid solution in Ca MnO.
- a slurry containing 2 4 and MgAl 2 O powder was prepared and the slurry was transferred to a 600 cell / inch 2 ha
- wash coating was applied to the surface of the cam-shaped cordierite carrier. Thereafter, it was dried at about 120 ° C. and calcined at about 500 ° C. to form a first catalyst layer.
- a slurry containing platinum-supported alumina obtained by supporting a platinum component on porous alumina was wash-coated, dried, and calcined at about 500 ° C to be second.
- a catalyst layer was formed.
- a slurry containing rhodium-supported alumina obtained by supporting the rhodium component on porous alumina was wash-coated, dried, and calcined at about 500 ° C. to be third catalyst layer.
- the exhaust gas purifying catalyst of the present invention was obtained.
- the exhaust gas purifying catalyst shown in Table 1 was prepared by adopting a method similar to the method described in Example 1.
- Example 4 C a aMn i-wholeP d ⁇ O ⁇ + Mg A 1, c P t / A 1 sOs 0- 2] ⁇ . 0
- Example 5 S r F e C + Mg A l ⁇ O ⁇ P t / A 1 3 0 3 Rb / A 1 ⁇ 0 3 0- 2 0. 2
- Example 6 S r ⁇ F e .... P d x O ⁇ + Mg AI, c one 1. 0
- Example 7 S re i- 3 ⁇ 4 P d C + Mg A ⁇ o 4 P ⁇ / ⁇ 1 ⁇ 0 3 0- 2 1.
- 0-Example 8 S re ix P dO ⁇ + Mg A 1: ⁇ P t / AI sOa R h / AO ⁇ 0. 2 1 0 0. 2 Note) x of the composite oxide in the first catalyst layer is all 0.05.
- In was ⁇ Ka ⁇ the amount of palladium nitrate corresponding to 5 mol 0/0 manganese. Thereafter, it was dried at about 120 ° C. and calcined at about 1100 ° C. to obtain Ca MnO powder.
- the palladium component was supported on the surface of Ca MnO, and a part of the palladium component was formed into a solid solution in Ca MnO. The production of Ca MnO was confirmed by XRD measurement.
- a slurry containing Ca MnO powder and porous alumina powder in which at least a part of the palladium component obtained above is in a solid solution is prepared, and this slurry is formed into a Herkam shape of 600 cells / inch 2 Wash cord on the surface of the cordierite carrier. Then about 120
- a slurry containing platinum-supported alumina obtained by supporting a platinum component on porous alumina is wash-coated on this first catalyst layer, dried, fired at about 500 ° C., and then second-coated. Touch A medium layer was formed. Further, on this second catalyst layer, a slurry containing rhodium-supported alumina obtained by supporting the rhodium component on porous alumina was wash-coated, dried, and dried.
- a catalyst for exhaust gas purification for comparison was obtained by calcining at 500 ° C. to form a third catalyst layer.
- Example 1 The exhaust gas purifying catalysts of Example 1 and Comparative Example 1 were each mounted on a 2000 cc engine, and heat treatment was performed at 950 ° C for 100 hours under the condition that AZF was in the range of 13.6 to 15.6. did. Both catalysts thus heat-treated were installed in the exhaust passage of a vehicle equipped with a 660cc engine, and the exhaust gas amount (g / km) when running in the 10 ⁇ 15 mode was measured. The results are shown in Table 2.
- the above-mentioned tetragonal complex oxide was able to maintain the desired catalytic performance.
- the reaction 'decomposition occurred and the catalytic activity decreased.
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Abstract
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JP2004210367A JP3786666B2 (ja) | 2004-07-16 | 2004-07-16 | 排気ガス浄化用触媒及びその製造方法 |
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WO2015159403A1 (ja) * | 2014-04-17 | 2015-10-22 | 三井金属鉱業株式会社 | 排気ガス浄化用触媒組成物及び排気ガス浄化触媒 |
JP6181260B1 (ja) * | 2016-09-13 | 2017-08-16 | 田中貴金属工業株式会社 | 排ガス浄化用の触媒組成物及び排ガス浄化触媒 |
RU2712124C1 (ru) * | 2019-07-22 | 2020-01-24 | Федеральное государственное бюджетное учреждение науки Ордена Трудового Красного Знамени Институт химии силикатов им. И.В. Гребенщикова Российской академии наук (ИХС РАН) | СПОСОБ ПОЛУЧЕНИЯ КОМПОЗИЦИОННЫХ НАНОКРИСТАЛЛИЧЕСКИХ МЕЗОПОРИСТЫХ ПОРОШКОВ В СИСТЕМЕ CeO2(ZrO2)-Al2O3 ДЛЯ ТРЕХМАРШРУТНЫХ КАТАЛИЗАТОРОВ |
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2004
- 2004-07-16 JP JP2004210367A patent/JP3786666B2/ja not_active Expired - Fee Related
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2005
- 2005-07-04 WO PCT/JP2005/012325 patent/WO2006008948A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS52150395A (en) * | 1976-06-09 | 1977-12-14 | Nippon Soken | Exhaust gas scrubbing catalyst compositions |
US5906958A (en) * | 1995-10-14 | 1999-05-25 | Samsung Electro-Mechanics Co., Ltd. | Catalyst for purifying automobile exhausts and method of manufacturing the catalyst |
JP2000202245A (ja) * | 1999-01-14 | 2000-07-25 | Hitachi Ltd | 内燃機関の排ガス浄化方法,排ガス浄化触媒及び排ガス浄化装置 |
WO2004089538A1 (ja) * | 2003-04-10 | 2004-10-21 | Mitsui Mining & Smelting Co. Ltd. | 排気ガス浄化用触媒及び正方晶系複合酸化物の製造方法 |
JP2004359540A (ja) * | 2003-05-15 | 2004-12-24 | Honda Motor Co Ltd | K2NiF4型複合酸化物及び排ガス浄化触媒 |
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