WO2008004452A1 - Matière de stockage d'oxygène - Google Patents
Matière de stockage d'oxygène Download PDFInfo
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- WO2008004452A1 WO2008004452A1 PCT/JP2007/062598 JP2007062598W WO2008004452A1 WO 2008004452 A1 WO2008004452 A1 WO 2008004452A1 JP 2007062598 W JP2007062598 W JP 2007062598W WO 2008004452 A1 WO2008004452 A1 WO 2008004452A1
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- WIPO (PCT)
- Prior art keywords
- cerium
- powder
- particles
- oxygen storage
- zirconium
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G25/00—Compounds of zirconium
- C01G25/02—Oxides
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- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
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- 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
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/40—Mixed oxides
- B01D2255/407—Zr-Ce mixed oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/12—Oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4525—Gas separation or purification devices adapted for specific applications for storage and dispensing systems
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- 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
- B01J23/63—Platinum group metals with rare earths or actinides
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- 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
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/85—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by XPS, EDX or EDAX data
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
- C01P2004/82—Particles consisting of a mixture of two or more inorganic phases two phases having the same anion, e.g. both oxidic phases
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S502/00—Catalyst, solid sorbent, or support therefor: product or process of making
- Y10S502/526—Sorbent for fluid storage, other than an alloy for hydrogen storage
Definitions
- the present invention relates to an oxygen storage material, and more particularly to an oxygen storage material suitable for use in an exhaust gas purification catalyst.
- a three-way catalyst in which a precious metal is supported on an inorganic oxide such as acid cerium has been widely used.
- the noble metal plays a role in promoting the reduction reaction of nitrogen oxides and the oxidation reaction of carbon monoxide and hydrocarbons.
- the inorganic oxide has the role of increasing the specific surface area of the noble metal and suppressing the sintering of the noble metal by dissipating the heat generated by the reaction.
- cerium oxide has an oxygen storage capacity and can optimize the previous reduction reaction and oxidation reaction.
- Japanese Examined Patent Publication No. 6-75675 discloses an exhaust gas purification catalyst containing a complex oxide of cerium and zirconium.
- Japanese Unexamined Patent Publication No. 2000-169148 describes the use of a complex oxide of cerium, zirconium and yttrium.
- exhaust gas discharged from an internal combustion engine is purified using an oxygen storage material having a complex oxide strength of cerium and at least one of praseodymium, lanthanum, yttrium and neodymium. It will be described.
- the three-way catalyst using the above complex oxide is used for a long time at a high temperature of 1000 ° C or more, for example.
- the composite oxide particles are difficult to grow, but noble metal particles grow. As the noble metal particles grow, the oxygen storage capacity of the composite oxide decreases. Disclosure of the invention
- An object of the present invention is to provide an oxygen storage material that exhibits an excellent oxygen storage capacity even when used for a long time under high temperature conditions.
- Second particles containing a composite oxide of alkaline earth element and zirconium, and a noble metal, and a part of the noble metal is in solid solution with the composite oxide contained in the second particle.
- An oxygen storage material that forms the body is provided.
- FIG. 1 is a diagram schematically showing an oxygen storage material according to one embodiment of the present invention.
- FIG. 2 is a conceptual diagram schematically showing a state change of the oxygen storage material of FIG. 1 under high temperature conditions.
- FIG. 3 is a graph showing an X-ray diffraction spectrum obtained for the powder produced in Example 1.
- FIG. 4 is an electron micrograph of the powder produced in Example 1.
- FIG. 5 is a graph showing an elemental analysis spectrum by EDX obtained for one particle in FIG.
- FIG. 6 is a graph showing an elemental analysis spectrum by EDX obtained for other particles in FIG. 4.
- FIG. 1 is a diagram schematically showing an oxygen storage material according to one embodiment of the present invention.
- This oxygen storage material 1 includes a plurality of first particles P1 and a plurality of second particles P2.
- first particle P1 and the second particle P2 are drawn one by one.
- the first particles P1 also have a complex oxide of cerium and zirconium or a complex oxide of zirconium and a rare earth element other than cerium and cerium. Typically, this composite oxide and a noble metal described later form a solid solution.
- the first particles P1 are less likely to grow by heating than the second particles P2. That is, the first particles P1 are more excellent in thermal stability than the second particles P2.
- the first particles PI carry the noble metal 13c.
- the noble metal 13c for example, platinum group elements such as platinum, palladium and rhodium can be used.
- the noble metal 13c one noble metal element may be used or a plurality of noble metal elements may be used.
- platinum (Pt) is used as the noble metal 13c.
- the second particle P2 includes a carrier 11, composite oxides 12a to 12c partially covering the surface, and a noble metal (not shown).
- the support 11 contains a rare earth element oxide as a main component.
- the carrier 11 can further contain, for example, zircoure (ZrO 2).
- Carrier 11 is composed of rare earth elements and zirco.
- -It may contain a complex oxide with um as the main component.
- the composite oxide 12a contains a composite oxide of a rare earth element and an alkaline earth element as a main component.
- the composite oxide 12b contains a composite oxide of zirconium and an alkaline earth element as a main component.
- the composite oxide 12c contains a composite oxide of a rare earth element, zirconium and an alkaline earth element as a main component.
- the rare earth element contained in the composite oxides 12a and 12c is the same as the rare earth element contained in the support 11, and the composite oxides 12a to 12c do not contain the same alkaline earth element.
- the composite oxides 12a to 12c contain the same noble metal as the noble metal 13c, and each of the composite oxides 12a to 12c forms a solid solution with the noble metal.
- the carrier 11 contains ceria (CeO 2) as a main component, and is a composite oxide.
- the complex oxide 12a is composed of a complex oxide represented by the chemical formula: BaCeO, and the complex oxide 12b is represented by the chemical formula:
- the complex acidity represented by BaZrO is the chemical formula: Ba (Zr, Ce) 0
- the noble metal contained in the composite oxides 12a to 12c is platinum (Pt). That is, cerium is used as the rare earth element, barium is used as the alkaline earth element, and platinum is used as the noble metal.
- the solid solution of the composite oxide 12a and platinum can be expressed, for example, by the formula: Ba (Ce, Pt) 0.
- the solid solution of the compound oxide 12b and platinum can be represented by, for example, the chemical formula: Ba (Zr, Pt) 0,
- the solid solution of complex oxide 12c and platinum can be expressed, for example, by the formula: Ba (Zr, Ce, Pt) 0
- the second particles P2 carry the noble metal 13a.
- Precious metal 13a is composed of precious metal 13c and composite It is the same as the noble metal contained in the oxides 12a to 12c.
- the second particle P2 may not carry the noble metal 13a.
- the oxygen storage material 1 can be used as an exhaust gas purifying catalyst for purifying exhaust gas exhausted from a combustion engine such as a gasoline engine or a diesel engine, or a part thereof.
- a pellet catalyst containing the oxygen storage material 1 may be manufactured and used as a catalyst for exhaust gas purification.
- a monolith catalyst produced by coating a slurry containing the oxygen storage material 1 on a monolith cam carrier may be used as an exhaust gas purification catalyst.
- This oxygen storage material 1 exhibits a reversible state change when the composition of the atmosphere is changed under high temperature conditions. This will be described using an example in which the oxygen storage material 1 is used as an exhaust gas purification catalyst.
- FIG. 2 is a conceptual diagram schematically showing a state change of the oxygen storage material of FIG. 1 under a high temperature condition.
- the state denoted as “Lean” indicates oxygen storage when exposed to a high oxygen concentration atmosphere at a high temperature condition of 1000 ° C. to 1200 ° C., for example, when fuel supply to the engine is stopped.
- the state shown by Material 1 is shown.
- the state described as “Rich” is an oxygen storage system when exposed to a low oxygen concentration atmosphere under high temperature conditions of, for example, 1000 ° C. to 1200 ° C., for example, when a large amount of fuel is continuously supplied to the engine. This shows the state of material 1.
- the first particles P 1 and the second particles P 2 store oxygen.
- Precious metals 13c and 13a play a role in promoting oxygen storage in particles P1 and P2, respectively.
- the oxygen storage material 1 changes from a state denoted as “Lean” to a state denoted as “Rich”. Specifically, the composite oxide 12a to 12c force platinum is deposited, and the deposited platinum forms a noble metal 13b on the surface of the composite oxide 12a to 12c.
- the noble metal 13b is much smaller than the noble metals 13a and 13c.
- the dimensions of the noble metals 13a and 13c are several lOnm, whereas the dimensions of the noble metals 13b are several nm or less. is there.
- the oxygen storage material 1 in FIG. 1 shows a reversible state change when the composition of the atmosphere is changed under a high temperature condition.
- a noble metal 13b having a small size is formed on the surfaces of the composite oxides 12a to 12c.
- the oxygen storage material 1 is unlikely to cause a decrease in oxygen storage capacity. The reason is estimated as follows.
- the oxygen storage material 1 in FIG. 1 forms a noble metal 13b having a small size on the surface of the composite oxides 12a to 12c each time the oxygen concentration in the atmosphere decreases. .
- the oxygen concentration in the exhaust gas changes relatively frequently. Therefore, the dimension of the noble metal 13b does not increase on the composite oxides 12a to 12c.
- the noble metal 13b having a smaller size is more easily vaporized than the noble metals 13a and 13c having a larger size.
- the evaporated noble metal deposits on the particles P1 and P2 as small-sized particles. Therefore, the oxygen storage material 1 in FIG. 1 is less likely to cause a decrease in oxygen storage capacity than an oxygen storage material that does not contain the second particles P2.
- the oxygen storage material 1 from which the first particles P1 are omitted is exposed to a high temperature atmosphere, the dimension of the noble metal 13b does not increase.
- the second particle P2 is inferior in thermal stability to the first particle P1. Therefore, the oxygen storage material that does not contain the first particles P1 tends to cause the growth of the second particles P2. As the second particle P2 grows, its specific surface area force decreases. Therefore, an oxygen storage material that does not contain the first particles P1 tends to cause a decrease in oxygen storage capacity.
- the oxygen storage material 1 in FIG. 1 includes the first particles P1 having excellent thermal stability in addition to the second particles P2.
- the first particles P1 serve to suppress the growth of the second particles P2. Therefore, the oxygen storage material 1 in FIG. 1 is less likely to cause a decrease in oxygen storage capacity than an oxygen storage material that does not contain the first particles P1.
- the first particles P1 for example, one or more of praseodymium, lanthanum, yttrium, and neodymium can be used as a rare earth element other than cerium.
- the atomic ratio of cerium to the sum of cerium and zirconium is, for example, in the range of 0.05 to 0.7.
- the atomic ratio of cerium to the sum of cerium, a rare earth element other than cerium and zirconium is, for example, 0.
- the atomic ratio of rare earth elements other than cerium to zirconium is, for example, in the range of 0.06 to 0.27, and typically in the range of 0.11 to 0.25.
- the second particle P2 for example, one or more of cerium, lanthanum, praseodymium, and neodymium can be used as the rare earth element.
- the alkaline earth element for example, one or more of barium, strontium, calcium and magnesium can be used.
- the atomic ratio of the alkaline earth element to the sum of the rare earth element and zirconium is, for example, 0.1 atomic% or more, and typically 5 atomic% or more.
- the atomic ratio is, for example, 15 atomic% or less, and typically 10 atomic% or less.
- this atomic ratio is small, the volume ratio of the composite oxides 12a to 12c to the support 11 is small. Therefore, the effect of suppressing the growth of noble metal particles may be insufficient. If this atomic ratio is excessively increased, the thermal stability of the second particles P2 may be insufficient.
- the weight ratio of the first particles P1 and the second particles P2 is, for example, in the range of 99Z1 to 1Z99, and typically in the range of 80Z20 to 40Z60. If this ratio is small, the effect of suppressing the growth of the second particles P2 may be insufficient. If this ratio is large, the effect of suppressing the growth of noble metal particles may be insufficient.
- platinum group elements such as platinum, palladium, and rhodium can be used.
- Each of the noble metals 13a to 13c may use a single element or a plurality of elements.
- the precious metal content of the oxygen storage material 1 is, for example, in the range of 0.001 to 5% by weight, and typically in the range of 0.1 to 1% by weight.
- the precious metal content is small, the precious metal has a small effect of promoting the oxygen storage of the particles P1 and P2.
- Precious metal content When is large, noble metal particles are likely to grow.
- the oxygen storage material 1 can be produced, for example, by the following method.
- first particles P1 that also have the complex acidity of cerium and zirconium prepare a solution of cerium salt and zirconium salt.
- a solution of a cerium salt and a salt of a rare earth element other than cerium and a zirconium salt is prepared.
- ammonium hydroxide is dropped into the solution to cause coprecipitation. Thereafter, the precipitate is separated from the solution and washed and dried.
- the dried precipitate is then calcined in an oxidizing atmosphere.
- the calcination temperature is, for example,
- the calcined product is pulverized and fired in an oxidizing atmosphere.
- the firing temperature is, for example, in the range of 700 ° C to 1000 ° C. In this way, the first particle P1 is obtained.
- a solution of a rare earth element salt and a zirconium salt is prepared. Next, for example, hydroxyammonium hydroxide is dropped into the solution to cause coprecipitation. The precipitate is then separated from the solution and washed and dried.
- the dried precipitate is calcined in an acidic atmosphere.
- the calcination temperature is, for example, 4
- the calcined product is pulverized and fired in an oxidizing atmosphere.
- the firing temperature is, for example, in the range of 700 ° C to 1000 ° C.
- the carrier 11 is obtained.
- the carrier 11 is dispersed in a noble metal salt solution, and this dispersion is filtered. Subsequently, the filter cake is sequentially dried and fired.
- the firing temperature is, for example, in the range of 300 ° C to 700 ° C. In this way, the support 11 is loaded with the noble metal.
- the carrier 11 carrying the noble metal is added to the alkaline earth salt solution. Sarako, this slurry is heated to sufficiently remove the liquid. In this way, the alkaline earth element is supported on the support 11.
- the method of supporting the alkaline earth element on the support 11 For example, precious metal
- a method of impregnating the carrier 11 supporting the alkaline earth salt solution, a method using coprecipitation, a method using an alkoxide of an alkaline earth metal, or the like may be used.
- the carrier 11 supporting the noble metal and the alkaline earth element is fired in an oxidizing atmosphere.
- the firing temperature is, for example, in the range of 700 ° C to 1000 ° C.
- the composite oxides 12a to 12c are generated, and a solid solution of the composite oxides 12a to 12c and the noble metal is generated to obtain the second particles P2 carrying the noble metal 13a.
- the first particles P1 are dispersed in a precious metal salt solution, and the dispersion is filtered. Subsequently, the filter cake is sequentially dried and fired.
- the firing temperature is, for example, in the range of 300 ° C to 700 ° C. In this way, the precious metal 13c is supported on the first particles P1.
- the first particles P1 and the second particles P2 are mixed. In this way, the oxygen storage material 1 is obtained.
- powder A was produced by the following method.
- the molar ratio of zirconium to yttrium nitrate was 100: 90: 20.
- the coprecipitation product was calcined in air at 500 ° C for 3 hours. Thereafter, the calcined product was pulverized in a mortar, and the resulting powder was calcined in the atmosphere at 800 ° C. for 5 hours.
- the slurry was subjected to suction filtration.
- the filtrate was subjected to inductively coupled radio frequency plasma (ICP) spectroscopy analysis and found that almost all of the platinum in the slurry was present in the filter cake.
- ICP inductively coupled radio frequency plasma
- the filter cake was dried at 110 ° C for 12 hours. Subsequently, this was fired at 500 ° C. for 1 hour in the air. As described above, powder A was produced.
- powder B was produced by the following method.
- a 10% by weight aqueous ammonium hydroxide (NH OH) solution was added dropwise at room temperature.
- the coprecipitation product was calcined in air at 500 ° C for 3 hours. Thereafter, the calcined product was pulverized in a mortar, and the resulting powder was calcined in the atmosphere at 800 ° C. for 5 hours.
- the powder thus obtained was examined for crystal structure using an X-ray diffractometer. As a result, it was confirmed that this powder was composed of a complex oxide of cerium and zirconium. The specific surface area of this powder was 90 m 2 / g.
- the filter cake was dried at 110 ° C for 12 hours. Then, this is done in the atmosphere at 500 ° C Baked for 1 hour. As a result, platinum was supported on a powder made of a complex oxide of cerium and zirconium.
- barium acetate was dissolved in lOOmL of deionized water.
- 50 g of a powder having a composite oxide strength of cerium and zirconium carrying platinum was weighed and added to an aqueous barium acetate solution.
- the concentration of the barium acetate aqueous solution was adjusted so that, in powder B, the atomic ratio of the sum of cerium and zirconium to barium was 100: 10.
- the dispersion was then heated to remove moisture.
- a barium compound was further supported on a powder made of a composite oxide of cerium and zirconium supporting platinum.
- Powder B was produced as described above.
- this powder B is composed of a composite oxide represented by the chemical formula: BaZrO and a composite oxide represented by the chemical formula: Ba (Ce, Zr) 0.
- powder A and powder B were mixed using a mortar.
- the weight ratio of powder A and powder B was 70:30.
- this mixture is referred to as powder AB1.
- Powder AB1 was subjected to X-ray diffraction analysis. A scanning electron microscope was used to take a micrograph of powder AB1, and an elemental analysis using energy dispersive X-ray analysis (EDX) was performed.
- EDX energy dispersive X-ray analysis
- FIG. 3 is a graph showing an X-ray diffraction spectrum obtained for the powder AB1.
- the horizontal axis indicates the diffraction angle
- the vertical axis indicates the diffraction intensity.
- Reference symbol PK1 indicates the position of a diffraction peak derived from powder A
- reference symbols PK2a to PK2c indicate the positions of diffraction peaks derived from powder B.
- FIG. 4 is an electron micrograph of powder AB1.
- FIG. 5 is a graph showing an elemental analysis spectrum by EDX obtained for the particle Pa in FIG.
- FIG. 6 is a graph showing an elemental analysis spectrum by EDX obtained for the particle Pb of FIG. 5 and 6, the horizontal axis represents the characteristic X-ray energy, and the vertical axis represents the characteristic X-ray intensity.
- the metal element contained in the powder, the crystal structure of the powder, and the like can be specified. Further, by observing the state change described with reference to FIG. 2, it is possible to identify particles in which the noble metal and the complex oxide form a solid solution.
- Powder A and powder B were mixed using a mortar.
- the weight ratio of powder A and powder B was 90:10.
- this mixture is referred to as powder AB2.
- Powder A and powder B were mixed using a mortar.
- the weight ratio of powder A and powder B was 50:50.
- this mixture is referred to as powder AB3.
- Powder A and powder B were mixed using a mortar.
- the weight ratio of powder A and powder B was 30:70.
- this mixture is referred to as powder AB4.
- each powder was weighed and each was placed on a platinum dish.
- each powder was heated up to 500 ° C. while flowing air at a flow rate of 200 mLZ, and then maintained at 500 ° C. for 40 minutes. Thereafter, the weight of each powder was measured.
- each powder is heated to 500 ° C. While maintaining, a reducing gas made by adding 10% hydrogen to nitrogen was circulated for 90 minutes at a flow rate of 150 mLZ. Thereafter, the weight of each powder was measured.
- powders AB1 to AB4 had a larger oxygen storage capacity than powders A and B. That is, powders AB1 to AB4 exhibited superior oxygen storage capacity when used under high temperature conditions for a long time as compared with powders A and B.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN2007800257042A CN101484240B (zh) | 2006-07-06 | 2007-06-22 | 储氧材料 |
JP2008523644A JP4938013B2 (ja) | 2006-07-06 | 2007-06-22 | 酸素貯蔵材料 |
EP07767407A EP2039422A4 (en) | 2006-07-06 | 2007-06-22 | OXYGEN STORAGE MATERIAL |
US12/307,571 US8993475B2 (en) | 2006-07-06 | 2007-06-22 | Oxygen storage material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006187137 | 2006-07-06 | ||
JP2006-187137 | 2006-07-06 |
Publications (1)
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WO2008004452A1 true WO2008004452A1 (fr) | 2008-01-10 |
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PCT/JP2007/062598 WO2008004452A1 (fr) | 2006-07-06 | 2007-06-22 | Matière de stockage d'oxygène |
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US (1) | US8993475B2 (ja) |
EP (1) | EP2039422A4 (ja) |
JP (1) | JP4938013B2 (ja) |
CN (1) | CN101484240B (ja) |
WO (1) | WO2008004452A1 (ja) |
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JPWO2015087781A1 (ja) * | 2013-12-09 | 2017-03-16 | 株式会社キャタラー | 排ガス浄化用触媒 |
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CN105983403B (zh) * | 2015-02-09 | 2019-01-01 | 有研稀土新材料股份有限公司 | 一种铈锆复合氧化物、其制备方法及催化剂的应用 |
WO2019043346A1 (fr) | 2017-09-01 | 2019-03-07 | Rhodia Operations | Oxyde mixte a base de cerium et de zirconium |
WO2019088302A1 (ja) * | 2017-11-06 | 2019-05-09 | 新日本電工株式会社 | 酸素吸放出材料、触媒、排ガス浄化システム、および排ガス処理方法 |
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Also Published As
Publication number | Publication date |
---|---|
US20100004123A1 (en) | 2010-01-07 |
CN101484240B (zh) | 2012-10-24 |
US8993475B2 (en) | 2015-03-31 |
EP2039422A4 (en) | 2011-06-22 |
JPWO2008004452A1 (ja) | 2009-12-03 |
EP2039422A1 (en) | 2009-03-25 |
CN101484240A (zh) | 2009-07-15 |
JP4938013B2 (ja) | 2012-05-23 |
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