Composite oxide material and exhaust gas purifying catalyst using the same
US-2015273437-A1 · Oct 1, 2015 · US
Oxygen storage material and method of producing the same
US10220368B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10220368-B2 |
| Application number | US-201715462984-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 20, 2017 |
| Priority date | Mar 24, 2016 |
| Publication date | Mar 5, 2019 |
| Grant date | Mar 5, 2019 |
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Abstract
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An oxygen storage material comprises three pyrochlore-type composite oxides which are a ceria-zirconia composite oxide, a lanthana-zirconia composite oxide, and a ceria-zirconia-lanthana composite oxide, and which coexist together, wherein the oxygen storage material contains: first secondary particles made of the pyrochlore-type ceria-zirconia composite oxide and the pyrochlore-type ceria-zirconia-lanthana composite oxide; and second secondary particles made of the pyrochlore-type lanthana-zirconia composite oxide and the pyrochlore-type ceria-zirconia-lanthana composite oxide.
First claim
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What is claimed is: 1. An oxygen storage material comprising three pyrochlore-type composite oxides which are a ceria-zirconia composite oxide, a lanthana-zirconia composite oxide, and a ceria-zirconia-lanthana composite oxide, and which coexist together, wherein the oxygen storage material contains: first secondary particles made of the pyrochlore-type ceria-zirconia composite oxide and the pyrochlore-type ceria-zirconia-lanthana composite oxide; and second secondary particles made of the pyrochlore-type lanthana-zirconia composite oxide and the pyrochlore-type ceria-zirconia-lanthana composite oxide. 2. The oxygen storage material according to claim 1 , wherein in the entire oxygen storage material, a content of cerium relative to a total amount of cerium and lanthanum in the pyrochlore-type ceria-zirconia-lanthana composite oxide is 0.30 to 0.90 in an atomic ratio [Ce/(Ce+La)]. 3. The oxygen storage material according to claim 2 , wherein in the entire oxygen storage material, a content of cerium relative to a total amount of cerium and lanthanum in the pyrochlore-type ceria-zirconia-lanthana composite oxide is 0.50 to 0.90 in an atomic ratio [Ce/(Ce+La)]. 4. The oxygen storage material according to claim 1 , wherein in the entire oxygen storage material, a content of cerium relative to a total amount of cerium and zirconium in the pyrochlore-type ceria-zirconia composite oxide is 0.40 to 0.70 in an atomic ratio [Ce/(Ce+Zr)]. 5. The oxygen storage material according to claim 1 , wherein in the entire oxygen storage material, a content of lanthanum relative to a total amount of lanthanum and zirconium in the pyrochlore-type lanthana-zirconia composite oxide is 0.40 to 0.60 in an atomic ratio [La/(La+Zr)]. 6. The oxygen storage material according to claim 1 , wherein a content ratio of the pyrochlore-type ceria-zirconia composite oxide is 30 to 80% by mass, a content ratio of the pyrochlore-type lanthana-zirconia composite oxide is 10 to 40% by mass, and a content ratio of the pyrochlore-type ceria-zirconia-lanthana composite oxide is 10 to 60% by mass, relative to a total amount of the pyrochlore-type ceria-zirconia composite oxide, the pyrochlore-type lanthana-zirconia composite oxide, and the pyrochlore-type ceria-zirconia-lanthana composite oxide. 7. A method for producing an oxygen storage material comprising: performing a reduction treatment at a temperature of 1200 to 1600° C. on a raw material mixture containing a pyrochlore-type ceria-zirconia composite oxide and a lanthana-zirconia composite oxide in a mass ratio of 1:8 to 8:1, thereby obtaining an oxygen storage material including three pyrochlore-type oxides which are a ceria-zirconia composite oxide, a lanthana-zirconia composite oxide, and a ceria-zirconia-lanthana composite oxide, and which coexist together. 8. The method for producing an oxygen storage material according to claim 7 , wherein the lanthana-zirconia composite oxide in the raw material mixture has no pyrochlore structure. 9. The method for producing an oxygen storage material according to claim 7 , wherein in the raw material mixture, a content of cerium relative to a total amount of cerium and zirconium in the pyrochlore-type ceria-zirconia composite oxide is 0.40 to 0.90 in an atomic ratio [Ce/(Ce+Zr)]. 10. The method for producing an oxygen storage material according to claim 7 , wherein in the raw material mixture, a content of lanthanum relative to a total amount of lanthanum and zirconium in the lanthana-zirconia composite oxide is 0.40 to 0.60 in an atomic ratio [La/(La+Zr)].
Assignees
Inventors
Classifications
Constitutive chemical elements of heterogeneous catalysts · CPC title
O2-storage component incorporated in the catalyst · CPC title
Zirconium · CPC title
Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title
- B01J23/002Primary
Mixed oxides other than spinels, e.g. perovskite · CPC title
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- What does patent US10220368B2 cover?
- An oxygen storage material comprises three pyrochlore-type composite oxides which are a ceria-zirconia composite oxide, a lanthana-zirconia composite oxide, and a ceria-zirconia-lanthana composite oxide, and which coexist together, wherein the oxygen storage material contains: first secondary particles made of the pyrochlore-type ceria-zirconia composite oxide and the pyrochlore-type c…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B01J23/002. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 05 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).