Cerium/zirconium-base composite oxide, method for producing the same, oxygen storage/release component using said cerium-zirconium-base composite oxide, exhaust gas purification catalyst, and exhaust gas purification method using the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01J-021/06
B01J-023/10
C01G-025/02
C01B-013/14
C01F-017/00
F01N-003/10
출원번호
US-0926786
(2010-12-09)
등록번호
US-8187995
(2012-05-29)
우선권정보
JP-2004-303557 (2004-09-16)
발명자
/ 주소
Wakita, Takahiro
Kohara, Akira
Kanno, Yasuharu
Omoto, Hiroaki
출원인 / 주소
Daiichi Kigenso Kagaku Kogyo Co., Ltd.
대리인 / 주소
Edwards Wildman Palmer LLP
인용정보
피인용 횟수 :
6인용 특허 :
4
초록▼
This invention relates to a cerium-zirconium-base composite oxide, which is useful, e.g., for the purification of exhaust gas discharged from combustion engines such as internal combustion engines and boilers and can release a high level of oxygen in a low temperature region, a method for producing
This invention relates to a cerium-zirconium-base composite oxide, which is useful, e.g., for the purification of exhaust gas discharged from combustion engines such as internal combustion engines and boilers and can release a high level of oxygen in a low temperature region, a method for producing the same, an oxygen storage/release component using the same, an exhaust gas purification catalyst, and an exhaust gas purification method. The cerium-zirconium-base composite oxide satisfies requirements (1) that the oxygen release initiation temperature is 380° C. or below, (2) that the oxygen release amount is not less than 485 μmol/g, and further (3) that the oxygen release amount at 400° C. is not less than 15 μmol/g. The cerium-zirconium-base composite oxide can be produced, for example, by mixing a starting material for cerium and a starting material for zirconium at a predetermined mixing ratio together, melting the starting material mixture at a temperature at or above the melting point, then cooling the melt to form an ingot, then optionally grinding the ingot to prepare powder, subsequently removing strain within powder crystal grains under heating, and then grinding to a further fine state.
대표청구항▼
1. An oxygen storage/release component containing a cerium/zirconium-base composite oxide comprising: cerium and zirconium,the cerium/zirconium-base composite oxide being made by a step for melting the starting material mixture at a temperature of 2000° C. or greater to be molten and satisfying requ
1. An oxygen storage/release component containing a cerium/zirconium-base composite oxide comprising: cerium and zirconium,the cerium/zirconium-base composite oxide being made by a step for melting the starting material mixture at a temperature of 2000° C. or greater to be molten and satisfying requirements (1) an oxygen release initiation temperature is 380° C. or below, (2) an oxygen release amount is not less than 485 μmol/g, and further (3) an oxygen release amount at 400° C. is not less than 15 μmol/g, andthe cerium/zirconium-base composite oxide exhibits a large crystalline structure and when calcined at a high of 1050° C. and a high of 1150° C. in air, has a main peak at both temperatures, relevant to Zr0.5Ce0.5O2, essentially in overlap around scattering angle (2θ) 29 reaching a scattering intensity of around 100,000 for both temperatures. 2. An exhaust gas purification catalyst containing the oxygen storage/release component according to claim 1. 3. The exhaust gas purification catalyst according to claim 2, wherein the oxygen storage/release component has a particle diameter of 1 μm or less. 4. The exhaust gas purification catalyst according to claim 2, wherein the exhaust gas purification catalyst further contains at least one species of noble metal element selected from the group consisting of platinum, rhodium and palladium. 5. The exhaust gas purification catalyst according to claim 4, wherein the noble metal element is loaded on a porous inorganic oxide. 6. The exhaust gas purification catalyst according to claim 2, wherein the oxygen storage/release component is coated or is formed into a pellet, on a surface of internal structure type carrier. 7. An exhaust gas purification method, wherein the exhaust gas purification catalyst of claim 2 is positioned in an exhaust gas passage to allow the exhaust gases to pass over the catalyst to purify at least one species of hazardous substance of carbon monoxide, hydrocarbons or nitrogen oxides present in the exhaust gases. 8. The exhaust gas purification method according to claim 7, wherein the exhaust gas passage is for an internal combustion engine. 9. The exhaust gas purification method according to claim 8, wherein the internal combustion engine is operated under rich and lean conditions cyclically. 10. The oxygen storage/release component containing the cerium/zirconium-base composite oxide according to claim 1, wherein the CeO2/ZrO2 molar ratio is 1/9 to 9/1. 11. The oxygen storage/release component containing the cerium/zirconium-base composite oxide according to claim 1, wherein the CeO2/ZrO2 molar ratio is 2/3 to 3/2. 12. The oxygen storage/release component containing the cerium/zirconium-base composite oxide according to claim 1, wherein an average particle diameter is 0.3 to 2.0 μm. 13. An exhaust gas purification method, wherein the exhaust gas purification catalyst of claim 3 is positioned in an exhaust gas passage to allow the exhaust gases to pass over the catalyst to purify at least one species of hazardous substance of carbon monoxide, hydrocarbons or nitrogen oxides present in the exhaust gases. 14. An exhaust gas purification method, wherein the exhaust gas purification catalyst of claim 4 is positioned in an exhaust gas passage to allow the exhaust gases to pass over the catalyst to purify at least one species of hazardous substance of carbon monoxide, hydrocarbons or nitrogen oxides present in the exhaust gases. 15. An exhaust gas purification method, wherein the exhaust gas purification catalyst of claim 5 is positioned in an exhaust gas passage to allow the exhaust gases to pass over the catalyst to purify at least one species of hazardous substance of carbon monoxide, hydrocarbons or nitrogen oxides present in the exhaust gases. 16. An exhaust gas purification method, wherein the exhaust gas purification catalyst of claim 6 is positioned in an exhaust gas passage to allow the exhaust gases to pass over the catalyst to purify at least one species of hazardous substance of carbon monoxide, hydrocarbons or nitrogen oxides present in the exhaust gases. 17. The exhaust gas purification method according to claim 13, wherein the exhaust gas passage is for an internal combustion engine. 18. The exhaust gas purification method according to claim 17, wherein the internal combustion engine is operated under rich and lean conditions cyclically. 19. The exhaust gas purification method according to claim 14, wherein the exhaust gas passage is for an internal combustion engine. 20. The exhaust gas purification method according to claim 19, wherein the internal combustion engine is operated under rich and lean conditions cyclically.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (4)
Okamoto, Kenji; Takami, Akihide; Yamada, Hiroshi; Miyoshi, Seiji, Catalyst for purifying exhaust gas and method for purifying exhaust gas with the catalyst.
Kumatani, Naoki; Tanabe, Toshitaka; Morikawa, Akira; Miura, Masahide; Suzuki, Hiromasa, Core-shell oxide material, method for producing the same, and catalyst and method for purification of exhaust gas using the core-shell oxide material.
Adelmann, Katja; Jeske, Gerald; Domesle, Rainer; Soeger, Nicola; Seyler, Michael; Schuler, Anke; Pauly, Thomas R.; Southward, Barry W. L., Mixed oxide materials for the selective catalytic reduction of nitrogen oxides in exhaust gases.
Heo, Il Jeong; You, Young Woo; Park, Ji Hoon; Park, Jung Hyun; Chang, Tae Sun; Kim, Beom Sik; Suh, Jeong Kwon, Thermally stable monolith catalyst for reforming reaction.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.