Title:
COMPLEX OXIDE, METHOD FOR PRODUCING SAME AND EXHAUST GAS PURIFYING CATALYST
Document Type and Number:
WIPO Patent Application WO/2011/065416
Kind Code:
A1
Abstract:
Disclosed are: a silicon-containing cerium complex oxide which has excellent heat resistance and excellent reduction rate, and is capable of maintaining high specific surface area even in cases where the silicon-containing cerium complex oxide is used in a high-temperature environment; a method for producing the silicon-containing cerium complex oxide; and an exhaust gas purifying catalyst which utilizes the silicon-containing cerium complex oxide. Specifically disclosed is a complex oxide which contains 2-20% by mass of silicon in terms of SiO2 and has a specific surface area of not less than 40 m2/g as determined by a BET method after being fired at 1000°C for 5 hours. The complex oxide has a reduction rate of not less than 30% as calculated from the results of a temperature-programmed reduction measurement from 50°C to 900°C after being fired at 1000°C for 5 hours, and is particularly suitable as a promoter for an exhaust gas purifying catalyst that is used for automobiles and the like.
Inventors:
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
YOKOTA KAZUHIKO (CN)
Application Number:
PCT/JP2010/071005
Publication Date:
June 03, 2011
Filing Date:
November 25, 2010
Export Citation:
Assignee:
ANAN KASEI CO LTD (JP)
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
OHTAKE NAOTAKA (JP)
YOKOTA KAZUHIKO (CN)
International Classes:
B01J23/10; B01J33/00; F01N3/10
Domestic Patent References:
| WO2008025753A2 | 2008-03-06 |
Foreign References:
| JP2009530091A | 2009-08-27 | |||
| JPH11216676A | 1999-08-10 | |||
| JP2007520364A | 2007-07-26 | |||
| JPH10230162A | 1998-09-02 | |||
| JPS6256322A | 1987-03-12 | |||
| JPH05270824A | 1993-10-19 |
Other References:
ELIANA ROCCHINI ET AL.: "Relationships between Structural/Morphological Modifications and Oxygen Storage-Redox Behavior of Silica-Doped Ceria", JOURNAL OF CATALYSIS, vol. 194, 2000, pages 461 - 478, XP027233372
JOURNAL OF CATALYSIS, vol. 194, 2000, pages 461 - 478
See also references of EP 2505262A4
JOURNAL OF CATALYSIS, vol. 194, 2000, pages 461 - 478
See also references of EP 2505262A4
Attorney, Agent or Firm:
SAKAI Hajime et al. (JP)
Sakai 1 (JP)
Sakai 1 (JP)
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