Anan Kasei Co., Ltd.

Shigeru Aozasa

Emmanuel Rohart

Bernard Pacaud

Lianxin Dai

The present invention relates to ceric oxide that has excellent heat resistance and oxygen absorbing and desorbing capability useful as a co-catalyst material suitable for a catalyst for purifying exhaust gas, that is capable of maintaining a large specific surface area even in use in a high temperature environment, and that is suitable for use in a high temperature environment, yet capable of exhibiting high oxygen absorbing and desorbing capability also in a lower temperature range, a method for preparing such ceric oxide, and a catalyst for purifying exhaust gas utilizing such ceric oxide. The ceric oxide is an oxide composed essentially of ceric oxide, and has a specific surface area of not smaller than 30.0 m/g after calcination at 900&#xb0; C. for 5 hours.

Ceric oxide and method for production thereof, and catalyst for exhaust gas clarification

A zirconium&mdash;cerium composite oxide having excellent heat resistance and being capable of maintaining its large specific surface area even when used under high-temperature conditions, which composite oxide contains zirconium and cerium at a weight ratio of 51 to 95:49 to 5 in terms of zircomium oxide and ceric oxide, the composite oxide having a specific surface area of not smaller than 50 m,/g, wherein said composite oxide is capable of maintaining a specific surface area of not smaller than 20 m,/g even after heating at 1100&deg; C. for 6 hours, a method for preparing the same, and a co-catalyst for purifying exhaust gas prepared with the composite oxide.

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Anan, Japan

Shigeru Aozasa