Patent Number: 6,762,147

Title: Composite oxide powder, catalyst and process for producing the same

Abstract: Composite oxide powder has a large specific surface area and a large pore volume even after a high-temperature durability test, without losing oxygen storage ability of a single metal oxide. In this composite oxide powder, a first metal oxide having oxygen storage ability is held as ultrafine particles in the form of islands by a second metal oxide which is different from the first metal oxide, pore volume is not less than 2 cc/g and the first metal oxide particles have a diameter of not more than 30 nm even after subjected to high temperature of 900.degree. C. or more. Since the first metal oxide particles are held in the form of islands by the second metal oxide particles, separated from each other and suppressed from contacting each other, the first metal oxide particles hardly grow granularly.

Inventors: Morikawa; Akira (Aichi-gun, JP), Tani; Takao (Aichi-gun, JP), Hatanaka; Miho (Aichi-gun, JP), Suda; Akihiko (Aichi-gun, JP)

Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho

International Classification: B01J 23/10 (20060101); B01D 53/94 (20060101); B01J 35/00 (20060101); B01J 37/00 (20060101); B01J 35/02 (20060101); C01B 13/02 (20060101); F01N 3/28 (20060101); B01J 021/08 ()

Expiration Date: 07/12012