Oxidation catalyst and method for producing the oxidation catalyst

摘要

An oxidation catalyst is disclosed, which contains Ce and Ga, and a Ce—Ga composite oxide containing a solid solution in which a part of Ce is substituted with Ga. This oxidation catalyst is obtained in such a manner that pH of a mixed solution obtained by mixing a Ce-containing solution and a Ga-containing solution together is adjusted, and a precipitate obtained by coprecipitating Ce and Ga is dried and baked.

主权项

1. An oxidation catalyst that decreases a PM oxidation or combustion temperature, consisting of: a Ce—Ga composite oxide consisting of Ce, Ga and oxygen, and an alkali metal, wherein
the Ce—Ga composite oxide has a crystal structure and contains a solid solution in which Ga exists at a portion of Ce sites of the crystal structure, the alkali metal exists on a surface of the Ce—Ga composite oxide and is capable of promoting oxidation of the PM, wherein the oxidation catalyst is capable of decreasing a PM oxidation temperature or combustion temperature, wherein a molar ratio of Ce/Ga in the solid solution of the Ce—Ga composite oxide is 97/3 to 85/15.