Patent ID: 11904298
Assignee: NGK INSULATORS, LTD.
Field: Chemical engineering (Chemistry)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A composite oxide catalyst comprising:
cerium that is a first metal, lanthanum that is a second metal, and a third metal as contained metals,
wherein said third metal is a transition metal, or a rare-earth metal other than cerium and lanthanum,
a cerium content in said contained metals is higher than 10 mol % of said contained metals and lower than or equal to 95 mol % of said contained metals,
a lanthanum content in said contained metals is higher than or equal to 2 mol % of said contained metals and lower than or equal to 93 mol % of said contained metals,
a content of said third metal in said contained metals is higher than or equal to 2 mol % of said contained metals and lower than or equal to 93 mol % of said contained metals,
said composite oxide catalyst substantially does not contain the elements of the platinum group, and
said composite oxide catalyst comprises particles including cavities when viewed in an SEM image at 5000× magnification.