Patent ID: 8999252
Filing Date: 2015-04-07
Classification: B01D,B01J,F01N,Y02T,Y10S

Abstract:
1. An exhaust gas catalyst comprising at least a support and multiple layers formed on the support, wherein at least one of the multiple layers has voids therein formed via a forming agent; and the at least one of the multiple layers having voids therein comprises, as catalytic components, a noble metal, alumina, and one or more composite oxides comprising, as main components, ceria, zirconia and one or more rare earth elements except for ceria, wherein the average diameter of the voids ranges from not less than 0.2 μm to not more than 500 μm and the one or more composite oxides has a specific surface area, after a heat treatment at 1000° C. for 2 hours, of not less than 40 m