Patent ID: 9446395
Filing Date: 2016-09-20
CPC Classification: B01D,B01J,Y02A,Y02T

Claim Text:
1. An exhaust treatment system comprising: a close-coupled catalyst comprising a three-way catalyst; a low temperature catalyst positioned in an underbody of a vehicle and downstream from said close-coupled catalyst, said low temperature catalyst comprising a platinum group metal impregnated onto an oxygen storage material, the oxygen storage material comprising cerium and zirconium oxides with at least 50% cerium oxide by weight, and the oxygen storage material calcined to bond to said platinum group metal, said low temperature catalyst forming a washcoat on a support structure comprising cordierite; and wherein the underbody position of said low temperature catalyst is such that an exhaust gas temperature from a vehicle engine does not exceed 850° C. during normal vehicle operation at the underbody position.