Patent ID: 9486793
Filing Date: 2016-11-08
CPC Classification: B01D,B01J,Y02A,Y02T

Claim Text:
1. A double-layer three-way catalyst on an inert catalyst support, comprising: a first layer on the inert catalyst support, comprising active alumina, a cerium/zirconium mixed oxide and palladium as a catalytically active noble metal; and a second layer applied to the first layer and in direct contact with the exhaust gas to be purified, comprising active alumina and rhodium as a catalytically active noble metal, wherein the second layer is free of cerium and cerium containing materials and does not contain any catalytically active noble metal besides rhodium, and the weight ratio of cerium oxide to zirconium oxide in the cerium/zirconium mixed oxide of the first layer is from 0.1 to 1.2.