Patent ID: 9744529
Date: 2017-08-29
CPC Classifications: B01D,B01J,F01N,Y02T

Claim:
1. A layered catalyst composite for an exhaust stream of an internal combustion engine, the layered catalyst composite comprising a catalytic material on a substrate, the catalytic material comprising at least two layers, wherein: the first layer comprises rare earth oxide-high surface area refractory metal oxide particles, an alkaline earth metal supported on the rare earth oxide-high surface area refractory metal oxide particles, and at least one first platinum group metal component supported on the rare earth oxide-high surface area refractory metal oxide particles, wherein the rare earth oxide-high surface area refractory metal oxide particles have a ceria phase present in a weight percent of the particles in the range of about 20% to about 80% on an oxide basis; and the second layer comprises a second platinum group metal component supported on a first oxygen storage component (OSC) and/or a first refractory metal oxide support and, optionally, a third platinum group metal supported on a second refractory metal oxide support or a second oxygen storage component.