Catalyst and method for reducing exhaust gas emissions

摘要

An apparatus useful to treat exhaust gas stream, including diesel engine exhaust. The exhaust stream passes form and exhaust outlet to a catalyzed filter in communication with the exhaust outlet. The catalyzed filter comprises a first catalyst which comprises a first platinum group metal; a first cerium component; and preferably a zirconium component. There can be a second catalyst in communication with the first catalyst, the second catalyst comprises a second cerium component.