oxidation catalyst composite, method for treating a diesel engine exhaust gas stream, and system for treating a poor burning engine exhaust gas stream.

摘要

A composite of oxidation catalyst, methods and systems for treating exhaust gas emissions from a diesel engine are described. more particularly, an oxidation catalyst composite comprising a first oxidation material comprising a first refractory metal oxide support, a rare earth oxide and palladium (pd); a second oxidizing material comprising a second refractory metal oxide and platinum (pt) and palladium (pd); and a protective overlay comprising a third refractory metal oxide, platinum (pt) and optionally palladium (pd), and a molecular sieve promoted with a metal selected from one or more cu, fe, co, ni, mn, v, and ag. The oxidation catalyst composite is sulfur tolerant.