PT-PD Diesel Oxidation Catalyst With CO/HC Light-Off And HC Storage Function

摘要

A diesel oxidation catalyst for the treatment of exhaust gas emissions, such as the oxidation of unburned hydrocarbons (HC), and carbon monoxide (CO) and the reduction of nitrogen oxides (NOx) is described. More particularly, the present invention is directed to a washcoat composition comprising high silica to alumina zeolite and platinum and palladium such that the zeolite minimizes negative interactions of these platinum group metals with the zeolite.

主权项

1. A catalytic article for treating exhaust gas emissions from a diesel engine containing hydrocarbons, carbon monoxide, and particulate matter comprising a diesel oxidation catalyst and a substrate:
the diesel oxidation catalyst comprising a first washcoat layer coated on said substrate comprising a high-surface area refractory metal oxide support, a platinum group metal component comprising platinum (Pt) and palladium (Pd) supported on the high surface area refractory metal oxide support, and a first zeolite component having a silica to alumina ratio that is greater than 1000.