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

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 and a second washcoat layer coated on the first washcoat layer, wherein one of the first and second washcoat layers comprises a high surface area refractory metal oxide support and the other of the first and second washcoat layers comprises 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 greater than 1000.