Patent ID: 7138353

Claim:
A particulate matter combustion catalyst comprising an NO oxidation catalyst and an NO 2 decomposition catalyst, wherein the NO oxidation catalyst comprises a catalyst component selected from the group consisting of platinum, gold, and mixtures thereof, carried on an acidic first carrier selected from the group consisting of silica, silica alumina, zeolite with an SiO 2 /Al 2 O 3 ratio of 40 or greater, tungstic acid/zirconia, antimonic acid/alumina, and mixtures thereof, and the NO 2 decomposition catalyst comprises a catalyst component selected from the group consisting of the transition metals selected from the group consisting of iron, manganese, cobalt, copper, nickel, vanadium, yttrium, zinc, niobium and molybdenum, carried on a second carrier selected from the group consisting of titania, zirconia, titania-zirconia, alumina, and mixtures thereof, and wherein the NO oxidation catalyst and the NO 2 decomposition catalyst are separate powders present in a randomly mixed state in the particulate matter combustion catalyst.