Patent ID: 7189375

Claim:
An exhaust treatment device comprising: a plurality of filter elements and plugs alternately arranged in a serpentine structure to form a plurality of inlet channels and outlet channels, wherein the plugs are disposed at alternating ends of the filter elements, and wherein fluid communication from the inlet channels to the outlet channels is through the filter elements; a NO x adsorber composition disposed on and/or impregnated in surfaces of the filter elements or filter elements and plugs that form the inlet channels or outlet channels or a combination of the inlet and outlet channels; and a soot oxidation catalyst composition formed from an inorganic precursor and a catalytic metal disposed on or impregnated in surfaces of the filter elements or filter elements and plugs that form the inlet channels wherein the catalyst composition comprises an alkali metal catalytic metal oxide substantially uniformly dispersed in an alkali metal aluminate; wherein the alkali metal aluminate is selected from the group consisting of lithium aluminate, potassium aluminate, cesium aluminate, and mixtures comprising one or more of the foregoing aluminates; and wherein the alkali metal catalytic metal oxide comprises platinum, palladium, rhodium, ruthenium, iridium, osmium, and alloys and mixtures comprising at least one of the foregoing.