Patent ID: 8512657

Claim:
A system for filtering particulate matter from exhaust gas, said system comprising: a filter having inlet surfaces, outlet surfaces, and a porous structure between the inlet surfaces and the outlet surfaces; a selective catalytic reduction (SCR) washcoat comprising a small pore zeolite promoted with at least one metal selected from the group consisting of Cr, Co, Cu, Fe, Hf, La, Ce, In, V, Mn, Ni, Zn, Ga, Ag, Au, Pt, Pd, and Rh, wherein the washcoat is disposed: on the inlet surfaces, on the outlet surfaces, or within the porous structure and provides a washcoated filter for filtering the particulate matter; and wherein the porous structure has substrate pores of a first mean pore size; the washcoat defines pores of a second mean pore size; and the second mean pore size is less than the first mean pore size, and; a NO x absorber catalyst disposed upstream of the washcoat.