| abstract |
A filter for removing particulate matter (PM) from exhaust gas from a forced ignition engine, the filter comprising a porous substrate having an input surface and an output surface, wherein the input surface and the output surface are comprised of a plurality of A porous structure of pores of a first average pore size is separated, wherein the porous substrate is coated with a washcoat layer comprising a plurality of solid particles, wherein the porous structure of the washcoat layer coated porous substrate comprises a plurality of washcoat layers having a first average pore size. Two average pore size pores, and the second average pore size is smaller than the first average pore size. |