| abstract |
The present invention comprises a porous substrate having an inlet surface and an outlet surface wherein the inlet surface is separated from the outlet surface by a porous structure having pores of a first average pore size and the porous substrate comprises a plurality of solid particles Wherein the porous structure of the washcoated porous substrate has pores of a second average pore size and the second average pore size is less than a first average pore size, To a filter for filtering particulate matter (PM) from a gas. |