monolithic catalytic wall flow filter, emission treatment system, and, methods for manufacturing a monolithic catalytic wall flow filter and for treating a stream of residual combustion exhaust gas.

摘要

a monolithic wall flow filter for use in an emission treatment system comprises a wall flow monolith comprising a porous substrate having channels-defining surfaces and having a first zone extending in the longitudinal direction of a first face of end towards a second end face for a distance less than the filter length and a second zone extending in the longitudinal direction of the second end face towards the first end face and extending in the longitudinal direction for a shorter distance that the filter length, in which a first scr catalyst is distributed throughout the first porous substrate zone, an ammonia oxidation catalyst is distributed throughout the second porous substrate zone and a second scr catalyst is positioned in a layer covering the surfaces in the second zone of the porous substrate.