Patent ID: 8722000

Claim:
A catalytic article to remove emissions from a gas stream containing soot, ammonia, an ammonia precursor NO x , CO and hydrocarbons, the article comprising: a wall-flow filter for trapping soot in the gas stream, the filter having an inlet end and an outlet end defining an overall length, gas permeable walls having a thickness formed into a plurality of axially extending inlet channels and outlet channels, each inlet channel having inlet walls, an open inlet end and a plugged outlet end, each outlet channel having outlet walls, a plugged inlet end and an open outlet end, with each inlet channel having adjacent outlet channels; an hydrolysis catalyst that promotes the hydrolysis of the ammonia precursor, the hydrolysis catalyst coated on a portion of the inlet walls of the inlet channels extending from the inlet end; a selective catalytic reduction catalyst permeating the gas permeable walls, the selective catalytic reduction catalyst promoting the conversion of NO x in the gas stream to N 2 in the presence of excess oxygen; an ammonia oxidation catalyst coating a length of the outlet walls of the outlet channels that promotes the selective oxidation of ammonia to N 2 in the gas stream; and an oxidation catalyst coated on a portion of the outlet walls of the outlet channels extending from the outlet end toward the inlet end that promotes the oxidation of CO and hydrocarbons to CO 2 .