Catalyzed SCR filter and emission treatment system

摘要

Provided is a catalyst article for simultaneously remediating the nitrogen oxides (NOx), particulate matter, and gaseous hydrocarbons present in diesel engine exhaust streams. The catalyst article has a soot filter coated with a material effective in the Selective Catalytic Reduction (SCR) of NOx by a reductant, e.g., ammonia.

主权项

1. A catalyst article consisting essentially of a wall flow monolith and a catalytic material,
wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, wherein the passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end, the wall flow monolith has a porosity of from 50% to 60% and an average pore size of from 10 to 25 microns, and the wall flow monolith contains the catalytic material; wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from one or more of a copper and iron component, the washcoat permeating the walls at a loading up to 2.4 g/in3, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.