Catalyzed SCR filter and emission treatment system

An emission treatment system for treatment of an exhaust stream comprising NOx and particulate matter, the emission treatment system comprising:

• (a) an oxidation catalyst disposed on a flow-through monolith positioned downstream from an engine, wherein the oxidation catalyst comprises one or more of a platinum group metal, a base metal, a zeolite, and an alkaline earth metal oxide, wherein the oxidation catalyst is effective to convert at least a portion of NO to NO2;
• (b) an injector in fluid communication with and downstream of the oxidation catalyst, wherein the injector periodically meters ammonia or an ammonia precursor into the exhaust stream;
• and
• (c) a catalyst article in fluid communication with and downstream of the injector, the catalyst article comprising a wall flow monolith and an SCR catalytic material contained within the wall flow monolith, wherein the wall flow monolith has a wall porosity of from 55% to 75% and an average pore size of from 10 to 30 microns, and comprises a plurality of longitudinally extending passages formed by longitudinally extending porous 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, and wherein the SCR catalytic material comprises a zeolite and a base metal selected from copper and iron, the wall flow monolith having integrated NOx and particulate removal efficiency when exposed to the exhaust stream and ammonia.