Catalyzed SCR filter and emission treatment system

  • US 7,229,597 B2
  • Filed: 08/05/2003
  • Issued: 06/12/2007
  • Est. Priority Date: 08/05/2003
  • Status: Active Grant
First Claim
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1. An emission treatment system for treatment of an exhaust stream comprising NOx and particulate matter, the emission treatment system comprising:

  • a) an oxidation catalyst;

    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 wall flow monolith in fluid communication with and downstream of the injector, 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,wherein the wall flow monolith comprises an SCR catalyst composition that permeates the walls at a concentration of at least 1.3 g/in3;

    wherein the wall flowmonolith has a wall porosity of at least 50% with an average pore size of at least 5 microns.

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