Catalytic reduction of NOx

CAFC
  • US 7,498,010 B2
  • Filed: 07/08/2004
  • Issued: 03/03/2009
  • Est. Priority Date: 02/06/1998
  • Status: Expired due to Fees
First Claim
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1. A method of reducing pollutants, including particulates and NOx, in a gas stream, comprising passing said gas stream over an oxidation catalyst under conditions effective to convert a portion of NO in the gas stream to NO2 to produce a gas mixture comprising a mixture of NO and NO2, wherein the gas mixture has an enhanced NO2 content relative to the gas stream entering the oxidation catalyst, removing at least a portion of said particulates in a particulate trap located downstream of the oxidation catalyst, reacting trapped particulate with NO2, adding reductant fluid to the gas stream to form a gas mixture downstream of said trap, and passing the gas mixture over an SCR catalyst under NOx reduction conditions.

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