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Gasoline engine emissions treatment systems having particulate filters

  • US 8,815,189 B2
  • Filed: 04/15/2011
  • Issued: 08/26/2014
  • Est. Priority Date: 04/19/2010
  • Status: Active Grant
First Claim
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1. An emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust stream comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates, the emission treatment system comprising a catalyzed particulate filter comprising:

  • a three-way conversion (TWC) catalytic material that is coated onto or within a particulate filter having an uncoated porosity;

    wherein the catalyzed particulate filter has a coated porosity that is substantially the same as the uncoated porosity of the particulate filter.

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