Catalyst For Gasoline Lean Burn Engines With Improved NO Oxidation Activity

  • US 20120055141A1
  • Filed: 09/02/2011
  • Published: 03/08/2012
  • Est. Priority Date: 09/02/2010
  • Status: Active Grant
First Claim
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1. A catalyst comprising a substrate and a catalyst coating, the catalyst coating comprising two or more layers, said layers comprising:

  • (a) a first layer provided on the substrate, said first layer comprising Pt and/or Pd; and

    (b) a second layer provided on the first layer, said second layer comprising Pt;

    the first and second layers each further comprising;

    one or more particulate support materials;

    one or more oxygen storage component (OSC) materials; and

    one or more nitrogen oxide storage materials comprising one or more elements selected from the group of alkali and/or alkaline earth metals,wherein the total amount of alkali and alkaline earth metals comprised in the one or more nitrogen oxide storage materials contained in the catalyst ranges from 0.18 to 2.5 g/in3 calculated as the respective alkali metal oxides M2O and alkaline earth metal oxides MO.

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