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Methods to reduce alkali material migration from NOx adsorber washcoat to cordierite

  • US 20020082164A1
  • Filed: 01/11/2001
  • Published: 06/27/2002
  • Est. Priority Date: 01/14/2000
  • Status: Abandoned Application
First Claim
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1. An exhaust gas catalyst system, comprising:

  • a substrate; and

    a nitrogen oxide adsorber disposed on said substrate, the nitrogen oxides adsorber comprising;

    a porous support;

    at least one alkali metal barrier; and

    a material loaded on said porous support comprising;

    a NOx oxidation catalyst; and

    at least one alkali material.

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