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PROCESS FOR ELIMINATION OF HEXAVALENT CHROMIUM COMPOUNDS ON METALLIC SUBSTRATES WITHIN ZERO-PGM CATALYST SYSTEMS

  • US 20150017082A1
  • Filed: 07/12/2013
  • Published: 01/15/2015
  • Est. Priority Date: 07/12/2013
  • Status: Active Grant
First Claim
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1. A method for reducing corrosion of a catalytic system, comprising:

  • providing a catalyst system, comprising;

    a substrate;

    a washcoat suitable for deposition on the substrate, comprising at least one first oxide solid selected from the group consisting of a first carrier material oxide, at least one first catalyst, and a mixture thereof; and

    an overcoat suitable for deposition on the substrate, comprising at least one second oxide solid selected from the group consisting of a second carrier material oxide, at least one second catalyst, and a mixture thereof;

    wherein at least one of the washcoat and the overcoat is aged; and

    providing an exhaust stream at a temperature of greater than 400°

    C. having one selected from the group consisting of hydrogen, carbon monoxide, ammonia and combinations thereof;

    wherein at least one hexavalent chromium compound is reduced.

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