Integrated SCR and AMOx catalyst systems

  • US 8,524,185 B2
  • Filed: 11/03/2008
  • Issued: 09/03/2013
  • Est. Priority Date: 11/03/2008
  • Status: Active Grant
First Claim
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1. A catalyst system for treating an exhaust gas stream containing NOx, the system comprising:

  • at least one monolithic catalyst substrate having an inlet end and an outlet end;

    an undercoat washcoat layer coated on one the outlet end of the monolithic substrate and which covers less than 100% of the total length of the monolithic substrate, and containing a material composition A effective for catalyzing NH3 oxidation;

    an overcoat washcoat layer coated over a total length of the monolithic substrate from the inlet end to the outlet end sufficient to overlay the undercoat washcoat layer, and containing a material composition B effective to catalyze selective catalytic reduction (SCR) of NOx; and

    wherein material composition A and material composition B are maintained as physically separate catalytic compositions.

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