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Catalyst design for heavy-duty diesel combustion engines

  • US 9,566,568 B2
  • Filed: 05/11/2016
  • Issued: 02/14/2017
  • Est. Priority Date: 10/22/2013
  • Status: Active Grant
First Claim
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1. A coated substrate comprising:

  • a) a substrate;

    b) a first washcoat layer on the substrate comprising zeolites;

    c) a second washcoat layer on the substrate comprising a first catalytically active material comprising platinum and palladium, wherein the first catalytically active material comprises first composite nanoparticles embedded within porous micron-sized carrier particles;

    wherein the first composite nanoparticles comprises a first support nanoparticle and a first catalytic nanoparticle, wherein the first catalytic nanoparticle comprises a platinum-palladium alloy; and

    d) a third washcoat layer on the substrate comprising a second catalytically active material comprising platinum and palladium;

    wherein the second catalytically active material comprises second composite nanoparticles embedded within porous micron-sized carrier particles;

    wherein the second composite nanoparticles comprises a second support nanoparticle and a second catalytic nanoparticle, wherein the second catalytic nanoparticle comprises a platinum-palladium alloy;

    wherein the second washcoat layer is deposited on the first washcoat layer, and the third washcoat layer is deposited on the second washcoat layer.

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