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Application of synergized-PGM with ultra-low PGM loadings as close-coupled three-way catalysts for internal combustion engines

  • US 10,533,472 B2
  • Filed: 05/04/2017
  • Issued: 01/14/2020
  • Est. Priority Date: 05/12/2016
  • Status: Active Grant
First Claim
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1. A catalytic system for treating an exhaust stream of a combustion engine, comprising:

  • a close-coupled catalytic converter configured to accept at least one exhaust gas stream from said combustion engine, the close-coupled catalytic converter comprising a synergized platinum group metal catalyst comprising a spinel catalytic composition, wherein the synergized platinum group metal catalyst has a platinum group metal concentration of 1 g/ft3 to 10 g/ft3;

    an underfloor catalytic converter downstream of, and, in fluid communication with said close-coupled catalytic converter, the underfloor catalytic converter comprising a platinum group metal catalyst; and

    wherein the spinel catalyst composition comprises a binary spinel having a general formula AxB3-xO4 wherein X is from 0.01 to 2.99, and A and B are selected from the group consisting of sodium, potassium, calcium, barium, zinc, cadmium, aluminum, magnesium, manganese, nickel, copper, cobalt, iron, chromium, titanium, cerium, strontium, lanthanum, praseodymium, neodymium, samarium, indium, and mixtures thereof.

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