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Engine exhaust treatment apparatus and method of use

  • US 6,497,851 B1
  • Filed: 12/21/1995
  • Issued: 12/24/2002
  • Est. Priority Date: 12/06/1994
  • Status: Expired due to Term
First Claim
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1. An engine exhaust treatment apparatus for abating pollutants contained in the exhaust stream of the engine, the apparatus defining a flow path for the exhaust stream and comprising:

  • (a) an upstream catalyst member comprising an upstream catalytic material effective for catalyzing the oxidation of hydrocarbons and comprising a platinum group metal component dispersed on a refractory metal oxide first support, the upstream catalyst being substantially free of oxygen storage components; and

    (b) a downstream catalyst member comprising a downstream catalytic material effective at least for the oxidation of hydrocarbons and comprising one or more catalytic metal components dispersed on a refractory metal oxide support and further comprising an oxygen storage component.

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