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Catalyst system for converting emissions of a lean-burn engine

  • US 5,788,936 A
  • Filed: 07/23/1992
  • Issued: 08/04/1998
  • Est. Priority Date: 10/07/1991
  • Status: Expired due to Fees
First Claim
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1. A method of treating the emission from a fossil-fueled engine, using lean-burn combustion, the emission having an oxygen content of 1.5-10% O2, the method comprising:

  • (a) injecting a hydrocarbon reductant selected from the group consisting of straight chain, branched chain, or aromatic hydrocarbons or oxygenated compounds, said hydrocarbon reductant being injected into the catalyst stream entering a first stage nitric oxide reduction catalyst comprised of highly acidic gamma alumina;

    (b) exposing the injected stream to the nitric oxide reduction catalyst; and

    (c) exposing the effluent from the reducing catalyst to an oxidation catalyst.

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