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Catalytic washcoat and method of preparation of the same

  • US 4,900,712 A
  • Filed: 09/30/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 09/30/1988
  • Status: Expired due to Term
First Claim
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1. The method of preparing a washcoating composition for use as a component of a catalytic coating which comprises the steps of preparing an aqueous colloidal solution of particles of one or more catalytically active non-noble metal doping oxide(s), contacting said solution with particles of a preformed washcoat base comprising a high surface area crystalline alumina, thereby uniformly adsorbing said doping particles thereon, limiting the amount of said doping oxide particles to amounts less than about 20% by weight of said doped preformed particles, and drying and calcining said doped preformed particles.

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