초록 ▼

The invention is concerned with a method of adsorbing uniformly onto preformed high surface area crystalline alumina one or more catalytically active non-noble (doping) oxide(s) and preferably alumina-stablilizing non-noble doping oxide(s), both from substantially neutral aqueous colloidal solutions

The invention is concerned with a method of adsorbing uniformly onto preformed high surface area crystalline alumina one or more catalytically active non-noble (doping) oxide(s) and preferably alumina-stablilizing non-noble doping oxide(s), both from substantially neutral aqueous colloidal solutions thereof, drying and calcining the doped alumina to form an improved washcoating composition for receiving additionally catalytic noble metal particles.

대표청구항 ▼

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 preforme

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.