Method of preparing a supported catalyst

Claim 1

A method of preparing a supported catalyst comprising the steps of: (i) providing an aqueous hydrolysis solution containing, as a first constituent, one or more compounds each being hydrolysable to a hydroxide convertible to a catalytically active component under the conditions of step (v) below, and containing, as a second constituent, one or more compounds each being hydrolysable to a hydroxide convertible to a ceramic oxide under the conditions of step (v) below; (ii) providing said aqueous hydrolysis solution in an aqueous hydrolysis agent solution comprising a co-hydrolysis agent to effect hydrolysis of said first and second hydrolysable constituents under conditions such that an aqueous dispersion comprising an intimate mixture of said hydroxides is produced; (iii) converting the aqueous dispersion to a thixotropic dispersion by a process including aging the aqueous dispersion by subjecting it to a heat treatment to give a gel; (iv) contacting the thixotropic dispersion with a substrate to produce a coating thereon; and (v) firing to convert said hydroxides to said catalytically active component and to said ceramic oxide thereby to produce a catalytically active coating on the substrate.

Claim 2

A method of preparing a supported catalyst comprising the steps of: (i) providing an aqueous hydrolysis solution containing, as a first constituent, one or more compounds each being hydrolysable to a hydroxide convertible to a catalytically active component under the conditions of step (v) below, and containing, as a second constituent, one or more compounds each being hydrolysable to a hydroxide convertible to a ceramic oxide under the conditions of step (v) below; (ii) providing said aqueous hydrolysis solution in an aqueous hydrolysis agent solution comprising a co-hydrolysis agent to effect hydrolysis of said first and second hydrolysable constituents under conditions such that an aqueous dispersion comprising an intimate mixture of said hydroxides is produced; (iii) converting the aqueous dispersion to a thixotropic dispersion by a process including aging the aqueous dispersion by subjecting it to a heat treatment to give a gel; (iv) contacting the thixotropic dispersion with a substrate to produce a coating thereon; and (v) firing to convert said hydroxides to said catalytically active component and to said ceramic oxide thereby to produce a catalytically active coating on the substrate.