Titania-doped zirconia as platinum group metal support in catalysts for treatment of combustion engine exhausts streams

A method of making a composite of mixed metal oxides comprising:

• obtaining or forming a first aqueous solution of a salt of zirconium, a salt of a metal promoter, and, optionally, a salt of a stabilizer;
• obtaining or forming a second aqueous solution of a salt of titanium;
• mixing the first and second aqueous solutions;
• and
• co-precipitating the zirconium, the optional metal of the promoter or stabilizer, and the titanium under basic conditions;
• thereby forming a co-precipitated mixed metal oxide composite.

A method of making a composite of mixed metal oxides comprising:

• obtaining a co-precipitated zirconia and metal promoter and optional stabilizer;
• obtaining an aqueous solution of a precursor of titanium;
• impregnating the co-precipitated zirconia and metal promoter with the precursor of titanium;
• thereby forming a mixed metal oxide composite.