Process for preparing zirconium-cerium-based mixed oxides

Details Process for preparing zirconium-cerium-based mixed oxides Process for preparing zirconium-cerium-based mixed oxides

2002-10-30

2008-10-07

Nguyen, Ngoc-Yen M. (Department: 1793)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C423S263000, C423S593100, C423S608000, C501S103000, C501S126000, C502S217000, C502S304000, C502S349000, C502S439000

Reexamination Certificate

active

07431910

ABSTRACT:
A process for preparing zirconium-cerium-based mixed oxides which comprises reacting an alkali with an aqueous solution of a zirconium salt containing 0.42-0.7 mole of sulphate anion (SO42−) per mole of zirconium cation at a temperature of not greater than 50° C., in the presence of a cerium salt to form a cerium-zirconium mixed hydroxide, and then calcining the cerium—zirconium mixed hydroxide to form a mixed oxide. The mixed oxides possess good thermal stability and are essentially single phase and are suitable as promoters and catalyst supports in, particularly, automobile exhaust systems.

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