Catalytic compositions comprising the oxides of zirconium,...

Details Catalytic compositions comprising the oxides of zirconium,... Catalytic compositions comprising the oxides of zirconium,...

2011-06-21

2011-06-21

Hendrickson, Stuart (Department: 1736)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Metal, metal oxide or metal hydroxide

C423S213200, C423S594120, C502S303000, C502S304000, C502S349000

Reexamination Certificate

active

07964527

ABSTRACT:
Catalytic compositions useful, e.g., for the treatment of internal combustion engine exhaust gases, are based on zirconium oxide in a weight proportion of at least 25%, from 15% to 60% of cerium oxide, from 10% to 25% of yttrium oxide, from 2% to 10% of lanthanum oxide and from 2% to 15% of another rare earth oxide, have a specific surface of at least 15 m2/g and a cubic phase, and are prepared from a mixture of zirconium, cerium, yttrium, lanthanum and the additional rare earth, by precipitating such mixture with a base, heating the precipitate in an aqueous medium, adding thereto a surfactant and calcining the precipitate.

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