COMPOSITIONS AND METHODS FOR HIGH TEMPERATURE STABLE CATALYSTS

摘要

Catalysts having good high temperature stability which are particularly useful for selected high temperature reactions are disclosed as are methods for their preparation and use. The catalytically-active materials include platinum group metal deposited on a catalytic slip or composite which contains a mixture of alumina, a rare earth metal oxide, and a mixture of metallic oxides of selected IIA and ??A metals and selected VIB metals. The slips or carrier compositions are calcined at a temperature of at least 500.degree.C. before deposition of platinum group metal and characterized by having a surface area of at least 20 m2/g after calcination at a temperature of 1200.degree.C. for two hours.