Composition based on ceric oxide, preparation and use

Details Composition based on ceric oxide, preparation and use Composition based on ceric oxide, preparation and use

1997-07-07

1999-07-27

Straub, Gary P.

Chemistry of inorganic compounds

Rare earth compound

423593, 423594, 423595, 423617, C01F 1700

Patent

active

059286199

ABSTRACT:
The invention relates to new compositions based on ceric oxide having an improved oxygen storage capacity, these compositions being characterized in that they contain, besides ceric oxide, at least one oxide of another metallic element M chosen from the group consisting of iron, bismuth, nickel, tin and chromium or one of their mixtures, this oxide preferably being in solid solution with the abovementioned cerium oxide. The process of synthesis of these compositions consists in first of all preparing an intimate mixture between (i) a ceric oxide or a ceric hydroxide and (ii) at least one additive consisting of a hydroxide or a salt, thermally decomposable to an oxide, of the metallic element M, and in then calcining this mixture so as to obtain the desired composition based on oxides. The compositions according to the invention are particularly useful in the manufacture of catalysts and/or catalyst supports, especially those intended for treating exhaust gases from internal combustion engines.

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