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Composition based on cerium and zirconium oxides having a specific surface which is stable between 900°c and 1000ºc method for the production and use thereof as a catalyst
Composition based on cerium and zirconium oxides having a specific surface which is stable between 900°c and 1000ºc method for the production and use thereof as a catalyst
The inventive composition, according to a first embodiment, consists essentially of a cerium oxide and a zirconium oxide. According to a second embodiment, said composition is based on cerium oxide, zirconium oxide and at least one rare earth oxide other than cerium. After a first 4-hour period of calcination at 900 .C followed by a second 10-hour period of at 1000 .C, the specific surface variation thereof is 20% maximum in the first embodiment and 15% maximum in the second embodiment. The inventive composition can be used as a catalyst, i.e. in the treatment of waste gases from internal combustion engines.
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