COMPOSITION BASED ON ZIRCONIUM OXIDES, CERIUM AND ANOTHER RARE EARTH AT MAXIMUM TEMPERATURE OF REDUCED REDUCIBILITY, PROCESS FOR PREPARATION AND USE IN THE CATALYSIS FIELD.

摘要

The composition of the invention is based on oxides of zirconium, cerium and at least one rare earth other than cerium, with a cerium oxide content of at most 50% by weight and it has after calcination at 1000 ° C, 6 hours, a maximum reducibility temperature of at most 500 ° C and a specific surface area of at least 45 m2 / g. It is prepared by a process in which a mixture of zirconium, cerium and other rare earth compounds is continuously reacted with a basic compound with a residence time of not more than 100 milliseconds; the precipitate is heated and then brought into contact with a surfactant before being calcined.