COMPOSITION CONSISTANT EN UN OXYDE MIXTE DE ZIRCONIUM ET DE CERIUM A REDUCTIBILITE ELEVEE, PROCEDE DE PREPARATION ET UTILISATION DANS LE DOMAINE DE LA CATALYSE

摘要

The invention relates to a composition essentially consisting of a zirconia-ceria mixed oxide, with a zirconia content of at least 40 wt. % and, after 4 hours of calcination at 1000° C., a specific surface area of at least 25 m2/g and a quantity of mobile oxygen between 200° C. and 400° C. of at least 0.5 ml O2/g. Said composition is produced using a method wherein a mixture of cerium and zirconium compounds is continuously reacted with a basic compound in a reactor, with a maximum residence time of the reactive medium in the mixture zone of the reactor of 100 milliseconds; and the precipitate is heated then brought into contact with a surfactant before being calcinated.