CERIA ZIRCONIA ALUMINA COMPOSITION WITH ENHANCED THERMAL STABILITY

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FIELD : technological processes. SUBSTANCE : invention relates to a method of producing calcined mixed oxide containing oxides of Al, Ce and Zr. Method includes following stages : (a) providing an aqueous slurry comprising hydroxides of cerium and zirconium and additionally containing one or more rare-earth metal hydroxides, other than cerium, (b) contacting cerium and zirconium hydroxides with boehmite of formula (AlO(OH)×H2O), to obtain an aqueous suspension of solid particles, (c) separating solid particles from aqueous suspension and drying to obtain a solid composition, and (d) calcining solid composition from step (c) at temperature from 450 to 1, 200 °C for at least one hour, to obtain a calcined mixed oxide. Also disclosed is a calcined mixed oxide. EFFECT : invention enables to obtain a calcined mixed oxide with improved thermal stability. 11 cl, 32 ex