CERIA ZIRCONIA ALUMINA COMPOSITION WITH ENHANCED THERMAL STABILITY Russian patent published in 2017 - IPC B01J21/04 B01J21/06 B01J23/10 B01J37/02 B01J37/03 B01J37/04 

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