CERIUM OXIDE-ZIRCONIUM OXIDE BASED COMPOSITE RARE-EARTH OXIDE AND PREPARATION METHOD THEREOF

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Provided is a method for preparing a cerium oxide-zirconium oxide based composite rare-earth oxide, comprising : (1) heating a zirconium salt solution at room temperature, slowly adding sulphate ions, controlling the rate of the temperature increase, so that the temperature is increased to 90-95°C when the addition of sulphate ions is completed, and then maintaining the temperature for 20-100 minutes to form a zirconium basic sulphate composite salt precursor; (2) adding a cerium salt and a rare-earth metal salt to the precursor solution and stirring until uniform to obtain a slurry; (3) precipitating the slurry using a basic carbonate and/or a basic oxalate solution to obtain a precipitate; (4) filtering and washing the precipitate obtained in step (3), removing impurities, and calcining the washed precipitate. Also provided is a cerium oxide-zirconium oxide based composite rare-earth oxide prepared by the method.