Patent Number: 6,255,242

Title: Zirconium- and cerium-based mixed oxide and method of production thereof

Abstract: A zirconium- and cerium-based mixed oxide having good thermal stability and oxidation-reduction performance, in particular, is provided. The mixed oxide which comprises zirconium and cerium is characterized in (1) that cubic phase purity of a zirconia- and ceria-based solid solution is not less than 95% by volume of the crystal phase thereof and (2) that the cubic phase purity is not less than 75% by volume even after two repetitions of the step of subjecting the mixed oxide to heat treatment at 1, C. and then cooling the same to room temperature. A method of producing the mixed oxide is also provided which comprises admixing basic zirconium sulfate with a cerium ion-containing solution and then adding a base to the resulting mixed solution to thereby causing formation of a precipitate.

Inventors: Umemoto; Yoshichika (Osaka, JP), Nakatani; Toshio (Osaka, JP), Ouchi; Kimio (Osaka, JP)

Assignee: Daiichi Kigenso Kagaku Kogyo Co., Ltd.

International Classification: B01J 35/00 (20060101); B01D 53/94 (20060101); C04B 035/48 (); C04B 035/488 (); C04B 035/50 ()

Expiration Date: 07/03/2018