Patent ID: 7449163
Filing Date: 2008-11-11
Classification: B82Y,C01G,C01P

Abstract:
1. A method for preparing nanoparticles comprising cerium oxide and zirconium, wherein the method comprises the steps of: (a) providing a first aqueous solution comprising zirconium oxychloride; (b) mixing the first aqueous solution with a second aqueous solution comprising a first component selected from the group consisting of cerium nitrate and hexamethylenetetramine to form a first mixture; (c) mixing the first mixture with a third aqueous solution comprising a second component selected from the group consisting of cerium nitrate and hexamethylenetetramine to form a second mixture, wherein the second component is different from the first component; (d) maintaining the second mixture at a temperature no higher than about 320° K to form nanoparticles therein; (e) separating the nanoparticles formed in step (d) from the second mixture; and (f) sintering the nanoparticles separated in step (e) in air at a temperature ranging between about 500° C. to about 1100° C.