Patent ID: 6589496
Filing Date: 2003-07-08
Classification: A61K,A61Q,B82Y,C01F,C01P,C08K,C09C,Y10T

Abstract:
A method for producing a metal oxide doped cerium oxide consisting essentially of the steps of:reacting, at a temperature lower than 60Â° C., and at a pH higher than 5, (a) aqueous solution comprising cerium salt, (b) aqueous solution of metal ion having (i) a larger ion radius than that of tetravalent cerium ion, or (ii) lower valence than that of tetravalent cerium ion, or (iii) both larger ion radius and lower valence than that of tetravalent cerium ion, and (c) alkali, and adding (d) an oxidizing agent to said reaction mixture at a temperature below 60Â° C., wherein said cerium oxide is doped with a metal having at least one of lower valence or larger ion radius, than tetravalent cerium ion.