Patent ID: 6605565
Filing Date: 2003-08-12
Classification: B01D,B01J,B82Y,C01G,C01P,C04B,Y02T

Abstract:
A nanocrystal cerium zirconium composite oxide, wherein said composite oxide comprises 4-98% by weight of CeO2 and 1-95% by weight of ZrO2, wherein the crystalline particle size of said composite oxide is 100 nm or less, wherein the ignition loss of said composite oxide after igniting at 900Â° C. for one hour is smaller than 5%, and wherein said composite oxide is a thermal decomposition product of a cerium zirconium precursor compound, wherein said thermal decomposition takes place at a temperature of from about 200Â° C. to about 1000Â° C., wherein said precursor compound comprises hydrazine or hydrazine salt, a cerium compound, and a zirconium compound, and wherein said cerium compound and said zirconium compound are each selected from the group consisting of nitrate, chloride, oxalate, carbonate, hydroxide, and mixtures thereof.