Patent ID: 6150288
Filing Date: 2000-11-21
Classification: B01D,B01J,Y02T

Abstract:
A composite oxide carrier manufactured by the method comprising the steps of:forming a precursor of oxides of elements of aluminum and at least one of cerium and zirconium, by mixing a solution of salts of said elements with an alkaline solution; and thenfiring said precursor to form a composite oxide carrier of alumina and at least one of ceria, zirconia and ceria-zirconia composite oxide,wherein said mixing is carried out over a period of time such that the composite oxide carrier has the following property;after subjecting the composite oxide carrier to heating in air at 1000.degree. C. for 5 hours, x-ray diffraction analysis reveals that the at least one of ceria, zirconia, and ceria-zirconia composite oxide has a crystallite diameter of 10 nm or less and part of the at least one of ceria, zirconia, and ceria-zirconia composite oxide is present as a secondary particle dispersed in the alumina.