Alumina modified cerium zirconium mixed oxides of high cerium content were prepared by a co-precipitation method and verified to possess high specific surface area and high pore volume. The effects of alumina modification and precursor moisture calcination on the structure and catalytic performance of cerium zirconium mixed oxides were studied. The results showed that alumina modification could significantly enhance the specific surface area, pore volume and high thermal stability of the cerium zirconium mixed oxides. The alumina modified sample demonstrated fresh specific surface area of 122.01 m2/g, pore volume of 0.475 0 mL/g and thermal aged （1 000 ℃, 4 h） specific surface area of 66.28 m2/g. The precursor moisture calcination could improve the oxygen storage capacity of alumina modified cerium zirconium mixed oxides, and enhance the high thermal stability of cerium zirconium mixed oxides. The thermal aged (1 000 ℃，4 h) specific surface area of samples by precursor moisture calcination increased 2.28 m2/g compared to the normal cerium zirconium mixed oxides, and increased 2.75 m2/g compared to the common alumina modified cerium zirconium mixed oxides. Moreover, alumina modification also increased the air/fuel ratio window of the fresh Pd supported catalyst, and elevated the catalytic conversions of C3H8 and NO.Whereas precursor moisture calcination promoted the catalytic conversions of CO, C3H8 and NO of the alumina modified Pd supported cerium zirconium catalyst.

alumina modification; high cerium content; cerium zirconium mixed oxides; preparation; catalytic performance