Abstract:

Low cerium content Ce-Zr-Y tenary compound was prepared with ammonia aqueous solutioncarbonate ammonia mixed solution as the precipitator. Its crystal structure, specific surface area, pore size distribution, oxygen storage capacity(OSC) and redox behavior were investigated by X-ray diffraction, BET, oxygen pulse adsorption and H₂temperature programmed reduction(H₂-TPR). The results show a high specific surface area of 116.8 m²/g and total pore volume of 0.30 cm³/g after calcining at 873 K for 4 h, and after aging at 1 273 K for 10 h, the specific surface area and total pore volume of 68.1 m²/g and 0.22 cm³/g were maintained. According to the results of XRD, there was only one tetragonal Zr _0.84 Ce _0.16 O₂ in the mixed oxide, and its crystal structure was stable in the process of thermal treatment. The results of OSC and H₂-TPR show that the oxygen storage capacities were maintained even after being treated at 1 073 K and 1 273 K indicating the durability of the materials.

Key words: Oxygen storage material; Textural property; High specific surface area; High thermal stability; Oxygen storage capacity