关键词: CeO₂-ZrO₂-Al₂O₃, Bi₂O₃, 储氧性能, 还原性能

Abstract: A series of CeO₂-ZrO₂-Al₂O₃ oxygen storage materials were prepared by co-precipitation method and characterized by means of X-ray diffraction (XRD), low temperature nitrogen adsorption-desorption, oxygen storage capacity (OSC) and H₂-temperature programmed reduction (H₂-TPR). The results of XRD show that the phase structure of CZA are not changed by the addition of Y³⁺ and Bi³⁺, and all samples remain the single cubic fluorite structure after calcination at 600℃ and 1000℃. According to the results of low temperature nitrogen adsorption, the textural properties and thermal stability of Ce_0.6Zr_0.3Y_0.1O_1.95-Al₂O₃（CZYA）make a great progress after the introduction of Y³⁺, and after calcination at 1000℃ for 5h, specific surface area and pore volume of CZYA achieve 80.75m²/g and 0.22mL/g, respectively. The results of OSC and H₂-TPR show that co-doping Y³⁺ and Bi³⁺ into CZA exhibit positive effect on OSC of the materials. The OSC of Ce_0.6Zr_0.2Y_0.1Bi_0.1O_1.9-Al₂O₃（CZYBA）calcinated at 600℃ and 1000℃ reach 461μmol/g and 242μmol/g, respectively. Meanwhile the redox property of CZYBA is enhanced, the reduction peak temperature can be reduced from 546℃ to 429℃ after calcination at 1000℃ for 5h.

Key words: CeO₂-ZrO₂-Al₂O₃, Bi₂O₃, oxygen storage capacity, redox property