Preparation and Property of Ce-Zr-Al Oxygen Storage Materials Modified by Y3+ and Bi3+ Addition

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 Ce0.6Zr0.3Y0.1O1.95-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 Ce0.6Zr0.2Y0.1Bi0.1O1.9-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.