纳米稀土—锆固溶体的合成及高温稳定性研究

Synthesis and Thermal Stability of Nano Rare Earth-Zirconium Solid Solution

采用共沉淀法制备了RE0.75Zr0.25O2固溶体。通过BET、XRD、SEM/TEM、程序升温还原和氧脉冲吸附等方法对合成产品性能进行了表征。研究了H2O2加入量、水热处理和表面活性剂的浸渍对固溶体高温稳定性的影响,其中水热处理和表面活性剂的浸渍是影响固溶体最终催化性能的关键因素。掺杂镧钇的铈锆固溶体经900℃老化6h后,仍保持单一的立方相结构,比表面积大于60m2.g-1,储氧量达到9.57mL.g-1,显示了较高的比表面积和储氧能力的高温稳定性。

Rare earth - zirconium solid solution RE0.75Zr0.25O2 was prepared by co - precipitation method. The products synthesized were characterized by BET,XRD,SEM/TEM,TPR and oxygen impulse adsorption. We had investigated the effect of added quantity of H2O2,hydrothermal treatment and impregnation of surfactants on the thermal stability of solid solution. And the hydrothermal treatment and the impregnation of surfactants were the key factors which influenced the final catalytic performances of solid solution. After aging at 900℃ for 6h,doped with lanthanum and yttrium ceria-zirconia solid solution,which still kept single cubic structure, showed high thermal stability, specific surface area and oxygen storage capacity. Specific surface area was higher than 60m^2·g^-1 and oxygen storage capacity was 9.57mL·g^-1.