中文摘要：

以Ce（NO_3）_3·6H_2O和ZrO（NO_3）_2·2H_2O为原料采用改进溶胶-凝胶法合成了纳米级铈锆固溶体,考察了不同铈锆摩尔比和温度条件对制备固溶体的粒度、晶型和还原性能的影响,获得了优化工艺条件.采用XRD、比表面积测定（BET）、扫描电子显微镜（SEM）、程序升温还原（TPR）进行表征.结果表明：此方法制备的固溶体均为立方萤石结构的铈锆固溶体复合氧化物,其比表面积可达92m~2/g;450℃焙烧制备的样品具有良好的还原活性.在常压固定床流动体系中进行乙醇水蒸气重整反应结果表明：当n（Ce）：n（Zr）=3：1时,CeO_2-ZrO_2固溶体比CeO_2和其它比例的固溶体具有更高的催化活性和对氢气的选择性.ZrO_2的引入不但改进了CeO_2的热稳定性,而且提高了CeO_2的还原能力.

英文摘要：

The nanosized CeO_2-ZrO_2 solid solutions were prepared by modified Sol-Gel method with Ce（NO_2）_3-6H_2O and ZrO（NO_3）_2·2H_2O as starting materials.The effects of different Ce/Zr molar ratio and calcination temperature on the particle size,crystal type and reducibility were studied to obtain optimal preparation condition. CeO_2-ZrO_2 solid solution was characterized by XRD,SEM and TPR measurements.Results show that the highest specific surface area of CeO_2-ZrO_2 solid solution is 92m~2/g while Ce/Zr molar ratio is 3：1.CeO_2-ZrO_2 solid solution prepared by modified Sol-Gel method is fluorite structured.TPR results show that CeO_2-ZrO_2 solid solution calcined at 450℃has good catalytic reducibility.Catalytic properties are estimated through a fix-bed reactor under atmospheric pressure.CeO_2-ZrO_2 solid solution with Ce/Zr molar ratio of 3：1 show higher catalytic activity and selectivity to ethanol steam reforming reaction than those of CeO_2 and other molar ratio CeO_2-ZrO_2 solid solution. Both reducibility and heat stability of CeO_2 can be improved with the addition of ZrO_2.