采用反向微乳法制备了Co/Ce_xZr_1-xO_2-δ（x为0、0.1、0.2、0.3、0.4、0.5）催化剂，探究了构建的微乳液体系中不同Ce组分的质量分数对甲烷催化燃烧活性的影响。对系列催化剂进行了XRD、BET、H₂-TPR、SEM等分析手段的表征及催化剂的活性测试。结果表明，在催化剂Co/ZrO₂中掺杂适量的Ce增大了比表面积，促进了Co的高度分散，形成了均相的Ce-Zr-O固溶体，且Co的相关物种也进入固溶体内部，形成了Co-Ce-Zr-O三元混合固溶体。Ce的掺杂显著降低了Co/ZrO₂催化剂的起燃温度，且甲烷的转化率随Ce掺杂质量分数的增加呈现先升高后降低的趋势；存在最佳掺杂量（x=0.3），此时催化剂Co/Ce_0.3Zr_0.7O_2-δ具有最高的催化活性，起燃温度（T_10%）为340℃，完全转化温度（T_90%）为500℃。

A series of Co/Ce_xZr_1-xO_2-δ(x=0,0.1,0.2,0.3,0.4,0.5) catalysts are synthesized via reverse microemulsion method.The effect of different Ce contents in the microemulsion system on the performance of the prepared catalysts in catalyzing methane combustion is investigated.The catalysts are characterized by XRD,BET,H₂-TPR and SEM,and their catalytic activities are tested.Results demonstrate that appropriate amount of Ce additives in the catalysts increases the specific surface area of the catalysts and reduces the grain size,which is favorable to the formation of homogeneous Ce-Zr-O solid solution,and Co species also enter the solid solution to form Co-Ce-Zr-O ternary mixed solid solution.Therefore,Ce doping reduces significantly the ignition temperature of Co/ZrO₂ catalyst.As Ce content increases,the conversion of methane increases first and decreases then.So there exists an optimal doping content (x=0.3),at which,the catalyst Co/Ce_0.3Zr_0.7O_2-δ has the highest catalytic activity,with the lowest ignition temperature (T_10%) of 340℃,and the complete conversion temperature (T_90%) of 500℃.

王博磊(1995-),男,硕士研究生,研究方向为催化反应工程,1511253194@qq.com