Abstract: Supported Pd-Sn-Ce catalysts for direct synthesis of diphenyl carbonate (DPC) were prepared with three different Ce loading methods that were sol-gel，co-calcination and precipitation methods.The characterization of the catalysts prepared with different Ce loading methods were investigated by XRD and TPR respectively,and the results showed that the main crystal phases in the different catalysts were all La_0.62 Pb_0.38MnO₃.But CeO₂ and Ce_XSn_1-xO₂ were also detected in the catalyst prepared by sol-gel method;CeO₂ and SnO₂ were identified in the catalyst prepared by co-calcination method and CeO₂ was discovered in the catalyst prepared by precipitation method, too.Specific surface areas of catalysts prepared with different Ce loading methods were determined by SEM and specific surface area instrument, the results showed the SBET of catalyst prepared by sol-gel method was larger than that of the others.The synthesis of DPC was carried out and it was found that the activity and life of catalyst prepared by sol-gel was better than that of the others.Furthermore,optimization of synthesis conditions for different catalysts was also carried out respectively.

Key words: 碳酸二苯酯, Pd-Sn催化剂, Ce的添加方法

摘要： 通过XRD、TPR对不同的Ce添加方法所得催化剂进行了表征，结果表明用溶胶-凝胶法所得催化剂中Ce、Sn主要以Ce_XSn_1-xO₂物相存在.用混烧法所得催化剂中，Ce和Sn分别以CeO₂、SnO₂物相形式存在，而用沉淀法所得的催化剂中，Ce则以CeO₂晶相的形式存在，Sn与载体其他元素形成了共融体.对3种催化剂的形貌和比表面积进行了表征，结果表明溶胶-凝胶法所得催化剂的表面呈蜂窝状、比表面积较大.用碳酸二苯酯（DPC）的合成实验对催化剂的活性及催化剂的寿命进行评价，结果表明无论是催化剂的活性还是催化剂的寿命，溶胶-凝胶法所得催化剂较好.此外还对DPC合成工艺条件进行优化.

关键词: 碳酸二苯酯, Pd-Sn催化剂, Ce的添加方法