非均相催化一步合成碳酸二苯酯ⅨCe的添加方法对Pd-Sn催化剂性能的影响  

Direct synthesis of diphenyl carbonate with heterogeneous catalysis reactionⅨ effect of Ce loading methods on catalytic activity of catalyst

作　　者：张光旭[1] 吴元欣[1] 马沛生[2] 吴广文[1] 李定或[1] 

机构地区：[1]武汉化工学院湖北省绿色化学与新型反应器重点实验室,湖北武汉430074 [2]天津大学化工学院一碳化工国家重点实验室,天津300072

出　　处：《化工学报》2005年第1期82-87,共6页CIESC Journal

基　　金：国家自然科学基金资助项目 (2 0 0 760 3 6)~~

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CeXSn1-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 .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 0.38MnO 3.But CeO 2 and Ce XSn 1-xO 2 were also detected in the catalyst prepared by sol-gel method;CeO 2 and SnO 2 were identified in the catalyst prepared by co-calcination method and CeO 2 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 S BET 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.

关 键 词：碳酸二苯酯 Pd-Sn催化剂 Ce的添加方法 

分 类 号：O643[理学—物理化学]