柠檬酸络合法微波烧结制备复合氧化物La_(1-x)Pb_xMnO_3

Microwave Synthesis of Mixed Oxide Carrier La_(1-X)Pb_xMnO_3 by Citric Acid Complex Method

采用柠檬酸络合法微波烧结制备了钙钛矿型复合氧化物La1-xPbxMnO3(x=0.2、0.3、0.5、0.6、0.8)载体,并用XRD、SEM及BET对制备的载体进行了表征。实验结果表明:微波烧结15min时可得到结晶性较好的单相钙钛矿型复合氧化物,且载体的孔径分布较好,空隙率较大。用沉淀法将活性组分Pd负载于载体上制得的非均相催化剂进行碳酸二苯酯(DPC)合成实验,结果表明所制催化剂活性较好,产品DPC的收率在7%左右。

The perovskite - type compound oxides La1-xPbxMnO3（x = 0.2, 0.3, 0.5, 0.6, 0.8） were prepared by citric acid complex method and calcined by microware, and characterized by XRD, SEM and BET. The results showed that the compound oxide can be formed well by microware calcined for 15 min, and its particle and pore size distribution are homogenous. In addition, the syntheses of diphenyl carbonate（DPC） were carried out by the catalysts impregnated with active component Pd solution in the prepared perovskite - type compound oxides, and the results showed that the catalyst calcined by microware for 15 min has good catalytic activity and the yield of DPC is about 7%.