复合氧化物LaMgAlO催化剂催化酯交换合成碳酸二丙酯

Synthesis of Dipropyl Carbonate by Transesterification on Composite Oxide Catalyst LaMgAlO

采用共沉淀法制备了复合氧化物LaMgAlO催化剂,采用XRD和DTA手段对催化剂进行了表征,并考察了LaMgAlO催化剂对丙醇与碳酸二甲酯(DMC)酯交换合成碳酸二丙酯(DPC)反应的性能。实验结果表明,当复合氧化物为n(La)∶n(Mg)∶n(Al)=0.7∶3∶1(即0.7 LaMgAlO催化剂具有水滑石结构)时,在650℃下焙烧5 h制备的0.7 LaMgAlO催化剂对合成DPC的酯交换反应的活性最高;最佳的工艺条件为:反应温度90℃、n(丙醇)∶n(DMC)=3、催化剂用量3.0%(w)、反应时间6 h,在此条件下,DMC的转化率达到97.4%,DPC的选择性达到95.4%。

Composite oxides LaMgAIO with different La amount were prepared by co-precipitation and were characterized by means of XRD and DTA. The performances of the catalysts for synthesis of dipropyl carbonate（DPC） through transesterification of dimethyl carbonate（DMC） with n-propanolwere investigated. The results indicated that when the molar ratio of La ： Mg ： AI was 0.7 ： 3 ： 1, the catalyst exhibited the highest catalytic activity. Under the optimum reaction conditions： 90℃, 6 h, n（n-propanol） ： n（DMC） 3 and amount of the DMC and the selectivity to DPC reached 97.4% catalyst in the reactants 3.0%（w）, the conversion of and 95.4%, respectively.