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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%。
The composite oxide LaMgAlO was prepared by coprecipitation. The catalysts were characterized by XRD and DTA. The effects of LaMgAlO on the synthesis of DPC by transesterification of propanol and DMC were investigated. Performance. The experimental results show that when the composite oxide is n (La): n (Mg): n (Al) = 0.7: 3: 1 (ie 0.7 LaMgAlO catalyst has a hydrotalcite structure), calcined at 650 ° C. for 5 h 0.7 LaMgAlO catalyst has the highest activity for the transesterification of DPC. The optimal reaction conditions are: reaction temperature 90 ℃, n (propanol): DMC = 3, catalyst dosage 3.0% (w), reaction time 6 h. Under these conditions, the conversion of DMC reached 97.4% and the selectivity of DPC reached 95.4%.