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通过浸渍法制备了负载Cu的镁铝水滑石类化合物Cu/HT,经过450℃焙烧得到负载Cu的镁铝复合金属氧化物Cu/LDO,利用X射线衍射(XRD)、红外光谱(FTIR)分析等技术对催化剂的结构进行了表征。研究了其对尿素与1,2-丙二醇合成碳酸丙烯酯的催化性能。考察了反应温度、反应时间、催化剂用量等工艺条件对反应性能的影响。结果表明,以水滑石为前躯体的负载Cu的镁铝复合金属氧化物cu/LDO对尿素与1,2-丙二醇合成碳酸丙烯酯具有比较好的催化活性。当反应温度为170℃、1,2-丙二醇与尿素的摩尔比为4:1、催化剂用量为原料总质量的1.0%、反应时间为3h时,碳酸丙烯酯的收率达到95.2%。
Cu / HT Cu / HT Cu-loaded Mg-Al hydrotalcites was prepared by impregnation method. After calcination at 450 ℃, Cu / LDO was loaded on Cu-loaded Mg-Al composite metal oxides and characterized by XRD and FTIR Technology such as catalyst structure was characterized. The catalytic properties of propylene carbonate synthesized from urea and 1,2-propanediol were studied. The effects of reaction conditions such as reaction temperature, reaction time and amount of catalyst on the reaction performance were investigated. The results show that the Cu / LDO Cu / LDO loaded with hydrotalcite as precursor has a good catalytic activity for the synthesis of propylene carbonate from urea and 1,2-propanediol. When the reaction temperature is 170 ℃, the molar ratio of 1,2 - propanediol to urea is 4: 1, the amount of catalyst is 1.0% of the total mass of the raw materials and the reaction time is 3h, the yield of propylene carbonate reaches 95.2%.