以磁性复合微粒SiO₂/Fe₃O₄为载体，采用浸渍法制备了磁性氧化镁催化剂，并用IR和XRD对其进行表征，考察了催化剂对尿素与1，2-丙二醇合成碳酸丙烯酯反应的影响。以硝酸镁为前驱体，负载量（质量分数）为25%，在600℃下焙烧制得的催化剂催化活性最好。通过对实验结果进行分析，得到最优反应条件：催化剂质量分数（占反应物总质量）1.0%，n（PG）∶n（尿素）=2∶1，反应时间为3 h，反应温度为180℃。在此反应条件下，PC的最高收率达到89.49%。反应为多相催化体系，因催化剂有磁性，在磁场环境下可方便实现催化剂与产物的分离。

Through the impregnation method,the magnetic magnesium oxide catalysts are prepared by using magnetic composite microparticles SiO₂/Fe₃O₄ as carrier and are characterized by IR and X-ray diffraction.The influences of the prepared catalysts on synthesis of propylene carbonate by urea and 1,2-propylene glycol are studied.The catalyst prepared by using magnesium nitrate as precursor with a loading amount of 25% (mass fraction),and being calcined at 600℃ has the best catalytic activity.Through analysis on the experimental results,the optimum reaction conditions are obtained as follows:catalyst mass fraction (accounting in all reaction materials) is 1.0%,n(1,2-propanediol):n(urea)=2:1,reaction time is 3 h and reaction temperature is 180℃.Under the optimal reaction conditions,the highest yield of propylene carbonate is up to 89.49%.The reaction is a heterogeneous catalytic system,and the catalyst can be easily separated from the products in the magnetic field environment due to the magnetic properties of the catalyst.

张斌(1990-),男,硕士研究生,694067830@qq.com