磁性氧化镁催化尿素与1,2-丙二醇合成碳酸丙烯酯的研究  

Synthesis of propylene carbonate from urea and 1,2-propylene glycol over magnetic magnesium oxide catalysts

作　　者：张斌[1] 陈晓亚[1] 罗聪颖[1] 邵俊泉[1] 章亚东[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001

出　　处：《现代化工》2017年第7期91-95,共5页Modern Chemical Industry

摘　　要：以磁性复合微粒SiO_2/Fe_3O_4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.

关 键 词：磁性氧化镁 尿素 1 2-丙二醇 碳酸丙烯酯 催化 

分 类 号：TQ203.2[化学工程—有机化工]