Abstract: 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, 陈晓亚, 罗聪颖, 邵俊泉, 章亚东. 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[J]. 现代化工, 2017, 37(7): 91-95.
ZHANG Bin, CHEN Xiao-ya, LUO Cong-ying, SHAO Jun-quan, ZHANG Ya-dong. Synthesis of propylene carbonate from urea and 1,2-propylene glycol over magnetic magnesium oxide catalysts. Modern Chemical Industry, 2017, 37(7): 91-95.
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