Zn–Ca–Al mixed oxide as efficient catalyst for synthesis of propylene carbonate from urea and 1,2-propylene glycol

查看全文 作　　者：Sen [1,2]Liu;Suhong [2]Sun;Xuehui [2]Tian;Peiyong [2]Sun;Shenghong [2]Zhang;Zhilong [2]Yao

机构地区：[1]College of Chemical Engineering,Sichuan University;[2]Beijing Key Laboratory of Enze Biomass Fine Chemicals,College of Chemical Engineering,Beijing Institute of Petrochemical Technology

出　　处：《Chinese Journal of Chemical Engineering》索引2017年第25卷第5期,共8页

基　　金：Supported by the Changcheng Scholars Program of Beijing(CIT&TCD 20150316) 摘　　要：A series of Zn–Ca–Al oxides with different CaO and ZnO contents have been prepared and evaluated in the synthesis of propylene carbonate(PC) from 1,2-propylene glycol(PG) and urea in a batch reactor. The effect of catalyst composition, basicity and reaction process parameters such as temperature, catalyst dose, molar ratio of PG to urea, purge gas flow and reaction time has been studied to find suitable reaction conditions for the PC synthesis. The PC selectivity and yield under the desired conditions could reach 98.4% and 90.8%, respectively. The best performing catalyst also exhibited a good reusability without appreciable loss in the PC selectivity and yield after five consecutive reaction runs. In addition, a stepwise reaction pathway involving a 2-hydroxypropyl carbamate intermediate was proposed for the urea alcoholysis to PC in the presence of Zn–Ca–Al catalysts, according to the time dependences of reaction intermediates and products. 关键词：催化剂组成碳酸丙烯酯尿素醇解铝氧化物合成反应丙二醇复合氧化物 CA

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Zn–Ca–Al mixed oxide as efficient catalyst for synthesis of propylene carbonate from urea and 1,2-propylene glycol

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