文献类型：期刊文献

英文题名：Mechanically mixedZnO-Al2O3catalysts in the synthesis of propylene carbonate via alcoholysis of urea

作者：Jia, Yuchen[1];Lv, Lei[1];Nie, Yingying[2];Jiao, Linyu[3];Shen, Weihua[1];Zhu, Zhiqing[1];Fang, Yunjin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shaamd Coal Chem Ind Technol Res Inst Co Ltd, Xian, Peoples R China;[3]Northwest Univ, Sch Chem Engn, Xian, Peoples R China

年份：2021

卷号：99

期号：1

起止页码：374

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20203409079575);WOS:【SCI-EXPANDED(收录号:WOS:000560253600001)】；

基金：National Natural Science Foundation of China, Grant/Award Number: 21576083; Natural Science Basic Research Program of Shaanxi - Shaanxi Coal and Chemical Industry Joint Foundation, Grant/Award Number: 2019JLM-20

语种：英文

外文关键词：mechanically mixed catalyst; propylene carbonate; urea alcoholysis; ZnO-Al(2)O(3)catalyst

摘要：Alcoholysis of urea with 1,2-propylene glycol (PG) is a potential industrial process for the synthesis of propylene carbonate (PC) with many advantages. However, the preparation of industrial catalysts such as Zn-Al oxide by the co-precipitation method will inevitably produce a large amount of salty water and building desalting equipment will increase the investment cost. The present work attempts to use a mechanically mixed catalyst consisting of commercial ZnO and Al(2)O(3)to solve these problems. This type of catalyst was capable of catalyzing the reaction more than 5 times. The PC yield was gradually increased with each use. The best PC yield of 96.7% is comparable to the co-precipitated Zn-Al oxide catalysts and was achieved during the third use. In the reaction, ZnO and Al(2)O(3)were dissolved into the reactants to form complexes, which homogenously catalyzed the reaction. It was found that the dissolved Zn and Al complex significantly influenced the PC yield and re-precipitated in the late stage of the reaction. Furthermore, the partial dissolution of Al assisted the dissolution and precipitation of Zn, which improved the PC yield. After several dissolution-precipitation cycles, ZnO-Al(2)O(3)was homogeneously mixed at the atomic scale. Interestingly, there was an adequate linear relationship between the amount of dissolved Zn and Al in each reaction, the linear correlation coefficient improved after each reaction, and the slope of the line (the ratio of dissolved Zn/Al) was 7.26 in the third use.