文献类型：期刊文献

英文题名：Preparation of propylene carbonate by alcoholysis of urea from the perspective of homogeneous reaction: Influence of dissolution and precipitation of metal oxide catalysts

作者：Yang, Fei[1];Shen, Weihua[1];Fang, Yunjin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai, Peoples R China

年份：2023

卷号：101

期号：5

起止页码：2790

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20225013220592);WOS:【SCI-EXPANDED(收录号:WOS:000888984300001)】；

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：1; 2-propylene glycol; homogeneous reaction; metal oxide; propylene carbonate; urea

摘要：The dissolution process of metal oxide catalysts in the alcoholysis of urea by 1, 2-propylene glycol (PG) to the synthesis of propylene carbonate (PC) was investigated. It was found that the reaction was mainly catalyzed by homogeneous catalysts. The metal oxide reacted with ammonia and isocyanate acid, the decomposition products of urea, to form a complex and dissolved into the reaction system. The dissolved amount of catalyst was positively correlated with the PC yield by using different oxides and salts as catalysts. The Fourier-transform infrared spectroscopy (FTIR) result of the catalysts reacting with urea showed that the dissolution-precipitation process of the catalysts was related to the decomposition of urea. The results of catalytic test indicated that both the dissolved amount of catalysts and the structure of the complex affected PC yields. A reaction mechanism was proposed based on the results. From the mechanism, a complex catalyst with at least two ammonia ligands is better for this reaction.