文献类型：期刊文献

英文题名：Polyoxometalate and copolymer-functionalized ionic liquid catalyst for esterification

作者：Li, Huan[1];Chen, Jizhong[1];Hua, Li[1];Qiao, Yunxiang[1];Yu, Yinyin[1];Pan, Zhenyan[1];Yang, Hanming[2,3];Hou, Zhenshan[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]S Cent Univ Nationalities, State Ethn Affairs Commiss, Key Lab Catalysis & Mat Sci, Wuhan 430074, Hubei Province, Peoples R China;[3]S Cent Univ Nationalities, Minist Educ, Wuhan 430074, Hubei Province, Peoples R China

年份：2012

卷号：84

期号：3

起止页码：541

外文期刊名：PURE AND APPLIED CHEMISTRY

收录：;EI(收录号：20121114866757);WOS:【SCI-EXPANDED(收录号:WOS:000301282100011)】；

基金：The authors are grateful for the support from the National Natural Science Foundation of China (Nos. 20773037 and 21073058), Research Fund for the Doctoral Program of Higher Education of China (20100074110014), and Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, Hubei Province, South-Central University for Nationalities (No. CHCL10001), China. The authors would also like to express their thanks for Prof. Walter Leitner's helpful suggestion and Dr. Nils Theyssen's assistance.

语种：英文

外文关键词：catalysis; emulsion; esterification; ionic liquids; phase separation; polyoxometalates

摘要：A new room-temperature ionic liquid (RTIL) consisting of a polyoxometalate (POM) anion and tri-block copolymer (P123)-functionalized imidazolium cation was synthesized and utilized as a halogen-free catalyst for esterification. The catalytic system was a homogeneous solution at the beginning of the reaction, but an emulsion formed during the course of the reaction, and a progressive phase separation of the catalyst occurred at 0 degrees C over the course of 3 h. Dynamic light scattering (DLS), transmission electron microscopy (TEM), and Fourier transform/infrared spectroscopy (FT/IR) have been used to characterize the properties of the IL during the reaction. The new IL catalyst was found to be highly efficient in the esterification of various alcohols and can be recycled at least seven times.