文献类型：期刊文献

英文题名：Immobilization of polyoxometalate-based ionic liquid on carboxymethyl cellulose for epoxidation of olefins

作者：Hua, Li[1];Chen, Jizhong[1];Chen, Chen[1];Zhu, Wenwen[1];Yu, Yinyin[1];Zhang, Ran[1];Guo, Li[1];Song, Baoning[1];Gan, Huimei[1];Hou, Zhenshan[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2014

卷号：38

期号：8

起止页码：3953

外文期刊名：NEW JOURNAL OF CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000339469500080)】；

基金：The authors are grateful for support from the National Natural Science Foundation of China (21073058, 21373082, U1179302), the Research Fund for the Doctoral Program of Higher Education of China (20100074110014), and the Fundamental Research Funds for the Central Universities.

语种：英文

摘要：A novel ionic liquid consisting of a PEG-functionalized ammonium cation and a lacunary-type phosphotungstate anion was synthesized and characterized structurally. The ionic liquid was then immobilized onto environmentally benign polymer-carboxymethyl cellulose by two different routes: the impregnation method and the co-precipitation method. The immobilized ionic liquid can be used as a catalyst for olefin epoxidation with aqueous hydrogen peroxide in ethyl acetate. It was found that both of the immobilized ionic liquid catalysts showed better catalytic activities and stability than the homogeneous analogue in consecutive runs. In particular, the ionic liquid catalyst immobilized by the co-precipitation method afforded a higher catalytic stability than the catalyst immobilized by the impregnation method. It is suggested that the crucial factor influencing the catalytic performance is the difference in the interactions between the heteropoly anions and the polymer supports.