期刊
APPLIED CATALYSIS A-GENERAL
卷 484, 期 -, 页码 26-32出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2014.07.008
关键词
Carbon dioxide fixation; Cycloaddition reaction; Chitosan; Quarternaty phosphonium ionic liquid; Cyclic carbonate
资金
- National Natural Science Foundation of China [51104089, 51238002, 51272099]
- Natural Science Foundation of Jiangxi Province [20122BAB213013]
- NCHKU
We prepared chitosan-grafted quarternary phosphonium ionic liquid (1-butyl-triphenylphosphonium bromide) by a simple method and used it as catalyst for the synthesis of cyclic carbonates through CO2 cycloaddition to epoxides in the absence of co-catalyst and solvent. High yield of propylene carbonate (96.3%) is obtained at 120 degrees C and 2.5 MPa in 4 h. We studied the roles of chitosan hydroxyl groups and ionic liquid counter anions on catalytic activity. It is proposed that the facilitation of ring opening of epoxides is a combined result of polarization (by hydrogen bonding due to hydroxyl groups), electronic interaction (by [BuPh3P](+)), and nucleophilic attack (by bromide anion). The catalyst can be easily recovered and reused as demonstrated in a test of five runs without showing any significant loss of activity. From the view point of commercial application, the catalyst is attractive because it is low-cost, ecology-safe, stable and efficient. Furthermore, it is potentially applicable for fixed-bed continuous flow reactors. (C) 2014 Elsevier B.V. All rights reserved.
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