Journal
JOURNAL OF CATALYSIS
Volume 220, Issue 1, Pages 44-46Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9517(03)00238-0
Keywords
zinc halide; imidazolium halide; zinc tetrahalide; ionic liquid; ethylene oxide; propylene oxide; carbon dioxide; cyclic carbonate; ethylene carbonate; propylene carbonate
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Imidazolium zinc tetrahalides, (1-R-3-methylimidazolium)(2)ZnX2Y2 (R = CH3, C2H5, n-C4H9, CH2C6H5; X = Cl, Br; Y = Cl, Br), prepared by reacting ZnX2 with (1-R-3-methylimidazolium)Y, were found to have surprisingly high activities for the coupling reaction of CO2 and ethylene oxide or propylene oxide to produce corresponding cyclic carbonate. The catalytic activity of imidazolium zinc tetrahalide was greatly influenced by the nature of halide groups bonded to the zinc center. The catalytic activity was found in the order of [ZnBr4](2-) > [ZnBr2C](2-) much greater than [ZnCl4](2-). The turnover frequencies (TOF: h(-1)) increased with increasing temperature, but remained almost unchanged with the increase of pressure. (C) 2003 Elsevier Inc. All rights reserved.
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