4.6 Article

Graphene oxide grafted hydroxyl-functionalized ionic liquid: A highly efficient catalyst for cycloaddition of CO2 with epoxides

期刊

APPLIED CATALYSIS A-GENERAL
卷 509, 期 -, 页码 111-117

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ELSEVIER
DOI: 10.1016/j.apcata.2015.10.038

关键词

Graphene oxide; Hydroxyl ionic liquid; Epoxide; CO2; Cyclic carbonate

资金

  1. National Natural Science Foundation of China [21376032]
  2. Open Foundation of Jiangsu Key Laboratory of Fine Petrochemical Engineering

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A grafted 1-(2-hydroxyl-ethyl)-imidazolium-based ionic liquid (GO-HEIMBr) was developed via immobilizing 2-bromoethanol onto an imidazole-modified graphene oxide, which was prepared in a one-pot process. The physicochemical properties of GO-HEIMBr were characterized by atomic force microscopy, X-ray photoelectron spectroscopy, thermogravimetry analysis, Fourier transform infrared spectroscopy, and elemental analysis. In the solvent-free cycloaddition reactions of CO2 with epoxides to cyclic carbonates, GO-HEIMBr exhibited excellent catalytic activities. A maximum yield of the target cyclic carbonate arrived at 99% using 0.35 mol% catalysts at 140 degrees C in 4h. In addition, the catalyst could be easily recovered and reused for seven times without significant loss of activity. A possible catalytic mechanism was proposed for the cycloaddition over GO-HEIMBr. (C) 2015 Elsevier B.V. All rights reserved.

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