1. Graphene oxide grafted hydroxyl-functionalized ionic liquid: A highly efficient catalyst for cycloaddition of CO2 with epoxides.
- Author
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Zhang, Wei-Hong, He, Pan-Pan, Wu, Sheng, Xu, Jie, Li, Yongxin, Zhang, Gen, and Wei, Xian-Yong
- Subjects
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GRAPHENE oxide , *IONIC liquids , *RING formation (Chemistry) , *EPOXY compounds , *ATOMIC force microscopy - Abstract
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 CO 2 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 °C in 4 h. 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. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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