期刊
CHEMICAL ENGINEERING SCIENCE
卷 231, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.116267
关键词
Dimethyl carbonate; CO2; Propylene oxide; Alkali halide catalysts; Zn powder
资金
- EPSRC [EP/R026815/1, EP/K001329/1]
This study demonstrates that increased selectivity to DMC can be achieved under mild conditions by adding zinc powder, which also enhances the stability of the catalyst and prevents leaching of active ingredients on the catalyst surface.
Dimethyl carbonate (DMC) can be applied as a greener alternative to more hazardous materials, e.g. phosgene or dimethyl sulfate. Herein, one-pot synthesis of DMC from propylene oxide, methanol and CO2 using alkali halide catalysts under mild conditions was studied. Addition of Zn powder to the K2CO3 NaBr-ZnO catalyst system was seen to increase DMC selectivity from 19.8% (TOF = 39.0 h(-1)) to 40.2% (TOF = 78.1 h(-1)) at 20 bar and 160 degrees C for 5 h. Catalyst characterisation showed that Zn powder increases the stability of the catalyst, preventing the active ingredients on the catalyst surface from leaching. An increase in propylene oxide conversion to DMC is attributed to the increase of Zn2+ ions in the reaction solution. Elevated pressure was not found to be a necessary reaction condition for transesterification. This study shows that increased selectivity to DMC can be achieved at mild conditions with the addition of Zn powder. (C) 2020 Published by Elsevier Ltd.
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