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Issue 21, 2018
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Direct synthesis of diethyl carbonate from ethanol and carbon dioxide over ceria catalysts

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Abstract

Direct synthesis of diethyl carbonate (DEC) by carboxylation of ethanol with CO2 was investigated over ceria catalysts. 2-Cyanopyridine (2-CP) was used for trapping water formed in the reaction and to shift the equilibrium towards the product side. An optimal dependence (“volcanic plot”) of the catalytic activity on the acidity/basicity molar ratio was observed. “Neat” ceria (procured from Daiichi Kigenso Kagaku Kogyo Co. Ltd, Japan) showed higher catalytic activity than metal incorporated ceria catalysts. CeO2 had the right kind of acidity/basicity ratio to activate ethanol and CO2 simultaneously, yielding DEC. The catalyst was reusable. The yield of DEC obtained in this study using the commercial catalyst was higher than that reported by others using ceria catalysts prepared by other methods. Under optimum conditions (ethanol : 2-CP molar ratio = 2 : 1, catalyst = 2.17 wt% with respect to ethanol, CO2 pressure = 40 bar, reaction temperature = 150 °C and reaction time = 3 h) in a batch reaction, a DEC yield as high as 45 mol% (i.e., 38.7 mmol mmol−1 of CeO2) was obtained.

Graphical abstract: Direct synthesis of diethyl carbonate from ethanol and carbon dioxide over ceria catalysts

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Publication details

The article was received on 14 Aug 2018, accepted on 14 Sep 2018 and first published on 17 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ04090G
Citation: New J. Chem., 2018,42, 17546-17552

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    Direct synthesis of diethyl carbonate from ethanol and carbon dioxide over ceria catalysts

    G. G. Giram, V. V. Bokade and S. Darbha, New J. Chem., 2018, 42, 17546
    DOI: 10.1039/C8NJ04090G

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