In-situ Infrared Study on Direct Synthesis of Diethyl Carbonate from Ethanol and CO

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Abstract In-situ infrared spectroscopy has been used to investigate the mechanism of diethyl carbonate(DEC) synthesis from ethanol and carbon dioxide.The atom O of ethanol coordinates with unsaturated Zr~(4+) cations presenting at the catalyst surface to form two kinds of ethoxide(monodentate and bidentate) and simultaneously proton is released,which reacts with hydroxyl group on the ZrO_2 surface to produce water.Dissociative carbon dioxide inserts into the(Zr��O) to form ethyl carbonate group((Zr��OC(O))CH_2CH_3)) as a mediate species,carbon dioxide adsorbs on the ZrO_2 catalyst as carbonate and bicarbonate species,both of which can react with ethanol to form(Zr��OC(O))CH_2CH_3).Compared with reaction of dissociative carbon dioxide,this process is slower.DEC is formed by reaction of the ethyl carbonate species with ethanol on the surface of ZrO_2.

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Received 2009-01-15; published 2009-01-15

Cite this article:

CAO Xin-yuan,WANG Wei,MA Xin-bin.In-situ Infrared Study on Direct Synthesis of Diethyl Carbonate from Ethanol and CO_2[J] Chemcial Industry and Engineering, 2009,V26(1): 44-49

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