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ժҪ ��ԭλ��Ҵ��Ͷ��̼��ﯴ߻��ºϳ�̼��(DEC)�ķ�Ӧ��о��Ҵ��ǻ��ϵ��ԭ��ﯱ��Zr4+�໥��,��ﯱ��ǻ��Ӧ�γ��(��λ��Ͷ��λ��)��ˮ,��̼��Ҫ�뵥��λ��뷴Ӧ�γ��һ�̼��;��̼��ﯱ��浥��ʱ�γ�̼��κ�̼��,�Ҵ��̼��κ�̼��ξ��ɷ�Ӧ�γ��м��һ�̼��,��̬�Ķ��̼��ȷ�Ӧ��,�Ҵ��̼��Ӧ��Ҫ��̬��CO2��뷴Ӧ��ʽ��С��һ�̼��Ҵ��ﯱ��淴Ӧ�γ��ǻ��̼��

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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.

Keywords��

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

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��ԭ;��;��±�;.�Ҵ��CO_2ֱ�Ӻϳ�̼��ԭλ��о�[J]. ��ѧ��ҵ�빤��, 2009,26(1): 44-49

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, 2009,26(1): 44-49

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