期刊
CHEMICAL ENGINEERING JOURNAL
卷 272, 期 -, 页码 92-101出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.03.008
关键词
Ethanol dehydration; Reaction path; Diethylether; Ethylene; Zeolites; Alumina
资金
- EMMA (Erasmus Mundus Mobility with Asia) in the framework of the EU Erasmus Mundus Action 2
The catalytic conversion of ethanol and diethyl ether (DEE) was studied over alumina, zeolites MFI, FER and USY, silica-alumina and calcined hydrotalcite. Zeolites, alumina and silica-alumina are active in the temperature range 453-573 K for both ethanol dehydration to DEE and to ethylene and for DEE cracking and hydrolysis, producing back ethanol and ethylene. Protonic zeolites are more active than alumina which is slightly more active than silica-alumina for these reactions. Ethanol dehydration to DEE occurs selectively at lower temperature with a bimolecular mechanism involving reaction of ethoxy groups with undissociated ethanol. Ethanol dehydration to ethylene occurs selectively at relatively high temperature with an elimination mechanism via decomposition of ethoxy groups over these catalysts, but also occurs, at lower temperature, with a consecutive path via DEE formation and cracking. (C) 2015 Elsevier B.V. All rights reserved.
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