Journal
JOURNAL OF CATALYSIS
Volume 271, Issue 2, Pages 251-261Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.01.021
Keywords
Ethanol dehydration; Zeolite; Mordenite; Ethylene; Diethyl ether; Shape selectivity; Parallel reactions; Size exclusion
Categories
Funding
- Institute on the Environment
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The effects of zeolite topology on the dehydration of oxygen-containing molecules were probed in steady-state and isotopic chemical reactions of ethanol over proton-form zeolite materials (FER, MFI and MOR) at low temperatures (368-409 K). The measured rate of diethyl ether (DEE) synthesis was largely independent of ethanol partial pressure on all proton-form zeolites (FER, MFI, and MOR), indicating that DEE formation involves the activation of ethanol dimers. The measured rate of DEE synthesis over H-FER increased with increasing ethylene pressure in experiments done with ethanol-ethylene mixtures, reflecting the weaker adsorption of ethanol dimers on the FER framework compared to that on MFI and MOR materials, thereby resulting in the co-adsorption and reaction of ethylene with ethanol on FER materials. Ethylene production was only observed on H-MOR because the small eight-membered ring side pockets protect ethanol monomers from forming bulky ethanol dimers. Secondary kinetic isotopic effects measured for ethylene synthesis rates using C2D5OH reactants imply that the kinetically relevant step involves the cleavage of C-O bonds via a carbenium-ion transition state. (C) 2010 Elsevier Inc. All rights reserved.
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