Kinetics and mechanisms of alcohol dehydration pathways on alumina materials

Minje Kang, Aditya Bhan

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The steady state rates of ethene and diethyl ether formation in parallel ethanol dehydration reactions at 573 and 623 K are mechanistically and kinetically described by the same rate expression on different alumina materials (α-, γ-, and η-Al2O3), implying that alumina materials have similar surface sites under reaction environments. In situ chemical titration using pyridine as a titrant elucidates similar site densities (∼0.12 sites nm-2 and ∼0.07 sites nm-2 for ethene formation and ∼0.14 sites nm-2 and ∼0.09 sites nm-2 for diethyl ether formation on γ- and η-Al2O3, respectively) on γ- and η-Al2O3 indicating that similar surface features exist on both γ- and η-Al2O3. Pyridine-ethanol co-feed experiments show that pyridine inhibited the formation of ethene to a greater extent than diethyl ether suggesting that the two parallel dehydration reactions are not catalyzed by a common active site.

Original languageEnglish (US)
Pages (from-to)6667-6678
Number of pages12
JournalCatalysis Science and Technology
Volume6
Issue number17
DOIs
StatePublished - 2016

Bibliographical note

Funding Information:
We appreciate financial support from The Dow Chemical Company. We also acknowledge Dr. Donghun Kim for taking SEM images and Dr. Hsu Chiang and Joseph F. DeWilde for helpful technical discussions.

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

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