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 language | English (US) |
---|---|
Pages (from-to) | 6667-6678 |
Number of pages | 12 |
Journal | Catalysis Science and Technology |
Volume | 6 |
Issue number | 17 |
DOIs | |
State | Published - 2016 |
Bibliographical note
Publisher Copyright:© 2016 The Royal Society of Chemistry.