Journal
JOURNAL OF CATALYSIS
Volume 389, Issue -, Pages 714-720Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.07.008
Keywords
Ethylene oxide; Reaction pathways; Ag; alpha-Al2O3; Epoxidation
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Funding
- NSF through the MRSEC program
- Dow through the University Partnership Initiative
- University of Minnesota Doctoral Dissertation Fellowship
- 3M departmental fellowship
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Ethylene oxide (EO) degradation over Ag/alpha-Al2O3 catalysts involves bifunctional pathways, whereby alpha-Al2O3 surfaces catalyze hydration, isomerization, dimerization, and oxidation while Ag surfaces facilitate combustion and isomerization of ethylene oxide. EO degradation reactions run over Ag/alpha-Al2O3, alpha-Al2O3, and intrapellet mixtures thereof with co-feeds of O-2 and oxygenate products show that Ag surfaces are more reactive than alpha-Al2O3 and that oxygenate products generated over alpha-Al2O3 combust over Ag much more (>30x) readily than EO. These observations suggest that additives which mitigate surface hydration of alpha-Al2O3 and combustion activity of Ag will most effectively mitigate EO degradation. (C) 2020 Elsevier Inc. All rights reserved.
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