Ethylene oxide (EO) degradation over Ag/α-Al2O3 catalysts involves bifunctional pathways, whereby α-Al2O3 surfaces catalyze hydration, isomerization, dimerization, and oxidation while Ag surfaces facilitate combustion and isomerization of ethylene oxide. EO degradation reactions run over Ag/α-Al2O3, α-Al2O3, and intrapellet mixtures thereof with co-feeds of O2 and oxygenate products show that Ag surfaces are more reactive than α-Al2O3 and that oxygenate products generated over α-Al2O3 combust over Ag much more (>30x) readily than EO. These observations suggest that additives which mitigate surface hydration of α-Al2O3 and combustion activity of Ag will most effectively mitigate EO degradation.
Bibliographical noteFunding Information:
Parts of this work were carried out in the Characterization Facility, University of Minnesota , which receives partial support from NSF through the MRSEC program. The authors gratefully acknowledge Prof. David Poerschke and Ms. Eeshani Godbole for assistance with Al 2 O 3 synthesis and Prof. James Harris, Mr. Krishna Iyer, Mr. Brandon Foley, and Dr. Sandeep Dhingra for helpful technical discussions. The authors acknowledge generous funding from Dow through the University Partnership Initiative. JHM acknowledges financial support from the University of Minnesota Doctoral Dissertation Fellowship and a 3M departmental fellowship .
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- Ethylene oxide
- Reaction pathways