Factors determining the selectivity in the oxidative dehydrogenation of propane over boria-alumina catalysts
- Ruhr-Universitaet Bochum (Germany)
Boria-alumina catalysts are active in the selective oxidative dehydrogenation of propane. For undoped Al{sub 2}O{sub 3}, carbon oxides were the main products while the addition of B{sub 2}O{sub 3} led to a significant increase in propene selectivity; propene yields of 18% (selectivity = 57%) were achieved on B{sub 2}O{sub 3} (30 wt%)/Al{sub 2}O{sub 3} at 550{degrees}C. From pulse experiments with C{sub 3}D{sub 8} applying the temporal-analysis-of-products reactor and IR spectroscopic studies on surface hydroxyl groups it was derived that isolated hydroxyl groups on {gamma}-alumina being involved in the dissociative adsorption of propane are eliminated by adding boria. It can be tentatively assumed that the change in surface acidity caused by the absence of isolated OH groups is one of the reasons of the increase in propene selectivity in the oxidative dehydrogenation of propane.
- OSTI ID:
- 370204
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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