Effects of support material and sulfation on propane oxidation activity over platinum
- Wayne State Univ., Detroit, MI (United States)
- Ford Motor Company, Dearborn, MI (United States)
Propane oxidation is used as a model reaction to study effects of platinum concentration, support material, and catalyst sulfation. Support materials examined are [gamma]-alumina, zirconia, and silica in a platinum dispersion range from about 0.05 to 1.0. Experiments are conducted with recirculation batch and integral flow reactors. For highly dispersed platinum, the activity decreases in the order zirconia > silica > [gamma]-alumina. Over larger platinum particles, the batch experiments show the same turnover rate on the three supports. On highly dispersed platinum, sulfation, via SO[sub 2] oxidation or H[sub 2]SO[sub 4] exposure, significantly increases the catalytic activity of Pt/[gamma]-alumina, while Pt/silica and Pt/zirconia remain unaffected. Surface acid strength is measured with Hammett indicators. Upon sulfation, the acid strength of zirconia and [gamma]-alumina increases, while no change is observed for silica. Acid strength does not have a major influence on propane-oxidation activity. Within the experimental error, the apparent activation energy for propane oxidation is independent of metal concentration, support material, and sulfation, suggesting that changes in activity are primarily the result of a change in reaction-site density. 29 refs., 9 figs., 4 tabs.
- OSTI ID:
- 5154815
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 144:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
ENERGY
HYDROCARBONS
METALS
MINERALS
ORGANIC COMPOUNDS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PROPANE
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES