The influence of sulfur dioxide on propane oxidation activity over supported platinum and palladium |
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Authors: | C. P. Hubbard K. Otto H. S. Gandhi K. Y. S. Ng |
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Affiliation: | (1) Chemical Engineering Department, Wayne State University, 5050 Anthony Wayne Dr., 48202 Detroit, MI, USA;(2) Ford Research Laboratory, Ford Motor Company, MD 3179, 48121-2053 Dearborn, MI, USA |
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Abstract: | Earlier studies have shown that sulfur dioxide and metal-support interaction can strongly influence propane oxidation over platinum. In particular, oxidation activity is enhanced when platinum is supported on sulfated -alumina or zirconia compared to -alumina. Therefore, it is of interest to compare the performance of palladium under the same experimental conditions. Four model catalysts were examined: Pt/-alumina, Pt/zirconia, Pd/-alumina and Pd/zirconia. The metal loading was kept at or below 0.05 wt% to emphasize changes in activity attributable to metal-support interaction. Reaction rates were measured with and without sulfur dioxide. Surface sulfation was analyzed by measuring acid strength and evaluating spectra obtained by Fourier-transform infrared spectroscopy. In contrast to platinum, sulfation does not promote propane oxidation on Pd/-alumina, and Pd/zirconia is less active than Pd/-alumina. |
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Keywords: | propane oxidation platinum palladium sulfur dioxide alumina zirconia activity acidity kinetics |
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