1981•Journal of CatalysisRequires access
Effects of SO/sub 2/ on the oxidation of hydrocarbons and carbon monoxide over Pt/. gamma. -Al/sub 2/O/sub 3/ catalysts
Haoyu Yao, Henry K. Stepien, Haren S. Gandhi
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Abstract
Results obtained from a flow reactor indicate that SO/sub 2/ in the feed gas enhances propane oxidation but suppresses both propylene and carbon monoxide oxidations over a Pt/..gamma..-Al/sub 2/O/sub 3/ catalyst. These results are interpreted on the basis of the infrared data, which show the formation of the surface sulfates on ..gamma..-Al/sub 2/O/sub 3/ after the SO/sub 2/ adsorption and oxidation, and the effects of the surface sulfates on the chemisorption properties of a Pt/..gamma..-Al/sub 2/O/sub 3/ catalyst. It is suggested that the surface sulfates on ..gamma..-Al/sub 2/O/sub 3/ enhance C/sub 3/H/sub 8/ oxidation by increasing the dissociative C/sub 3/H/sub 8/ adsorption on Pt and suppress both CO and C/sub 3/H/sub 6/ oxidations by decreasing the associative CO and C/sub 3/H/sub 6/ adsorptions on Pt.