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• W3022344259 abstract "The surface chemistry of an 8% Mo on alumina catalyst was varied by a previously described method which determines the extent of reduction, the hydroxyl concentration introduced into the molybdena layer, the number of anion vacancies formed by removal of H2O as the catalyst is reduced with H2, and the amount of reversibly adsorbed hydrogen, HR. The latter was found to correlate linearly with the vacancy concentration. The isomerization of cyclopropane was studied using a microcatalytic pulse technique at temperatures between 0 and 109°C. At a very low extent of reduction (H2 consumed as HC/Mo = 0.10 atom/atom) the mass balance was good when He-carrying gas was used and the only products observed were propene and a trace of ethene. As the extent of reduction was increased, however, nearly equal quantities of ethene and n-butenes appeared in the products in increasing amounts together with propene. Also, increasing amounts of carbonaceous material were retained by the catalyst. The isomerization reaction correlated linearly with the sum of the concentrations of vacancies and hydroxyls introduced as MoOH during the reduction with H2. Olefin metathesis and loss from the mass balance, on the other hand, could be correlated with vacancies, suggesting that these occur on coordinatively unsaturated Mo+4 centers. When H2-carrying gas was used, the olefins were completely hydrogenated under all conditions tested and the fraction of the cyclopropane reacted was increased considerably. At alow extent of reduction, the metathesis rate was about the same as in He as judged by the amount of ethane produced. As the extent of reduction was increased, however, both metathesis and formation of carbonaceous residues were repressed by H2 until propane was the only product. Hydrogenolysis of either cyclopropane or propane (to form methane) was not appreciable below 390°C. Both isomerization and metathesis were elevated temperatures, the isomerization reaction recovering faster with removal of H2O. Carbon monoxide was more weakly chemisorbed, but also exhibited poisoning effects." @default.
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• W3022344259 date "1977-01-01" @default.
• W3022344259 modified "2023-10-18" @default.
• W3022344259 title "Catalysis and surface chemistry" @default.
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• W3022344259 doi "https://doi.org/10.1016/0021-9797(77)90372-1" @default.
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