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- W1554500980 abstract "The supported molybdenum clusters previously described [1] were tested for their potential activity in the catalysis of cumene hydrocracking, thiophene hydrogenolysis, propene hydrogenation and, in some instances, gas oil hydrocracking. The effect of modifying the alumina support by the addition of fluoride ion was also investigated for those materials which showed promising catalytic activity, and the molybdenum loading was varied over the calculated range 4 – 10%. The effect of cobalt and nickel promoters was then examined. The results were compared with those obtained from conventional catalysts, prepared by impregnation of γ-alumina with molybdate with and without fluoride, cobalt and nickel additives. The most active catalysts tested were those prepared from the hexanuclear cluster, (H3O+)2[Mo6Cl14]2−·6H2O. These catalysts gave surprisingly high conversions in cumene hydrocracking, and had substantial activity in HDS studies. As hydrocracking catalysts for application to commercial feedstocks they showed considerable promise, especially when the Mo loading factor was taken into account. XPS studies of one of this series of catalysts suggested that in the hydrocracking of cumene and in the hydrodesulfurization of thiophene, the integrity of the cluster is destroyed during use, and hence the clusters should be regarded as precursors of the active catalytic species rather than being the active species themselves." @default.
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- W1554500980 date "1989-08-01" @default.
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- W1554500980 title "A study of supported molybdenum cluster complexes as catalyst precursors" @default.
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- W1554500980 doi "https://doi.org/10.1016/0304-5102(89)80070-7" @default.
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