Abstract
Hydrogenation of cyclohexene and benzene on nickel-tungsten sulfide and tungsten disulfide are compared. The hydrogenation activity of these catalysts had been attributed to tungsten ions in the surface of WS 2 crystallites. Comparison of catalysts with and without nickel corroborates this. The role of nickel in multiplying the number of active tungsten sites is evaluated. Possible adsorption mechanisms for cyclohexene and benzene on such sites are discussed. Differences between the hydrogenation of benzene and cyclohexene, as well as the effect of nickel, are explained on the basis of a discussion of the nature of the active sites.
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