Abstract
A quantitative kinetic study of the liquid phase hydrogenation of 1-butene, 1,3-butadiene and 1-butyne hydrogenation on platinum supported catalysts has been performed. The hydrogenation of 1-butene and 1,3-butadiene is compatible with a simple Langmuir-Hinshelwood kinetic equation, whereas the hydrogenation of 1-butyne is not. The comparative apparent sensitivities to metal dispersion distinguishes similarly the 1-butyne, which is sensitive, from the others, which are not. All the experimental data are well interpreted by a “multicomplexation” mechanism where the surface atoms of low coordination number are reversibly deactivated by the adsorption of two molecules of 1-butyne.
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