Abstract
Supporting Wilkinson's complex on γ-Al 2O 3 rendered a high active catalyst for cyclohexene to cyclohexane hydrogenation. The activity was higher than that of the same complex unsupported, in the presence or absence of a S-containing poison (tetrahydrothiophene). XPS results suggested that, after poisoning, there was an insertion of a sulfur atom into the rhodium coordination sphere. Comparison of Wilkinson's complex with other palladium and nickel complexes was also made. The Wilkinson's complex proved to be more active and sulfur resistant than the Pd and Ni complexes in both homogeneous and heterogeneous conditions. For the Pd and Ni complexes there was a change in the coordination sphere after poisoning, as shown by the XPS results.
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