Victor Baldovino-Medrano - Reactivity of dibenzothiophene type molecules over Pd catalysts

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  Journal of Molecular Catalysis A: Chemical Volume 301, Issues   1–2, 18 March 2009, Pages 127–133


    The reactivity of dibenzothiophene (DBT) over   Pd/γ-Al2O3    catalysts and the possible nature of the Pd active phase were   analyzed. DBT conversion was studied as a function of the   activating agent, the temperature, and in the presence of   naphthalene (NP). Pd showed a high selectivity to the   hydrogenation (HYD) route of DBT hydrodesulfurization (HDS).   However, activation with H2S   decreased HYD selectivity. A reaction mechanism for the DBT   conversion over Pd catalysts via HYD was proposed based on the   mechanism usually accepted for aromatics hydrogenation. This   mechanism comprises the initial saturation of one of the aromatic   rings of DBT and a consecutive   roll-over   of the molecule onto the Pd surface. NP was found to inhibit HYD.   Finally, the catalytic performance of Pd in HDS was found to   agree well with the characteristics of a Pd metallic active   phase.

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