Publication Details (including relevant citation information):
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.