Victor Baldovino-Medrano - Factors controlling the development of the HYD route of desulfurization of DBT over γ-alumina supported Pt and Pd catalysts

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      Publication Details (including relevant citation   information):

      Catalysis Today, 150   (2010) Pages 186-195

      Abstract:

      The influence of the metallic precursor and the pretreatment of   γ-alumina supported Pt and Pd catalysts on the reactivity of   dibenzothiophene (DBT) over these materials was studied. It was   found that the use of chlorided precursors induces changes in the   chemical state of the metals and in the acidic properties of the   supported catalysts which are partly a function of the type of   noble metal. Such changes were found to positively affect the   conversion of DBT over both monometallic systems. Regardless of   the preparation conditions, Pt possesses a high activity and a   high selectivity to the direct route of desulfurization of DBT,   whereas Pd is less active but performs HDS with a strong tendency   to develop the hydrogenation route of desulfurization (HYD) when   employing a chlorided precursor. The use of a low temperature   pretreatment of the chlorided catalysts enhanced DBT conversion,   and for Pd/γ-Al2O3it doubled the   selectivity to HYD. The registered trends were considered to be   rather related to a change in the distribution of acidic sites of   the catalysts and to changes in the chemical state of the noble   metals than to the effect of dispersion.

      Keywords: Pt/γ-Al2O3;   Pd/γ-Al2O3; Chlorides; Pretreatment   conditions; Dibenzothiophene; HYD pathway; Acidity

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