Victor Baldovino-Medrano - Development of the HYD route of hydrodesulfurization of dibenzothiophenes over Pd–Pt/γ-Al2O3 catalysts

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      Publication Details (including relevant citation   information):

      V.G. Baldovino-Medrano, P. Eloy

      Journal of Catalysis Volume 267 (2009)  Pages 129-139

      Abstract:

      The hydrodesulfurization (HDS) of dibenzothiophene (DBT) on a   series of Pd–Pt/γ-Al2O3 catalysts   was studied as a function of the Pd/(Pd + Pt) molar ratio at   different reaction conditions. It was determined that the   catalytic performance in HDS is controlled by the Pd/(Pd + Pt)   molar ratio. In particular, a synergetic effect exists rather in   the development of the hydrogenation (HYD) route of HDS of   dibenzothiophene than in the activity, but both can be controlled   from the Pd/(Pd + Pt) molar ratio. An analysis of the   relationship between the mechanism of HYD, analyzed here from a   different perspective as that currently presented in the   literature, and the surface properties of the bimetallic Pd–Pt   alloyed particles indicated that: (i) the development of HYD is   in correspondence with the capacity of Pd–Pt to hydrogenate   aromatics under HDS environments; (ii) the dispersion of the   active phase is not directly related to the performance in HDS.   Consequently, other geometric effects are more important to the   development of HYD over Pd–Pt; and (iii) Pdδ+  surface species of the Pd–Pt alloyed particles are responsible   for the hydrogenation–dehydrogenation steps during HYD, whereas   C–S–C bond scission mainly takes place on Pt sites.

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