Victor Baldovino-Medrano - The functionalities of Pt–Mo catalysts in hydrotreatment reactions

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  Fuel Volume 89, Issue 5, May 2010, Pages 1012–1018


    The catalytic functionalities of bimetallic   Pt–Mo/γ-Al2O3    catalysts in hydrotreatment were studied by performing   simultaneous and independent dibenzothiophene (DBT)   hydrodesulfurization (HDS) and naphthalene hydrodearomatization   (HDA) reactions as a function of the activating agent and the   MoO3content.   Pt–Mo/γ-Al2O3    catalysts always displayed a higher selectivity to both the   direct route of desulfurization (DDS) of DBT and to HDS over HDA   than the one exhibited by conventional CoMo and   NiMo/γ-Al2O3.   It was established that for the Pt–Mo catalytic system, the   selectivity DDS to the hydrogenation route of desulfurization of   DBT can be indirectly described by the selectivity HDS/HDA in   simultaneous HDS–HDA catalytic tests. The model of an active   phase composed of separated metallic Pt particles,   PtSxspecies,   and sulfided Mo which can either act as independent or   cooperative active centers seems to be suitable to explain both   the observed kinetic trends and the synergy effect between Pt and   Mo.

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