Journal
CATALYSIS TODAY
Volume 130, Issue 1, Pages 170-177Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2007.06.078
Keywords
density functional theory; hydrodesulfurization; H-2 dissociation; C-S bond breaking; sulfide catalysis; nickel-molybdenum sulfides
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The hydrodesulfurization of dibenzothiophene on a NiMoS cluster consisting of 1 Ni and 18 Mo atoms was investigated by means of density functional theory. The calculations focus on the direct desulfurization pathway where dibenzothiophene reacts with H-2 to biphenyl and H2S. Critical steps with high activation energies are breaking of the two C-S bonds of the DBT molecule (ca. 32 kcal/mol), the activation of H-2 by heterolytic dissociation and the removal of the formed biphenyl molecule from the catalyst surface (17 kcal/mol, respectively). All other reaction steps have activation energies of <= 10 kcal/mol. (C) 2007 Elsevier B.V. All rights reserved.
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