A study of Co/Mo/Al2O3 hydrodesulphurization catalysts and related model compounds byxps and x-ray absorption spectroscopy (xanes andexafs ) |
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| Authors: | G Sankar P R Sarode A Srinivasan C N R Rao S Vasudevan and J M Thomas |
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| Institution: | (1) Solid State and Structural Chemistry Unit, Indian Institute of Science, 560012 Bangalore, India;(2) Department of Physical Chemistry, University of Cambridge, Lensfield Road, CB2 1EP Cambridge, UK |
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| Abstract: | A detailed investigation of sulphided Co/Mo/Al2O3 catalysts, their oxide precursors and several model oxides and sulphides of cobalt and molybdenum has been carried out using
x-ray photoelectron spectroscopy and x-ray absorption spectroscopy (xanes andexafs). Octahedrally coordinated Co(II) and Mo(IV) are shown to be present in a sulphidic environment on the surfaces of these
catalysts. The surface species contain an excess of sulphur, probably involving disulphide linkages. The surface compositions
of the catalysts examined conform to the general formula Co11 Mo
2n
IV
(2n + 3)S
2
2−
(2n -2)S2−. |
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| Keywords: | Hydrodesulphurization cobalt-molybdenum catalysts exafs" target="_blank">exafs xanes" target="_blank">xanes |
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