Synergism Between Ni and W in the Niw/ γ-Al2O3 Hydrotreating Catalysts |
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Authors: | A Spojakina R Palcheva K Jiratova G Tyuliev L Petrov |
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Affiliation: | (1) Institute of Catalysis, Bulgarian Academy of Sciences, G.Bonchev str. bl. 11, 1113 Sofia, Bulgaria;(2) Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague 6, Czech Republic |
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Abstract: | A series of NiW/ γ-Al2O3 catalysts (20 and 30 wt% W and 1–5 wt% Ni) have been prepared and studied by TPR and XPS. HDS activity has been tested in
the thiophene conversion. The effect of Ni and W loadings on the formation of different structures is presented. In the calcined
catalysts several phases coexist, concentrations of which depend on the Ni/(Ni+W) atomic ratio. The Ni synergistic effect
in the HDS reaction is confirmed by the increase in the HDS activity (~10–15 times). This effect is ascribed to the formation
of an active NiWS phase of high dispersion from the mixed NiW oxide precursors. At higher Ni/Ni+W ratio a redistribution of
active components in additional amount ofNiWS phase during sulfidation is suggested. |
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Keywords: | NiW/ γ -Al2O3 Thiophene hydrodesulfurization TPR XPS |
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