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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Spojakina, A., Palcheva, R., Jiratova, K. et al. Synergism Between Ni and W in the Niw/ γ-Al2O3 Hydrotreating Catalysts. Catal Lett 104, 45–52 (2005). https://doi.org/10.1007/s10562-005-7434-1
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DOI: https://doi.org/10.1007/s10562-005-7434-1