Articles written in Journal of Chemical Sciences
Volume 102 Issue 2 April 1990 pp 117-129 Inorganic and Analytical
Acidity of Ni- and Co-promoted molybdena and tungsta hydrodesulphurisation (HDS) catalysts have been determined by volumetric adsorption of ammonia. A direct correlation between the adsorption of ammonia, and hence the acidity, and the HDS activity could be observed for reduced catalysts A relation between ammonia adsorption and anion vacancy concentration is thus indicated, as the latter is related to HDS activity. Contrary to unpromoted molybdena there is a decrease in acidity on sulphidation of Ni-promoted molybdena catalyst. This decrease is attributed to the influence of, Ni in suppressing the formation of anion vacancies by catalysing the crystallisation of MoS2. Promoted tungsta catalysts were found to have lower acidities as compared to promoted molybdena catalysts, which is consistent with their lower desulphurisation activity.
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