Promotion of highly loaded MoS2/Al2O3 hydrodesulfurization catalysts prepared in aqueous solution

I. Bezverkhyy , P. Afanasiev (1) , M. Lacroix (1)

1 IRC - Institut de recherches sur la catalyse

A procedure for the prepn. and promotion of highly loaded MoS2/Al2O3 catalysts (21 wt% Mo) obtained in aq. soln. by the redn. of (NH4)2MoS4 with N2H4 in the presence of Al2O3 was studied. Treating the freshly prepd. material with acetone results in the formation of carbon species (ca. 1 wt% C) that make it possible to maintain a high dispersion of the MoS2 particles. Several Co-promoted MoS2/Al2O3 catalysts were prepd. with different methods and Co precursors. Refluxing with Co(acac)2.2H2O dissolved in org. solvent proved to be the most efficient method for promoting highly loaded carbon-stabilized MoS2/Al2O3. The catalysts obtained can be used directly in the thiophene hydrodesulfurization reaction without any addnl. sulfidation, and they exhibit a much higher activity than a com. ref. catalyst. An EXAFS study revealed that the acetylacetonate precursor is decompd. during the refluxing treatment and gives new species in which Co is surrounded by sulfur instead of oxygen. The formation of a highly dispersed CoMoS phase was obsd. after further thiophene hydrodesulfurization reaction.

Domaines: Catalyse

I. Bezverkhyy, P. Afanasiev, M. Lacroix. Promotion of highly loaded MoS2/Al2O3 hydrodesulfurization catalysts prepared in aqueous solution. Journal of Catalysis, 2005, 230 (1), pp.133-139. ⟨hal-00012538⟩