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Hydrodesulfurization (HDS) activity and activation energy (e 0 TH ) values were determined and compared with irreversible sulfur uptake (S irr ) by 5 Al 2 O 3 -supported (MoO x , Ni and three NiMoO x ) catalysts and, in unsulfided form with the cyclohexane conversion activity. Synergy between Ni and Mo in catalytic activity and a correlation between HDS activity and the amounts of S irr was found. Some explanations for the differences in catalytic behavior of the different samples are presented.