New trends in the concept of catalytic sites over sulfide catalysts

The ratio of selectivities between the hydrogenation (HYD) and the direct desulfurization (DDS) routes are found to be the same whatever the inhibiting compound and the aging has the same effect on both routes of reaction. These results will be discussed assuming adsorptions on the same type of sites (uncoordinated molybdenum atom) and a general mechanism will be proposed.