Abstract
The chemical activity of Mo(100) single crystals partially covered with sulfur towards the adsorption of O 2 and C 4H 4S is studied as a function of S coverage. The chemosorption of oxygen appears to be complementary to that of sulfur. The C 4H 4S molecules undergo irreversible decomposition when adsorbed on the clean surface, whereas the partially sulfided surface (at θ s ≳0.5) adsorbs the C 4H 4S undissociated. The binding energy of C 4H 4S on the sulfided surface is higher though than on the MoS 2 basal planes. These results may have some significance in relation with the HDS activity of MoS 2 catalysts which is thought to occur on the edge sites of that compound.
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