In order to get deeper insights into Co-MoS
2 hydrodesulfurization (HDS) catalysts, we tried to prepare surface designed Co-Mo HDS catalysts, in which the active sites, CoMoS, are selectively and fully formed, by means of a CVD technique using Co(CO)
3NO as a precursor to Co sulfide. The CVD catalysts were characterized by XPS, XAFS, NO adsorption, and magnetic measurements. Thus CVD-Co/MoS
2 catalysts allow us to study the structure of CoMoS, the reaction mechanism of HDS, and the effects of additives and sulfidation conditions on HDS activity in terms of TOF. The structure of CoMoS is described as dinuclear Co sulfide clusters located on the edge of MoS
2 particles. The electronic state of CoMoS and its TOF are determined by the interaction between MoS
2 particles and the support.
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