Abstract
The sulfidation of CoMo/ γ-Al 2O 3 catalysts prepared in the presence of phosphate and triethylene glycol (TEG) was studied by in situ Mo and Co K-edge QEXAFS. In a classic CoMo catalyst, prepared without phosphate and TEG, MoS 2 is formed through intermediate MoS 3-like species. In the presence of phosphate, alone or with TEG, this intermediate species is not observed and the molybdenum is directly sulfided to MoS 2. The additives increased the sulfidation degree of molybdenum with respect to the standard catalyst, leading to a better sulfur saturation of the MoS 2 slabs and to a higher static order. Co K-edged QEXAFS showed that the sulfidation rate of Co increases in the presence of phosphate and TEG.
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