Abstract
A CoMo hydrotreating catalyst was presulfided ex situ by impregnation of the ditertio-nonylpentasulfide (TNPS) and subsequent hydrogen treatment up to 623 K at various pressures (1–21 bar). The genesis of the sulfide phase at each step of the activation procedure, impregnation, drying, hydrogen treatment was studied using several physicochemical techniques, UV–Vis Reflectance spectroscopy, XPS and HREM. By comparison with the conventional sulfiding procedure (H 2–H 2S), this ex situ sulfidation process brings about a significant increase in the dispersion of the active molybdenum sulfide phase. In agreement with these results, the hydrodesulfurization activity in the thiophene conversion is also increased.
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