Abstract
Publisher Summary This chapter discusses the characterization and catalytic activities of MCM-41 supported WS 2 hydrotreating catalysts. WO 3 -MCM-41 catalysts are prepared with good dispersion of WO 3 . The oxygen chemisorption in the sulfided state indicate that WS 2 is also well dispersed on MCM-41 surface. Oxygen (O 2 ) chemisorption as a function of W loading indicate that maximum dispersion and maximum number of anion vacancies are obtained with 19wt% W with highest catalytic activities for hydrodesulfurization, hydrogenation, and hydrooxydation. The small crystallite size and its constancy as function of W loading coupled with low-surface coverage by WS 2 indicate that monolayer WS 2 patches are formed on the selected regions of support surface. The correlation between O 2 uptake and catalytic activity indicate that oxygen chemisorption is not specific to any of the functionalities of the overall dispersion of WS 2 . Cobalt (Co) and nickel (Ni) addition result in promotional effect for both HYD and HDS, and the three catalytic functionalities originate from different set of sites on the WS 2 and its promoted analogs.
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