Abstract
The catalytic performances of conventional Ni(Co)Mo(W)/Al2O3 catalysts for hydrodesulfurization (HDS) of fuel are far from meeting the near zero emission standards. Therefore, the development of more efficient ultradeep HDS catalyst is highly desirable. Herein, a novel Pt-Ni2P/Al2O3 catalyst with 0.5 wt% Pt loading was prepared, and its catalytic performance for HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) was investigated. The introduction of Pt considerably promoted the reducibility and hydrogen atoms produced by the dissociated adsorbed hydrogen molecules on the Pt surface overflowing to the Ni2P because of the lower electronegativity of Pt than that of Ni, thereby increasing the number of stronger Lewis and Brønsted acid sites, and thereafter greatly boosting the direct desulfurization and isomerization pathways. As a result, Pt-Ni2P/Al2O3 catalyst achieved the ultradeep HDS of 4,6-DMDBT, with 100% conversion at 340 °C, remarkably higher than that of Ni2P/Al2O3 (49.8%) and NiMo/Al2O3 (62.0%) counterparts.
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