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- W2023309765 abstract "Unpromoted and Pt, Pd, Ni and Ru-promoted molybdenum catalysts supported on amorphous silica-alumina (ASA) were characterized in the hydrodesulfurization of dibenzothiophene, and their activities were compared with a commercial PtASA catalyst. The catalytic activity was found to increase in the following order: commercial PtASA ⪢ PtMo ≈ NiMo ≈ RuMo > PdMo ≈ Mo ≈ ASA. Characterization of the catalysts by XPS, TPR, and FTIR spectroscopy of adsorbed NO and pyridine confirmed that incorporation of 16.1 wt.-% Mo, minimized to a large extent the metal-support interaction, and decreased the acidity of the catalysts; although for the Ni-catalyst, the formation of Ni aluminate (and silicate) was not prevented. The incorporation of promoters enhanced molybdenum surface exposure and decreased the reduction temperature of MoO3; and for the Ni-promoted catalyst, increased the amount of sulfidable Ni species. Pd was not very effective as a promoter due to its poor dispersion, and the presence of a low percentage of active sites in the PdMo catalyst. For binary samples, a correlation was found to exist between the dispersion of MoS2 phases, the number of active sites titrated by NO, and the HDS activity of the sulfided samples." @default.
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- W2023309765 date "1996-12-01" @default.
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- W2023309765 title "Dibenzothiophene hydrodesulfurization on silica-alumina-supported transition metal sulfide catalysts" @default.
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- W2023309765 doi "https://doi.org/10.1016/s0926-860x(96)00221-9" @default.
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