Dibenzothiophene hydrodesulfurization on silica-alumina-supported transition metal sulfide catalysts

被引:46
作者
Navarro, R [1 ]
Pawelec, B [1 ]
Fierro, JLG [1 ]
Vasudevan, PT [1 ]
机构
[1] CSIC, INST CATALISIS & PETR QUIM, MADRID 28049, SPAIN
关键词
hydrodesulfurization; transition metal sulfides; silica-alumina-supported metal sulfides; HDS and HYD selectivities; catalyst characterization;
D O I
10.1016/S0926-860X(96)00221-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 Pt/ASA catalyst. The catalytic activity was found to increase in the following order: commercial Pt/ASA much greater than PtMo approximate to NiMo approximate to RuMo > PdMo approximate to Mo approximate to 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.
引用
收藏
页码:23 / 40
页数:18
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