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Citation: Fu Xian-Zhi, Huang Hui-Zhong, Zhu Lin, Luo Sheng-Cheng, Gui Lin-Lin. Investigation of Sulfidation Processes for Hydrotreating Catalysts by[J]. Acta Physico-Chimica Sinica, ;1995, 11(12): 1071-1076. doi: 10.3866/PKU.WHXB19951203 shu

Investigation of Sulfidation Processes for Hydrotreating Catalysts by

1.
Institute of Physical Chemistry, Peking University, Beijing 100871

Received Date: 5 January 1995
Available Online: 15 December 1995

The suffidation process of Mo/Al_2O_3, Mo/TiO_2-Al_2O_3, Co/Al_2O_3 t Co/TiO_2Al_2O_3, Co-Mo/Al_2O_3 and Co-Mo/TiO_2-Al_2O_3 samples were studied by using "in - situ" XPS techniques. The results show that for alumina-supported catalysts with lower Mo orCo loading (less than 0.05 g MoO_3/gAl_2O_3 or 0.03 g CoO/gAl_2O_3 respectively) the Mo andCo sulfides can not be formed. While the catalysts supported on the TiO_2-modified aluAnna, the sulfidatrion of Mo/TiO_2-Al_2O_3 catalysts is much easier than that of Mo/Al_2O_3catalysts. The highly dispersed cobolt oxidic species are very difficult to the Co/Al_2O_3 catalysts be sulfided even at 400 ℃, while the sulfidation of Co_3O_4crystallite is much easier. The TiO_2-modified alumina doed not affect the sulfidation of the Co/Al_2O_3 catalysts in the form of higher dispersion, but has a significant influence on the sulfidation of Co_3O_4 crystallite. The activity measurements of thiophene hydrodesulfurization (HDS) indicate that a od correlation exists between the degree of sulfidation and HDS activity for both Co-Mo/Al_2O_3 and Co-Mo/TiO_2-Al_2O_3 catalysts. The HDS activity and sulfidation degree of Co-Mo catalysts can be increased remarkly as using the TiO_2-modified alumina carrier.
- "in-situ" XPS
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