Abstract
A novel Mo/TiO2 catalyst with the MoO3 loading of 7.2% (mass fraction) used for hydrodesulfurization (HDS) of thiophene was prepared by the impregnation method, in which mesoporous titania whisker (TiO2) molding material was used as the support and ammonium heptamolybdate [(NH4)6Mo7O24 ·4H2O] solution as the impregnation solution. The catalyst was well characterized by some techniques, such as X-ray diffraction (XRD), N2 adsorption-desorption, and its HDS activity for thiophene was evaluated in a continuous-flow fixed-bed micro-reactor under different reaction conditions. Furthermore, the stability of novel Mo/TiO2 catalyst in HDS reaction of thiophene was also investigated. The results indicated that the novel catalyst was in anatase phase. The specific surface areas of TiO2 whisker and novel Mo/TiO2 catalyst were 93 m2/g and 72 m2/g, their pore volumes were 0.27 cm3/g and 0.23 cm3/g, respectively, and there was no obvious reduction in specific surface area and pore volume between them. When the Mo/TiO2 catalyst was used to catalyze the HDS of thiophene, its activity could reach higher level in 5 h, and the mass fraction of thiophene in model solution could be reduced from 1300 μg/g to 5 μg/g. The thiophene conversion of HDS over the Mo/TiO2 catalyst could reach near 100% under reaction temperature of 300-330°C, H2 pressure of 1.5-3.0 MPa, H2/oil volume ratio of 155-250 and LHSV of 3.0-5.0 h-1, and no obvious evidence of deactivation for the catalyst could be seen after running for 500 h.
Original language | English |
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Pages (from-to) | 76-81 |
Number of pages | 6 |
Journal | Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) |
Volume | 23 |
Issue number | 4 |
State | Published - Aug 2007 |
Keywords
- Catalyst
- Hydrodesulfurization
- Mesoporous TiO
- Molybdenum
- Thiophene
- Titania whisker