Catalytic Performance of Noble Metals Supported on Alumina-modified Silica Gel for Hydrodesulfurization Reaction
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The catalytic activities and properties of noble metals (Pt, Pd, Rh, Ru) supported on silica gel (SiO_2) and alumina-modified silica gel (Al_2O_3-SiO_2) were investigated for the hydrodesulfurization of thiophene. Al_2O_3-SiO_2 was prepared by an impregnation method using aluminum nitrate (Al(NO_3)_3·9H_2O) aqueous solution. Pt/8 wt%Al_2O_3-SiO_2 catalyst showed the highest activity for hydrodesulfurization of thiophene among various supported noble metal catalysts and this activity was higher than that of commercial CoMo/Al_2O_3 hydrodesulfurization catalyst. The sulfur tolerance of noble metal/SiO_2 was enhanced by Al_2O_3 modification of SiO_2 and Pt/8 wt%Al_2O_3-SiO_2 catalyst showed the highest sulfur tolerance among the supported noble metal catalysts. Pt/8 wt%Al_2O_3-SiO_2 catalyst had high hydrogenating ability for unsaturated C_4 hydrocarbons formed in the hydrodesulfurization of thiophene. The catalysts were characterized by 2-propanol dehydration, cumene cracking, XRD, H_2 adsorption and FT-IR. Dispersion of Pt on 8 wt%Al_2O_3-SiO_2 was remarkably higher than that on SiO_2 and the particle size of Pt on 8 wt%Al_2O_3-SiO_2 was the lowest among the supported noble metal catalysts. The acidity of 8 wt%Al_2O_3-SiO_2 was higher than that of SiO_2. Furthermore, Brönsted acid sites were present on 8 wt%Al_2O_3-SiO_2. FT-IR spectroscopy of thiophene adsorbed on 8 wt%Al_2O_3-SiO_2 support indicated that the thiophene molecule interacts with the Brönsted acid site on 8 wt%Al_2O_3-SiO_2. The activity of the double-layer (Pt/SiO_2 + 8 wt%Al_2O_3-SiO_2) catalyst obtained experimentally was higher than that calculated. This suggests that spillover hydrogen was present on Pt/Al_2O_3-SiO_2 in the hydrodesulfurization of thiophene. Both the Brönsted acid sites of Al_2O_3-SiO_2 and the Pt particles in the Pt/Al_2O_3-SiO_2 catalyst act as active sites for the hydrodesulfurization of thiophene.
- 石油学会の論文
- 2006-05-01
石油学会 | 論文
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