title: Effect of catalyst preparation conditions on the hydrodesulfurization of thiophene over Co-Mo/gamma-Al2O3.
abstract: The purpose of this research was to study the effects of preparation conditions on the catalytic properties of the Co-Mo/gamma-Al2O3 catalyst. The work included catalyst preparations and reactions. In the preparations, cobalt-impregnated Mo/gamma-Al2O3 (designated as IcIM) was found to have a promoting effect on the hydrodesulfurization (HDS) of thiophene. Activity and stability of IcIM was higher than that of Mo/gamma-Al2O3. Conversely, when cobalt was added onto Mo/gamma-Al2O3 by the mechanical mixing method, no promoting effect was observed. Mo/gamma-Al2O3 was also prepared using the two different methods (incipient impregnation or mechanical mixing). The differently prepared Mo/gamma-Al203 resulted in no obvious difference in activity of IcIM. It was further found that Co-Mo/gamma-Al2O3 activity initially increased appreciably with Mo content and leveled off at Mo contents above 9 wt.%. The catalyst exhibited a maximum activity at Co/Mo ratio 0.3. The order in which metal species were added had a great influence on the activity of the Co-Mo/gamma-Al2O3 catalyst. Higher activity was obtained when Co was added into Mo/gamma-Al2O3 as opposed to Mo added into Co/gamma-Al2O3.
authors.affiliation: Department of Chemical Engineering, Southern Taiwan University of Technology, Tainan, ROC.
authors.forename: Chun-Liang
authors.initials: CL
authors.lastname: Chen
authors.forename: Shiow-Shyung
authors.initials: SS
authors.lastname: Lin
authors.forename: Tuan-Chi
authors.initials: TC
authors.lastname: Liu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D006868:Hydrolysis; D008982:Molybdenum / Q000737:chemistry; D012037:Refuse Disposal; D013455:Sulfur / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry*
chemical_list: D013876:Thiophenes; D003035:Cobalt; D013455:Sulfur; D008982:Molybdenum; D000537:Aluminum Oxide