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《Chinese Journal of Catalysis》 2004-05
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Activated Carbon-Supported Co-Mo Catalyst for HydrodesulfurizationⅠ. Comparison of Activated Carbon and Alumina Supports

SHANG Hongyan*, LIU Chenguang, XU Yongqiang, ZHAO Ruiyu(State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis of CNPC, University of Petroleum, Dongying 257061, Shandong, China)  
The XRD, TPR and XPS techniques were used to characterize the Co-Mo/AC (activated carbon) and Co-Mo/γ-Al 2O 3 catalysts prepared by impregnation. The activity and selectivity of the catalysts for HDS of dibenzothiophene were evaluated. All the active phases were well dispersed on the surface of AC support irrespective of treatment temperature and Co/Mo ratio. The active species on AC support were reduced at lower temperatures than those on γ-Al 2O 3 support. Only Mo(Ⅵ) species existed on the surface of oxidized Co-Mo/γ-Al 2O 3 catalyst, whereas, Mo(Ⅴ) and Mo(Ⅵ) species co-existed on the surface of oxidized Co-Mo/AC catalyst. As for the sulfided Co-Mo catalyst, low valence state Mo(Ⅳ) species in the form of MoS 2 along with partially reduced Mo(Ⅴ) species in the form of MoO 3S 2- and/or MoO 2S 2- were detected on the surface of CoMoS/AC catalyst. By comparison, low valence Mo(Ⅳ) was absent on the surface of sulfided CoMoS/γ-Al 2O 3. Similarly, the Mo(Ⅴ) species in the form of MoO 3S 2- and/or MoO 2S 2- were detected, but there still was a fraction of unreduced high valence state Mo(Ⅳ) on the surface of sulfided CoMoS/γ-Al 2O 3. The Mo(Ⅳ) species in the form of MoS 2 were more easily formed on the surface of Co-Mo/AC than on Co-Mo/γ-Al 2O 3. Co-Mo/AC ( n(Co)/ n(Mo)=0 7) possessed higher activity than Co-Mo/γ-Al 2O 3 whereas the Co-Mo/AC samples with other Co/Mo ratios were less active than Co-Mo/γ-Al 2O 3.
【Fund】: 中国石油天然气集团公司基金资助项目 (0 3A5 0 5 0 10 1)
【CateGory Index】: TE621
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