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《Chinese Journal of Catalysis》 2005-08
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Characterization of CoMo/Al_2O_3 Hydrodesulfurization Catalysts Prepared by Different Methods

ZHANG Kongyuan 1,2* , LIU Aihua2, YAN Jing2, GUO Jianxue2, LIU Chenguang1(1 China University of Petroleum (East China), Dongying 257061, Shandong, China; 2 Research Institute of Qilu Branch Company, SINOPEC, Zibo 255400, Shandong, China)  
The CoMo/Al_2O_3 catalysts were prepared by impregnation (IM), dry mixing (DM) and wet mixing (WM) methods, and characterized by X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy and temperature-programmed sulfiding. The specific surface area and pore volume of CoMo/Al_2O_3(DM) and CoMo/Al_2O_3(WM) are equivalent and obviously larger than those of CoMo/Al_2O_3(IM), but the crushing strength is in the order CoMo/Al_2O_3(IM)CoMo/Al_2O_3(WM)CoMo/Al_2O_3(DM). The main binding energy of Co 2p and Mo 3d of the three catalysts is equal, and the preparation methods have no effect on the valence of Co and Mo in the catalysts. The apparent particle size of CoMo/Al_2O_3(IM) is obviously larger than that of the other two catalysts. The sulfiding of CoMo/Al_2O_3(IM) takes place both at low temperatures (55~250 ℃) and high temperatures (250~560 ℃), and there are MoS_2, Co_9S_8 and Co_4S_3 crystallines on the catalyst surface after sulfiding. The other two catalysts can be sulfided at low temperatures (54~285 ℃), and the sulfides of Co and Mo exist in amorphous phase. The distribution of Co and Mo is uniform in CoMo/Al_2O_3(WM) from the surface to the interior, and it is not so uniform in CoMo/Al_2O_3(DM). The Co and Mo concentration at the surface of CoMo/Al_2O_3(IM) is higher than that in its interior. The ammonia dissolving test results show that the dissolving ratio of MoO_3 of CoMo/Al_2O_3(DM) is basically equivalent to that of CoMo/Al_2O_3(WM), but smaller than that of CoMo/Al_2O_3(IM). The results of naphtha hydrodesulfurization show that CoMo/Al_2O_3(WM) has higher activity than the other two catalysts.
【CateGory Index】: TE624.93
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