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《Chinese Journal of Catalysis》 2005-07
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Mo-Co Catalyst Supported on Multiwalled Carbon Nanotubes for Hydrodesulfurization of Thiophene

DONG Kunming, WU Xiaoman, LIN Guodong, ZHANG Hongbin*(Institute of Chemistry and Chemical Engineering, State Key Laboratory for Physical Chemistryof Solid Surfaces, Xiamen University, Xiamen 361005, Fujian, China)  
Using home-made multiwalled carbon nanotubes (CNT) as support, Mo-Co/CNT was prepared by an incipient wetness technique. The catalytic performance of the catalyst for hydrodesulfurization (HDS) of thiophene was studied and compared with the reference systems of Mo-Co/γ-Al_2O_3 and Mo-Co/AC. Under the reaction conditions of n(C_4H_4S) / n(H_2) =2.3/97.7, GHSV= 2?200 ml/(g·h), p=0.1 MPa and T=623 K, the specific reaction rate of thiophene HDS over 7.2%(Mo-Co)/CNT catalyst reached 0.64·10 -3 s -1 , which was 1.68 and 2.28 times as high as that over 9.7%(Mo-Co)/γ-Al_2O_3 and 16.9%(Mo-Co)/AC, respectively. Using the CNT in place of γ-Al_2O_3 or AC as the catalyst support caused little change in the apparent activation energy for thiophene HDS reaction, but led to a significant increase in concentration of active Mo species (Mo 4+ ) on the surface of the functioning catalyst. In addition, the catalyst Mo-Co/CNT could reversibly adsorb a greater amount of hydrogen under atmospheric pressure at temperatures from room temperature to 673 K. This unique feature would help to generate microenvironments with higher stationary-state concentration of active hydrogen-adspecies on the surface of the functioning catalyst. Both factors mentioned above were favorable to increase the rate of the thiophene HDS reaction.
【Fund】: 教育部博士点科研基金(20010384002);; 福建省自然科学基金(2001H017)资助项目.
【CateGory Index】: TE624.93
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