Mo-co catalyst supported on multiwalled carbon nanotubes for hydrodesulfurization of thiophene
- 化学化工－已发表论文 
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/gamma-Al2O3 and Mo-Co/AC. Under the reaction conditions of n (C4H4S) In (H-2) = 2.3 /97.7, GHSV = 2 200 ml/(g center dot 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 center dot 10(-3) s (-1), which was 1. 68 and 2. 28 times as high as that over 9. 7 % (Mo-Co) /gamma-Al2O3 and 16. 9 % (Mo-Co) /AC, respectively. Using the CNT in place of gamma-Al2O3 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 (Mo4+) 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.