The TPR Study of Carbon Nanotube Supported Co-Mo HDS Catalyst

Shang Hongyan, Chai Yongming, Xu Yongqiang, Liu Chenguang
(Department of Applied Chemistry, Key Laboratory of Catalysis, CNPC, University of Petroleum, Dongying, 257061)

Abstract In this paper, XRD technique was used to characterize the species and dispersion of active phases, which may exist on the surface of carbon nanotube and alumina supported Co-Mo catalytic system, respectively. It was found that the main species existed on the surface of Co-Mo/CNT were MoO₂, CoMoO₃ and Co₂Mo₃O₈, whereas it was not the case with Co-Mo/g-Al₂O₃.The TPR (temperature programmed reduction) results showed that the active phases existed on Co-Mo/CNT were more easily reduced at lower temperature than those on the surface of Co-Mo/g-Al₂O₃, indicating that there was weak interactions between the active species and the carbon nanotube, whereas a strong interaction may exist between active phases and the alumina support, resulting in some species which were hard to be reduced.
Key words Carbon nanotube, XRD, TPR, HDS