Hydrodesulfurization of dibenzothiophene over CoMo/HMS and CoMo/Ti-HMS catalysts

• Published in: Catalysis communications 2006, Vol.7 (1), p.33-41
• Main Authors: Zepeda, T.A., Halachev, T., Pawelec, B., Nava, R., Klimova, T., Fuentes, G.A., Fierro, J.L.G.
• Format: Article
• Language: English
• Subjects: CoMo catalyst; HDS of DBT; HMS and Ti-HMS supports; Physical characterization; Support effect
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2005.07.021

Hexagonal mesoporous materials (HMS) with and without titanium were used as supports for preparation of CoMo HDS catalysts. The supports and the catalysts were characterized by adsorption–desorption of nitrogen, XRD, DRS UV–vis, TPR and DRIFTS in the OH region. The catalytic activity of the samples was evaluated in the reaction of hydrodesulfurization of dibenzothiophene. The activity of the CoMo/HMS and CoMo/Ti-HMS catalysts was compared to that of a conventional industrial CoMo/Al 2O 3 catalyst. The CoMo/Ti-HMS catalyst demonstrated to be more activate than Ti-free catalysts. The presence of Ti ions into the HMS framework impedes the formation of Co 2SiO 4 and of β-CoMoO 4 inactive phases. It is suggested that the higher activity of the Ti-containing catalysts is related to the better dispersion of the supported CoMo phase, the higher concentration of octahedral Co 2+ species, larger pore size diameter and lower reduction-sulfidation temperature of the supported species.