Hydrodesulfurization catalysts: Promoters, promoting methods and support effect on catalytic activities

CoMoS phases supported on gamma-Al2O3, TiO2 and SiO2 were prepared using various synthesis methods and Co(NO3)(2)center dot 6H(2)O or Co(acac)(2)center dot nH(2)O as precursors of the promoting agent. The catalysts obtained were tested in the thiophene hydrodesulfurization (HDS) reaction at atmospheric pressure. These experiments showed that the catalysts prepared by the impregnation of supported MoS2 with cobalt precursors exhibit better HDS properties than the catalysts prepared by successive impregnation of Mo and Co salts followed by a sulfidation step. Furthermore, with gamma-Al2O3 and SiO2, the use of Co(acac)(2)center dot nH(2)O, without any further calcination after the impregnation, allowed even better catalytic activities. With TiO2, the promoting effect is identical whatever the Co precursor used. To cite this article: C Roukoss et al., C R. Chimie 12 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.