Characterization of supported catalysts with surface spectroscopic techniques is often limited due to restraints imposed by the support material. The use of flat conducting substrates as a model support offers a way to apply these techniques to their full potential. Such surface science models of silica and alumina supported CoMoS catalysts have been made by impregnating thin SiO2 and Al2O3 films with a solution of nitrilotriacetic acid (NTA) complexes of cobalt and molybdenum. X-ray Photoelectron Spectroscopy (XPS) spectra indicate that the order in which cabalt and molybdenum transfer to the sulfided state is reversed with respect to oxidic Co and Mo systems prepared by conventional methods, implying that NTA complexation retards the sulfidation of cobalt to temperatures where MoS2 is already formed. Catalytic tests show that the CoMoS model catalysts exhibit activities for thiophene desulfurisation and product distributions similar to those of their high surface area counterparts.
|Naam||Studies in Surface Science and Catalysis|
|ISSN van geprinte versie||0167-2991|
|Congres||conference; International Symposium on Hydrotreatment and Hydrocracking of Oil Fractions ; 1 (Oostende) : 1997.02.17-19|
|Periode||1/01/97 → …|
|Ander||International Symposium on Hydrotreatment and Hydrocracking of Oil Fractions ; 1 (Oostende) : 1997.02.17-19|