Résumé
MoS2 catalysts were prepared on Al2O3, SiO2 and TiO2 support. On the oxidicforms, Raman and UV-visible characterizations show the strong Mo-TiO2 interaction and theweak Mo-SiO2 one that leads to a poorer Mo dispersion s. MoS2 nanoparticles were thenstudied by TEM and adsorption of CO followed by infra-red spectroscopy which allows thedistinction and quantification of the two stable edges namely the S- and M- edges. It appearsthat the slab morphology is strongly modified by the support nature: thus the stronger theMoS2-support interaction the higher the S-/M- edge ratio. Finally, MoS2 morphology impactsthe catalytic activity in thiophene HDS: (1) an increase of the S-/M- edge ratio leads to theincrease of the TOF value for Mo sulfided supported on Al2O3 and SiO2; (2) a specific behaviorwith high TOF value of mainly M-edge sites and strong hydrogenating properties is underlinedfor Mo/TiO2.