In-situ investigation of the surface sites on Co-Mo/Al_2O_3 and Ni-Mo/Al_2O_3 catalysts by means of high temperature and pressure DRIFT method

摘要

Surface sites on Co-Mo/Al_2O_3 and Ni-Mo/Al_2O_3 sulfided at high pressure was investigated by high pressure DRIFT method. DRIFT measurements of adsorbed NO indicated that high pressure (≥1.1Mpa) sulfiding induces selective Co site formation of Co-Mo/Al_2O_3 and Ni site formation on Ni-Mo/Al_2O_3, respectively. EXAFS measurements also indicated that surface structural change induced by high pressure sulfiding is not accompanied by the change of the morphology of MoS_2-like structure on both Co-Mo/Al_2O_3 and Ni- Mo/Al_2O_3.