Abstract
Sulfided NiW and CoW catalysts supported on activated carbon and alumina were characterized with 57Co Mossbauer emission spectroscopy (MES) and EXAFS at the W-LIII edge. NiW catalysts were studied with MES by probing the Ni atoms with 57Co. MES results demonstrate that the ‘Ni-W-S’ phase is present in sulfided NiW catalysts. Formation of Co9S8-type phases could be related to the lower thiophene HDS activity of CoW catalysts. W EXAFS showed that addition of Co or Ni to a W/Al2O3 catalyst results in a higher W sulfidation degree. No structural differences were found for carbon- and alumina-supported catalysts, in spite of the two times larger thiophene HDS activity of carbon-supported NiW.
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