Abstract
The local environment of the Ni atoms in the Ni-Mo-S phase has been elucidated by Ni K-edge EXAFS and XANES measurements of carbon-supported sulfided Ni-Mo catalysts. The results show that the Ni atoms have a low sulfur coordination number (less than six). This is contrary to recent reports in which an octahedral-like sulfur coordination have been suggested. It is proposed that the Ni atoms in Ni-Mo-S are located at the\((10\bar 10)\) edges of the MoS2 structure in square and tetragonal pyramidal type sites. These two types of sites can easily interconvert during sulfur addition/extraction and may as such be involved in the catalytic cycle.
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Niemann, W., Clausen, B.S. & Topsøe, H. X-Ray absorption studies of the Ni environment in Ni-Mo-S. Catal Lett 4, 355–363 (1990). https://doi.org/10.1007/BF00765321
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DOI: https://doi.org/10.1007/BF00765321