Abstract
To study the local structure of the Ni promoter atom, the Ni and Mo K edge EXAFS spectra of Ni-MoS2/C hydrodesulfurization catalyst were measured in an in-situ EXAFS cell at 77 K. The Ni atom is situated in a square pyramid of five S atoms at a distance of 2.21 Å from the S atoms. In addition an EXAFS contribution due to a Mo atom at 2.82 Å from the Ni atom could be identified. This local structure indicates that the Ni atoms are situated on top of the S4 squares at the MoS2 edges in millerite-type Ni sites. The Ni atoms are situated in the planes of the Mo atoms and not in the intercalation plane midway between successive MoS2 sandwich layers.
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Bouwens, S.M.A.M., Koningsberger, D.C., De Beer, V.H.J. et al. Exafs study of the local structure of Ni in Ni-MoS2/C hydrodesulfurization catalysts. Catal Lett 5, 273–283 (1990). https://doi.org/10.1007/BF00764672
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DOI: https://doi.org/10.1007/BF00764672