Journal
CATALYSIS TODAY
Volume 261, Issue -, Pages 75-81Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2015.08.053
Keywords
Heterogeneous catalysis; Hydrodesulfurization; Molybdenum disulfide; Scanning transmission electron microscopy; Electron energy loss spectroscopy
Funding
- EPSRC (UK)
- Danish Council for Strategic Research (grant Cat-C)
- Danish Council for Independent Research (grant HYDECAT) [DFF-1335-00016]
- Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub through the Office of Science of the US Department of Energy [DE-SC0004993]
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The location of Co and Ni promoter atoms in industrial-style hydrotreating catalysts is examined by combining aberration-corrected scanning transmission electron microscopy and electron energy loss spectrum imaging. The observations unambiguously demonstrate that both Co and Ni promoter atoms occupy sites at all low-indexed edge terminations of hexagonally shaped multi-layer MoS2 nanocrystals. In contrast, similar observations for single-layer MoS2 nanocrystals show that Co-promoter atoms preferentially attach at the (-1 0 0) S-edge termination and are absent at the (1 0 0) Mo-edge termination. The apparent discrepancy between single- and multi-layer MoS2 nanocrystals can be explained by the 2H-MoS2 crystal structure, for which successive MoS2 layers alternatingly expose Mo- and S-edge terminations in any of the low-indexed directions. Thus, the multi-layer Co-Mo-S and Ni-Mo-S nanocrystals, formed in the present type of industrial-style hydrotreating catalyst, are consistently described as a superposition of single-layer Co-Mo-S and Ni-Mo-S structures, and in turn, provide promoted edge sites with different steric accessibility for the organic compounds in mineral oil distillates. (C) 2015 Elsevier B.V. All rights reserved.
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