The morphology of MoS2, WS2, Co–Mo–S, Ni–Mo–S and Ni–W–S nanoclusters in hydrodesulfurization catalysts revealed by HAADF-STEM

HAADF-STEM studies have provided detailed morphological insight regarding MoS2, WS2, Co–Mo–S, Ni–Mo–S and Ni–W–S nanostructures in graphite-supported catalysts. It is found that the technique allows the catalytically active edges to be imaged even for single layer metal sulfide structures. Unpromote...

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Bibliographic Details
Published in:Catalysis today 2007-05, Vol.123 (1-4), p.31-36
Main Authors: Brorson, M., Carlsson, A., Topsøe, H.
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Co-Mo-S
Exact sciences and technology
General and physical chemistry
HAADF-STEM
Hydrodesulfurization
Nanocluster
Ni-Mo-S
Ni-W-S
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:HAADF-STEM studies have provided detailed morphological insight regarding MoS2, WS2, Co–Mo–S, Ni–Mo–S and Ni–W–S nanostructures in graphite-supported catalysts. It is found that the technique allows the catalytically active edges to be imaged even for single layer metal sulfide structures. Unpromoted MoS2 and WS2 are predominantly present as slightly truncated triangular clusters containing only a single S–M–S layer (M=Mo, W). The addition of promoter atoms results in more heavy truncations consistent with the expected tendency for the Co–Mo–S structures to expose promoted (1¯ 0 1 0) S-type edges at the expense of unpromoted (1 0 1¯ 0) Mo-type edges. However, the HAADF-STEM (High-Angle Annular Dark-field Scanning Transmission Electron Microscopy) results show for the first time that Co–Mo–S and Ni–W–S may also expose extended high index (1 1 2¯ 0) truncations.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2007.01.073