The morphology of MoS2, WS2, Co–Mo–S, Ni–Mo–S and Ni–W–S nanoclusters in hydrodesulfurization catalysts revealed by HAADF-STEM |
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Authors: | M Brorson A Carlsson H Topse |
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Affiliation: | aHaldor Topsoe, Nymøllevej 55, DK-2800 Kgs., Lyngby, Denmark |
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Abstract: | 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 S-type edges at the expense of unpromoted 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 truncations. |
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Keywords: | Nanocluster Hydrodesulfurization Co-Mo-S Ni-Mo-S Ni-W-S HAADF-STEM |
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