期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 40, 页码 10723-10727出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201405690
关键词
chalcogens; electron microscopy; heterogeneous catalysis; molybdenum disulfide; single-atom imaging
资金
- EPSRC (UK)
- Danish Council for Strategic Research
- Danish Council for Independent Research [DFF-1335-00016]
- Office of Science of the US Department of Energy [DE-SC0004993]
The functional properties of transition metal dichalcogenides (TMDs) may be promoted by the inclusion of other elements. Here, we studied the local stoichiometry of single cobalt promoter atoms in an industrial-style MoS2-based hydrotreating catalyst. Aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy show that the Co atoms occupy sites at the (-100) S edge terminations of the graphite-supported MoS2 nanocrystals in the catalyst. Specifically, each Co atom has four neighboring S atoms that are arranged in a reconstructed geometry, which reflects an equilibrium state. The structure agrees with complementary studies of catalysts that were prepared under vastly different conditions and on other supports. In contrast, a small amount of residual Fe in the graphite is found to compete for the S edge sites, so that promotion by Co is strongly sensitive to the purity of the raw materials. The present single-atom-sensitive analytical method therefore offers a guide for advancing preparative methods for promoted TMD nanomaterials.
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