Zhu, Y, Ramasse, QM orcid.org/0000-0001-7466-2283, Brorson, M et al. (4 more authors) (2014) Visualizing the Stoichiometry of Industrial-Style Co-Mo-S Catalysts with Single-Atom Sensitivity. Angewandte Chemie International Edition, 53 (40). pp. 10723-10727. ISSN 1433-7851
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Zhu, Y, Ramasse, QM , Brorson, M et al. (2014) Visualizing the Stoichiometry of Industrial-Style Co-Mo-S Catalysts with Single-Atom Sensitivity. Angewandte Chemie International Edition, 53 (40). pp. 10723-10727. ISSN 1433-7851, which has been published in final form at https://doi.org/10.1002/anie.201405690. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Keywords: | chalcogens; electron microscopy; heterogeneous catalysis; molybdenum disulfide; single‐atom imaging |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Oct 2020 10:57 |
Last Modified: | 05 Oct 2020 10:57 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/anie.201405690 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:166342 |