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  Structural Complexity in Heterogeneous Catalysis: Cataloging Local Nanostructures

Masliuk, L., Heggen, M., Noack, J., Girgsdies, F., Trunschke, A., Hermann, K., et al. (2017). Structural Complexity in Heterogeneous Catalysis: Cataloging Local Nanostructures. The Journal of Physical Chemistry C, 121(43), 24093-24103. doi:10.1021/acs.jpcc.7b08333.

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 Creators:
Masliuk, Liudmyla1, Author           
Heggen, Marc2, Author
Noack, Johannes1, 3, Author           
Girgsdies, Frank1, Author           
Trunschke, Annette1, Author           
Hermann, Klaus1, Author           
Willinger, Marc Georg1, 4, Author           
Schlögl, Robert1, 5, Author           
Lunkenbein, Thomas1, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Ernst-Ruska Centre, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52425 Jülich, Germany, ou_persistent22              
3BasCat UniCat BASF JointLab, Technical University of Berlin, Hardenbergstraße 36, 10623 Berlin, Germany, ou_persistent22              
4Max Planck Institute of Colloid and Interfaces, Am Mühlenberg 1, 14476 Golm, Germany, ou_persistent22              
5Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              

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 Abstract: We present an analytical route toward a detailed and quantitative description of individual defects in heterogeneous catalysts. The investigation is based on a high resolution scanning transmission electron microscopy (STEM) study using complex (Mo,V)Ox mixed oxide as an example. Tiling the structural regions simplifies the identification of local modifications in the microstructure. Up to 19 different structures were observed that can be listed and classified into different structural motifs, intergrowth, channels, interstitial regions, and inclinations. The observed defects are expressed by the rearrangement of the {(Mo)Mo5O27} building blocks, exhibit different sizes, penetrate the bulk, and can form decoupled surface regions that partially cover the crystallographic bulk. The evaluation of 31 crystals yields an average defect concentration of 3.3% and indicates the absence of identical particles. We have, for example, observed 54 of these rearranged structures close to the surface of one (Mo,V)Ox particle (100 × 50 nm2). A detailed analysis of the atomic arrangement at the surface of this particle suggests a surface composition of (Mo610V230M70)Ox (M = Mo and/or V). The resulting catalog of motifs reproduces individual fragments of the real structure of a catalyst and can reveal detailed defect−activity correlations that will contribute to a better understanding of heterogeneous catalysis.

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Language(s): eng - English
 Dates: 2017-10-062017-08-212017-10-102017-11-02
 Publication Status: Issued
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.7b08333
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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: 11 Volume / Issue: 121 (43) Sequence Number: - Start / End Page: 24093 - 24103 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766