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Masliuk, Liudmyla ; Heggen, Marc ; Noack, Johannes ; Girgsdies, Frank ; Trunschke, Annette ; Hermann, Klaus E. ; Willinger, Marc Georg ; Schlögl, Robert ; Lunkenbein, Thomas:
Structural Complexity in Heterogeneous Catalysis : Cataloging Local Nanostructures.
In: The Journal of Physical Chemistry C.
Bd. 121
(2017)
Heft 43
.
- S. 24093-24103.
ISSN 1932-7455
DOI: https://doi.org/10.1021/acs.jpcc.7b08333
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)O-x 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)O-x particle (100 X 50 nm(2)). A detailed analysis of the atomic arrangement at the surface of this particle suggests a surface composition of (Mo610V230M70)O-x (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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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:000414724300027 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Operando-Analytik elektrochemischer Energiespeicher > Lehrstuhl Operando-Analytik elektrochemischer Energiespeicher - Univ.-Prof. Dr. Thomas Lunkenbein Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Operando-Analytik elektrochemischer Energiespeicher |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 12 Jun 2025 11:47 |
| Letzte Änderung: | 04 Jul 2025 11:32 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93718 |