at Google ScholarTitle data
Plodinec, Milivoj ; Nerl, Hannah C. ; Girgsdies, Frank ; Schlögl, Robert ; Lunkenbein, Thomas:
Insights into Chemical Dynamics and Their Impact on the Reactivity of Pt Nanoparticles during CO Oxidation by Operando TEM.
In: ACS Catalysis.
Vol. 10
(2020)
Issue 5
.
- pp. 3183-3193.
ISSN 2155-5435
DOI: https://doi.org/10.1021/acscatal.9b03692
Abstract in another language
The finictionality of heterogeneous catalysts is influenced by a delicate interplay of multiple parameters, including morphology and structure, chemical potential gradients and related dynamics. Here, we report on how these factors are interconnected. Combining time-resolved transmission electron microscopy imaging and selected area electron diffraction with online conversion detection, CO oxidation over Pt nanoparticles was studied at a pressure of 700 mbar and temperatures up to 500 degrees C. The different interactions between reactants and catalysts over the entire range of catalytic conversion were investigated. Chemical dynamics in this reaction were found to consist of both morphological transformations and fluctuating structural dynamics. Morphological transformations were observed mostly in low activity regimes, leading to nanoparticles with increased stable surface facets. Meanwhile structural changes were observed during high activity regimes where the partial pressures remained constant. Furthermore, the observed changes were found to occur in both the bulk and the surface of the catalyst. Catalytic cycling revealed that morphological transformations and structural dynamics have different implications on the reactivity and are mostly irreversible.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Additional notes: | WOS:000518876300030 |
| Institutions of the University: | Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Operando-Analytics of Electrochemical Energy Storage > Chair Operando-Analytics of Electrochemical Energy Storage - Univ.-Prof. Dr. Thomas Lunkenbein Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Operando-Analytics of Electrochemical Energy Storage |
| Result of work at the UBT: | No |
| DDC Subjects: | 500 Science > 540 Chemistry |
| Date Deposited: | 13 Jun 2025 07:21 |
| Last Modified: | 04 Jul 2025 11:32 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93705 |