Ober, Patrick ; Rogg, Simone ; Hess, Christian (2024)
Direct Evidence for Active Support Participation in Oxide Catalysis: Multiple Operando Spectroscopy of VOₓ/Ceria.
In: ACS Catalysis, 2020, 10 (5)
doi: 10.26083/tuprints-00028248
Artikel, Zweitveröffentlichung, Postprint
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Kurzbeschreibung (Abstract)
Ceria-supported vanadia is catalytically active in oxidative dehydrogenation (ODH) reactions. Here, we provide direct spectroscopic evidence for the participation of the ceria support in the redox catalysis. To unravel the structural dynamics of vanadia/ceria (VOₓ/CeO₂) catalysts during ethanol ODH, we have applied a combination of operando multiwavelength Raman and operando UV–vis spectroscopy. Our approach consists of the targeted use of different Raman excitation wavelengths, enabling the selective enhancement of ceria (at 385 nm) and vanadia (at 515 nm) vibrational features. As part of the support dynamics, ceria lattice oxygen is shown to directly participate in the ODH reaction, while V–O–Ce interface bonds are broken during substrate adsorption, resulting in ethoxide formation. The presence of V–O–Ce bonds is considered to be crucial for the observed synergy effect in catalytic performance, allowing ceria to act as an oxygen buffer stabilizing the vanadium center. By providing an experimental basis for a detailed understanding of working VOₓ/CeO₂ catalysts, our results highlight the importance of active support participation in oxide catalysis.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Ober, Patrick ; Rogg, Simone ; Hess, Christian |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Direct Evidence for Active Support Participation in Oxide Catalysis: Multiple Operando Spectroscopy of VOₓ/Ceria |
| Sprache: | Englisch |
| Publikationsjahr: | 29 Oktober 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 3 Februar 2020 |
| Ort der Erstveröffentlichung: | Washington, DC |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | ACS Catalysis |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 5 |
| Kollation: | 32 Seiten |
| DOI: | 10.26083/tuprints-00028248 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28248 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | Ceria-supported vanadia is catalytically active in oxidative dehydrogenation (ODH) reactions. Here, we provide direct spectroscopic evidence for the participation of the ceria support in the redox catalysis. To unravel the structural dynamics of vanadia/ceria (VOₓ/CeO₂) catalysts during ethanol ODH, we have applied a combination of operando multiwavelength Raman and operando UV–vis spectroscopy. Our approach consists of the targeted use of different Raman excitation wavelengths, enabling the selective enhancement of ceria (at 385 nm) and vanadia (at 515 nm) vibrational features. As part of the support dynamics, ceria lattice oxygen is shown to directly participate in the ODH reaction, while V–O–Ce interface bonds are broken during substrate adsorption, resulting in ethoxide formation. The presence of V–O–Ce bonds is considered to be crucial for the observed synergy effect in catalytic performance, allowing ceria to act as an oxygen buffer stabilizing the vanadium center. By providing an experimental basis for a detailed understanding of working VOₓ/CeO₂ catalysts, our results highlight the importance of active support participation in oxide catalysis. |
| Freie Schlagworte: | active support, oxide catalysis, oxidative dehydrogenation, operando spectroscopy, vanadia, ceria |
| Status: | Postprint |
| URN: | urn:nbn:de:tuda-tuprints-282482 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 29 Okt 2024 13:50 |
| Letzte Änderung: | 30 Okt 2024 09:22 |
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- Direct Evidence for Active Support Participation in Oxide Catalysis: Multiple Operando Spectroscopy of VOₓ/Ceria. (deposited 29 Okt 2024 13:50) [Gegenwärtig angezeigt]
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