Schumacher, Leon ; Ziemba, Marc ; Brunnengräber, Kai ; Totzauer, Lea ; Hofmann, Kathrin ; Etzold, Bastian J. M. ; Albert, Barbara ; Hess, Christian (2024)
Understanding the Reduction Behavior of VOₓ/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In Situ Spectroscopies and X-Ray Diffraction.
In: The Journal of Physical Chemistry C, 2023, 127 (12)
doi: 10.26083/tuprints-00028238
Artikel, Zweitveröffentlichung, Postprint
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
As catalytic processes become more important in academic and industrial applications, an intimate understanding is highly desirable to improve their efficiency on a rational basis. Because thorough mechanistic investigations require an elaborate and expensive spectroscopic and theoretical analysis, it is a major goal to link mechanistic insights to simple descriptors, such as the reducibility, that are accessible by temperature-programmed reduction (TPR) experiments, to bridge the gap between fundamental understanding and application of catalysts. In this work, we present a detailed in-situ spectroscopic analysis of TPR results from loading-dependent VOₓ/CeO₂ catalysts, using in-situ multiwavelength Raman, IR, UV–vis, and quasi-in-situ X-ray photoelectron spectroscopy as well as in-situ X-ray diffraction. The catalyst reduction shows a complex network of different processes, contributing to the overall reducibility, which are controlled by the unique interaction at the vanadia–ceria interface. The temperatures at which they occur depend significantly on the nuclearity of the surface vanadia species. By elucidating the temperature- and vanadia loading-dependent behavior, we provide a fundamental understanding of the underlying molecular processes, thus developing an important basis for interpretation of the reduction behavior of other oxide catalysts.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Schumacher, Leon ; Ziemba, Marc ; Brunnengräber, Kai ; Totzauer, Lea ; Hofmann, Kathrin ; Etzold, Bastian J. M. ; Albert, Barbara ; Hess, Christian |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Understanding the Reduction Behavior of VOₓ/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In Situ Spectroscopies and X-Ray Diffraction |
| Sprache: | Englisch |
| Publikationsjahr: | 6 Dezember 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 20 März 2023 |
| Ort der Erstveröffentlichung: | Washington, DC |
| Verlag: | American Chemical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The Journal of Physical Chemistry C |
| Jahrgang/Volume einer Zeitschrift: | 127 |
| (Heft-)Nummer: | 12 |
| Kollation: | 41 Seiten |
| DOI: | 10.26083/tuprints-00028238 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28238 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | As catalytic processes become more important in academic and industrial applications, an intimate understanding is highly desirable to improve their efficiency on a rational basis. Because thorough mechanistic investigations require an elaborate and expensive spectroscopic and theoretical analysis, it is a major goal to link mechanistic insights to simple descriptors, such as the reducibility, that are accessible by temperature-programmed reduction (TPR) experiments, to bridge the gap between fundamental understanding and application of catalysts. In this work, we present a detailed in-situ spectroscopic analysis of TPR results from loading-dependent VOₓ/CeO₂ catalysts, using in-situ multiwavelength Raman, IR, UV–vis, and quasi-in-situ X-ray photoelectron spectroscopy as well as in-situ X-ray diffraction. The catalyst reduction shows a complex network of different processes, contributing to the overall reducibility, which are controlled by the unique interaction at the vanadia–ceria interface. The temperatures at which they occur depend significantly on the nuclearity of the surface vanadia species. By elucidating the temperature- and vanadia loading-dependent behavior, we provide a fundamental understanding of the underlying molecular processes, thus developing an important basis for interpretation of the reduction behavior of other oxide catalysts. |
| Freie Schlagworte: | Catalysts, Hydrogen, Oxides, Oxygen, Redox reactions |
| Status: | Postprint |
| URN: | urn:nbn:de:tuda-tuprints-282386 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Ernst-Berl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie 07 Fachbereich Chemie > Ernst-Berl-Institut > Fachgebiet Technische Chemie 07 Fachbereich Chemie > Ernst-Berl-Institut > Fachgebiet Technische Chemie > Technische Chemie I |
| Hinterlegungsdatum: | 06 Dez 2024 13:30 |
| Letzte Änderung: | 09 Dez 2024 12:44 |
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Verfügbare Versionen dieses Eintrags
- Understanding the Reduction Behavior of VOₓ/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In Situ Spectroscopies and X-Ray Diffraction. (deposited 06 Dez 2024 13:30) [Gegenwärtig angezeigt]
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