Schumacher, Leon ; Funke, Marius ; Hess, Christian (2024)
Unraveling the mechanism of the CO2-assisted oxidative dehydrogenation of propane over VOx/CeO2: an operando spectroscopic study.
In: RSC Sustainability
doi: 10.1039/D4SU00527A
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The CO 2 -assisted oxidative dehydrogenation (ODH) of propane is of great interest for the usage of CO 2 in chemical industry. Vanadia-based catalysts are a promising material class, which can replace highly toxic CrO x , the current state-of-the-art catalyst. Ceria is a commonly used support material in CO 2 activation but has not yet been used as a vanadia support for CO 2 -assisted propane ODH. In this study, we address the interplay between vanadia and ceria as well as the nuclearity-dependent reaction behavior of VO x /CeO 2 catalysts using XRD, multi-wavelength Raman, UV-Vis, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). While the vanadia loading increases the selectivity, the catalysts exhibit a significant amount of side reactions, including most prominently the total oxidation over bare ceria on surface oxygen sites due to their high reducibility and propane dry reforming (PDR) over catalysts with high vanadia loading. Mechanistic analysis reveals that dimers can transfer hydrogen from propane to the ceria lattice, forming Ce-H or to a monodentate carbonate, facilitating the reverse water-gas shift reaction (RWGSR), whereas a transfer to bridged Ce-OH surface species leads to total oxidation due to the high reactivity of the formed surface species. Oligomers facilitate PDR due to their high reducibility and the active oxygen site shifts from ceria to vanadia. The catalyst can be regenerated via carbonates, which are highly stable and can subsequently deactivate the catalyst surface. Our results highlight the benefit of applying multiple operando spectroscopies to enhance the mechanistic understanding of materials relevant for CO 2 activation and further the knowledge-based optimization of catalytic performance.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Schumacher, Leon ; Funke, Marius ; Hess, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Unraveling the mechanism of the CO2-assisted oxidative dehydrogenation of propane over VOx/CeO2: an operando spectroscopic study |
| Sprache: | Englisch |
| Publikationsjahr: | November 2024 |
| Verlag: | The Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | RSC Sustainability |
| DOI: | 10.1039/D4SU00527A |
| Kurzbeschreibung (Abstract): | The CO 2 -assisted oxidative dehydrogenation (ODH) of propane is of great interest for the usage of CO 2 in chemical industry. Vanadia-based catalysts are a promising material class, which can replace highly toxic CrO x , the current state-of-the-art catalyst. Ceria is a commonly used support material in CO 2 activation but has not yet been used as a vanadia support for CO 2 -assisted propane ODH. In this study, we address the interplay between vanadia and ceria as well as the nuclearity-dependent reaction behavior of VO x /CeO 2 catalysts using XRD, multi-wavelength Raman, UV-Vis, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). While the vanadia loading increases the selectivity, the catalysts exhibit a significant amount of side reactions, including most prominently the total oxidation over bare ceria on surface oxygen sites due to their high reducibility and propane dry reforming (PDR) over catalysts with high vanadia loading. Mechanistic analysis reveals that dimers can transfer hydrogen from propane to the ceria lattice, forming Ce-H or to a monodentate carbonate, facilitating the reverse water-gas shift reaction (RWGSR), whereas a transfer to bridged Ce-OH surface species leads to total oxidation due to the high reactivity of the formed surface species. Oligomers facilitate PDR due to their high reducibility and the active oxygen site shifts from ceria to vanadia. The catalyst can be regenerated via carbonates, which are highly stable and can subsequently deactivate the catalyst surface. Our results highlight the benefit of applying multiple operando spectroscopies to enhance the mechanistic understanding of materials relevant for CO 2 activation and further the knowledge-based optimization of catalytic performance. |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 07 Nov 2024 13:08 |
| Letzte Änderung: | 07 Nov 2024 13:15 |
| PPN: | 523300573 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum