Waleska, Philipp ; Hess, Christian (2024)
Structural Dynamics of Dispersed Titania During Dehydration and Oxidative Dehydrogenation Studied by In Situ UV Raman Spectroscopy.
In: Catalysis Letters, 2018, 148 (8)
doi: 10.26083/tuprints-00028230
Artikel, Zweitveröffentlichung, Postprint
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Kurzbeschreibung (Abstract)
The structural dynamics of dispersed titania, i.e., silica supported titania, is investigated during dehydration and oxidative dehydrogenation (ODH) of ethanol using optical spectroscopy. UV Raman spectroscopy enabling resonance enhancements proves to be a valuable tool to identify Ti–OH, Ti–O–Si, and Ti–O–Ti groups. Upon dehydration, a transformation of Ti–OH into Ti–O–Si and Ti–O–Ti groups is observed. Two types of Ti–OH vibrations (isolated, geminal) are identified at around 700 and 800 cm⁻¹ in agreement with theoretical models. Dispersed titania is catalytically active in ethanol ODH with a performance comparable to dispersed vanadia. In situ UV Raman spectra reveal a consumption of Ti–O–Ti, Ti–O–Si, and Ti–OH groups during ethanol adsorption to the titania surface. The presented results are consistent with an ODH reaction mechanism involving a structural transformation of oligomerized or closely neighbored monomeric TiOₓ structures. The relevance of the proposed mechanism is discussed in the context of other supported transition metal oxide catalysts.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Waleska, Philipp ; Hess, Christian |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Structural Dynamics of Dispersed Titania During Dehydration and Oxidative Dehydrogenation Studied by In Situ UV Raman Spectroscopy |
| Sprache: | Englisch |
| Publikationsjahr: | 29 Oktober 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 5 Juni 2018 |
| Ort der Erstveröffentlichung: | Dordrecht [u.a.] |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Catalysis Letters |
| Jahrgang/Volume einer Zeitschrift: | 148 |
| (Heft-)Nummer: | 8 |
| Kollation: | 28 Seiten |
| DOI: | 10.26083/tuprints-00028230 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/28230 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichungsservice |
| Kurzbeschreibung (Abstract): | The structural dynamics of dispersed titania, i.e., silica supported titania, is investigated during dehydration and oxidative dehydrogenation (ODH) of ethanol using optical spectroscopy. UV Raman spectroscopy enabling resonance enhancements proves to be a valuable tool to identify Ti–OH, Ti–O–Si, and Ti–O–Ti groups. Upon dehydration, a transformation of Ti–OH into Ti–O–Si and Ti–O–Ti groups is observed. Two types of Ti–OH vibrations (isolated, geminal) are identified at around 700 and 800 cm⁻¹ in agreement with theoretical models. Dispersed titania is catalytically active in ethanol ODH with a performance comparable to dispersed vanadia. In situ UV Raman spectra reveal a consumption of Ti–O–Ti, Ti–O–Si, and Ti–OH groups during ethanol adsorption to the titania surface. The presented results are consistent with an ODH reaction mechanism involving a structural transformation of oligomerized or closely neighbored monomeric TiOₓ structures. The relevance of the proposed mechanism is discussed in the context of other supported transition metal oxide catalysts. |
| Freie Schlagworte: | Titania, UV Raman spectroscopy, Oxidative dehydrogenation (ODH), In situ, Structural dynamics |
| Status: | Postprint |
| URN: | urn:nbn:de:tuda-tuprints-282300 |
| 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 13:23 |
| Letzte Änderung: | 30 Okt 2024 08:59 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Structural Dynamics of Dispersed Titania During Dehydration and Oxidative Dehydrogenation Studied by In Situ UV Raman Spectroscopy. (deposited 29 Okt 2024 13:23) [Gegenwärtig angezeigt]
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