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Sandoval-Diaz, Luis ; Plodinec, Milivoj ; Ivanov, Danail ; Poitel, Stéphane ; Hammud, Adnan ; Nerl, Hannah C. ; Schlögl, Robert ; Lunkenbein, Thomas:
Visualizing the importance of oxide-metal phase transitions in the production of synthesis gas over Ni catalysts.
In: Journal of Energy Chemistry.
Bd. 50
(2020)
.
- S. 178-186.
ISSN 2096-885X
DOI: https://doi.org/10.1016/j.jechem.2020.03.013
Abstract
Synthesis gas, composed of H-2 and CO, is an important fuel which serves as feedstock for industrially relevant processes, such as methanol or ammonia synthesis. The efficiency of these reactions depends on the H-2 : CO ratio, which can be controlled by a careful choice of reactants and catalyst surface chemistry. Here, using a combination of environmental scanning electron microscopy (ESEM) and online mass spec-trometry, direct visualization of the surface chemistry of a Ni catalyst during the production of synthesis gas was achieved for the first time. The insertion of a homebuilt quartz tube reactor in the modified ESEM chamber was key to success of the setup. The nature of chemical dynamics was revealed in the form of reversible oxide-metal phase transitions and surface transformations which occurred on the per-forming catalyst. The oxide-metal phase transitions were found to control the production of synthesis gas in the temperature regime between 700 and 900 degrees C in an atmosphere relevant for dry reforming of methane (DRM, CO2 : CH4 = 0.75). This was confirmed using high resolution transmission electron mi-croscopy imaging, electron energy loss spectroscopy, thermal analysis, and (CO2)-O-18 labelled experiments. Our dedicated operando approach of simultaneously studying the surface processes of a catalyst and its activity allowed to uncover how phase transitions can steer catalytic reactions.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:000569401000005 |
| Keywords: | Dry reforming of methane; Partial oxidation of methane; Environmental scanning electron microscopy; Synthesis gas; Operando |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie |
| Titel an der UBT entstanden: | Nein |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 540 Chemie |
| Eingestellt am: | 13 Jun 2025 06:47 |
| Letzte Änderung: | 13 Jun 2025 06:47 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93694 |