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Chen, Shilong ; Jelic, Jelena ; Rein, Denise ; Najafishirtari, Sharif ; Schmidt, Franz-Philipp ; Girgsdies, Frank ; Kang, Liqun ; Wandzilak, Aleksandra ; Rabe, Anna ; Doronkin, Dmitry E. ; Wang, Jihao ; Ortega, Klaus Friedel ; DeBeer, Serena ; Grunwaldt, Jan-Dierk ; Schlögl, Robert ; Lunkenbein, Thomas ; Studt, Felix ; Behrens, Malte:
Highly loaded bimetallic iron-cobalt catalysts for hydrogen release from ammonia.
In: Nature Communications.
Bd. 15
(2024)
.
- 871.
ISSN 2041-1723
DOI: https://doi.org/10.1038/s41467-023-44661-6
Abstract
Ammonia is a storage molecule for hydrogen, which can be released by catalytic decomposition. Inexpensive iron catalysts suffer from a low activity due to a too strong iron-nitrogen binding energy compared to more active metals such as ruthenium. Here, we show that this limitation can be overcome by combining iron with cobalt resulting in a Fe-Co bimetallic catalyst. Theoretical calculations confirm a lower metal-nitrogen binding energy for the bimetallic catalyst resulting in higher activity. Operando spectroscopy reveals that the role of cobalt in the bimetallic catalyst is to suppress the bulk-nitridation of iron and to stabilize this active state. Such catalysts are obtained from Mg(Fe,Co)2O4 spinel pre-catalysts with variable Fe:Co ratios by facile co-precipitation, calcination and reduction. The resulting Fe-Co/MgO catalysts, characterized by an extraordinary high metal loading reaching 74 wt.%, combine the advantages of a ruthenium-like electronic structure with a bulk catalyst-like microstructure typical for base metal catalysts.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:001153927700024 |
| 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: | 12 Jun 2025 08:00 |
| Letzte Änderung: | 12 Jun 2025 08:00 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93664 |