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Mette, Katharina ; Kühl, Stefanie ; Tarasov, Andrey ; Willinger, Marc G. ; Kröhnert, Jutta ; Wrabetz, Sabine ; Trunschke, Annette ; Scherzer, Michael ; Girgsdies, Frank ; Düdder, Hendrik ; Kähler, Kevin ; Ortega, Klaus Friedel ; Muhler, Martin ; Schlögl, Robert ; Behrens, Malte ; Lunkenbein, Thomas:
High-Temperature Stable Ni Nanoparticles for the Dry Reforming of Methane.
In: ACS Catalysis.
Bd. 6
(2016)
Heft 10
.
- S. 7238-7248.
ISSN 2155-5435
DOI: https://doi.org/10.1021/acscatal.6b01683
Abstract
Dry reforming of methane (DRM) has been studied for many years as an attractive option to produce synthesis gas. However, catalyst deactivation by coking over nonprecious-metal catalysts still remains unresolved. Here, we study the influence of structural and compositional properties of nickel catalysts on the catalytic performance and coking propensity in the DRM. A series of bulk catalysts with different Ni contents was synthesized by calcination of hydrotalcite-like precursors NixMg0.67-xAl0.33(OH)(2)(CO3)(0.17)center dot mH(2)O prepared by constant-pH coprecipitation. The obtained Ni/MgAI oxide catalysts contain Ni nanoparticles with diameters between 7 and 20 nm. High-resolution transmission electron microscopy (HRTEM) revealed a nickel aluminate overgrowth on the Ni particles, which could be confirmed by Fourier transform infrared (FTIR) spectroscopy. In particular, catalysts with low Ni contents (5 mol %) exhibit predominantly oxidic surfaces dominated by Ni2+ and additionally some isolated Ni-0 sites. These properties, which are determined by the overgrowth, effectively diminish the formation of coke during the DRM, while the activity is preserved. A large (TEM) and dynamic (microcalorimetry) metallic Ni surface at high Ni contents (50 mol %) causes significant coke formation during the DRM.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | WOS:000385057900110 |
| 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 08:28 |
| Letzte Änderung: | 13 Jun 2025 08:28 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93726 |