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High-Temperature Stable Ni Nanoparticles for the Dry Reforming of Methane

MPG-Autoren
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Mette,  Katharina
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Kühl,  Stefanie
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Tarasov,  Andrey
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Willinger,  Marc Georg
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Kröhnert,  Jutta
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Wrabetz,  Sabine
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Trunschke,  Annette
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Scherzer,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Girgsdies,  Frank
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Max-Planck-Institut für Chemische Energiekonversion, Abteilung für Heterogene Reaktionen;

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Behrens,  Malte
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Universität Duisburg-Essen, Fakultät Chemie, Anorganische Chemie;

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Lunkenbein,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Mette, K., Kühl, S., Tarasov, A., Willinger, M. G., Kröhnert, J., Wrabetz, S., et al. (2016). High-Temperature Stable Ni Nanoparticles for the Dry Reforming of Methane. ACS Catalysis, 6(10), 7238-7248. doi:10.1021/acscatal.6b01683.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002C-03C8-3
Zusammenfassung
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·mH2O prepared by constant-pH coprecipitation. The obtained Ni/MgAl oxide catalysts contain Ni nanoparticles with diameters between 7 and 20 nm. High-resolution transmission electron microscopy (HR-TEM) 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 Ni0 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.