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

Mette, Katharina; Kühl, Stefanie; Tarasov, Andrey; Willinger, Marc Georg; Kröhnert, Jutta; Wrabetz, Sabine; Trunschke, Annette; Scherzer, Michael; Girgsdies, Frank; Düdder, Hendrik; Kähler, Kevin; Friedel Ortega, Klaus; Muhler, Martin; Schlögl, Robert; Behrens, Malte; Lunkenbein, Thomas

doi:10.1021/acscatal.6b01683

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

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

/persons/resource/persons21771

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

/persons/resource/persons32715

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

/persons/resource/persons22243

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

/persons/resource/persons21766

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

/persons/resource/persons22257

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

/persons/resource/persons22181

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

/persons/resource/persons80761

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

/persons/resource/persons21557

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

/persons/resource/persons22071

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

/persons/resource/persons21347

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

/persons/resource/persons41515

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

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-03C8-3

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 Ni_xMg_0.67-xAl_0.33(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.