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

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.

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Mette, Katharina1, Author              
Kühl, Stefanie1, Author              
Tarasov, Andrey1, Author              
Willinger, Marc Georg1, Author              
Kröhnert, Jutta1, Author              
Wrabetz, Sabine1, Author              
Trunschke, Annette1, Author              
Scherzer, Michael1, Author              
Girgsdies, Frank1, Author              
Düdder, Hendrik2, Author
Kähler, Kevin2, 3, Author
Friedel Ortega, Klaus4, Author
Muhler, Martin2, Author
Schlögl, Robert1, 3, Author              
Behrens, Malte1, 4, Author              
Lunkenbein, Thomas1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Ruhr-Universität Bochum, Lehrstuhl für Technische Chemie, Universitätsstraße 150, 44801 Bochum, Germany, ou_persistent22              
3Max-Planck-Institut für Chemische Energiekonversion, Abteilung für Heterogene Reaktionen, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany, ou_persistent22              
4Universität Duisburg-Essen, Fakultät Chemie, Anorganische Chemie, Universitätsstraße 7, 45141 Essen, Germany, ou_persistent22              

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 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·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.

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 Dates: 2016-08-262016-06-142016-09-282016-10-07
 Publication Status: Published in print
 Pages: 11
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acscatal.6b01683
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Title: ACS Catalysis
  Abbreviation : ACS Catal.
Source Genre: Journal
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Publ. Info: Washington, DC : ACS
Pages: 11 Volume / Issue: 6 (10) Sequence Number: - Start / End Page: 7238 - 7248 Identifier: Other: 2155-5435
CoNE: https://pure.mpg.de/cone/journals/resource/2155-5435