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  Metal–supported catalysts encapsulated in mesoporous solids: Challenges and opportunities of a model concept

Grünert, W., Gies, H., Muhler, M., Polarz, S., Lehmann, C. W., Grossmann, D., et al. (2013). Metal–supported catalysts encapsulated in mesoporous solids: Challenges and opportunities of a model concept. Physica Status Solidi B: Basic Solid State Physics, 250(6), 1081-1093. doi:10.1002/pssb.201248454.

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 Creators:
Grünert, Wolfgang1, Author
Gies, Hermann2, Author
Muhler, Martin1, Author
Polarz, Sebastian3, Author
Lehmann, Christian W.4, Author              
Grossmann, Dennis1, Author
van den Berg, Maurits1, Author
Tkachenko, Olga P.5, Author
De Toni, Andrea1, Author
Sinev, Ilya1, Author
Bandyopadhyay, Mahuya2, Author
Narkhede, Vaishali2, Author
Dreier, Axel4, Author              
Klementiev, Konstantin V.1, Author
Birkner, Alexander6, Author
Löffler, Elke1, Author
Affiliations:
1Laboratory of Industrial Chemistry, Ruhr University Bochum, P.O. Box 102148, 44780 Bochum, Germany, ou_persistent22              
2Laboratory of Crystallography, Ruhr University Bochum, 44780 Bochum, Germany, ou_persistent22              
3Department of Chemistry, Konstanz University, Konstanz, Germany, ou_persistent22              
4Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              
5Institute of Organic Chemistry, Russian Academy of Science, Moscow, Russia, ou_persistent22              
6Laboratory of Physical Chemistry I, Ruhr University Bochum, 44780 Bochum, Germany, ou_persistent22              

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Free keywords: catalysts; CO oxidation; gold; host–guest systems; methanol synthesis; X-ray absorption spectroscopy
 Abstract: An overview of work with model systems designed to study metal–support interactions in heterogeneous catalysts is given. In these models, metal and support are both miniaturized by introduction as guests into a mesoporous host. The use of such models is demonstrated with Au—TiO2 clusters encaged in MCM-48, and Cu—ZnO clusters encapsulated in siliceous mesopore systems and in carbon nanotubes. The models promise a better opportunity to track changes in the support component during catalyst activation and catalysis, including the action of poisons that may at first be trapped on the support surface. Challenges to be met are the stabilization of the mesoporous matrix during synthesis and catalysis, possible reactivity of the matrix surface towards any of the catalyst components, as well as clustering and segregation of the latter from the matrix. The challenges were encountered as pore damage during preparation of Au—TiO2/MCM-48 catalysts, as deactivating interactions of siliceous walls with zinc ions during deposition of zinc species from aqueous media, and as clustering of the Cu component during calcination and reduction. Among the conclusions drawn from the studies are the irrelevance of order at the Au—TiO2 interface (and, hence, of epitaxy and of crystal strain in gold) for high activity of Au/TiO2 catalysts in CO oxidation. In the models for Cu—ZnO methanol synthesis catalysts, two different types of Cu—Zn interaction could be observed: a direct contact between Zn2+ and Cu(0) under strong reducing conditions, and the formation of alloy nanoparticles (nano-brass). A discussion of the relevance of these interactions for the methanol synthesis reaction is given.

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Language(s): eng - English
 Dates: 2013-02-282012-09-192013-03-222013-04-172013-06
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/pssb.201248454
 Degree: -

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Title: Physica Status Solidi B: Basic Solid State Physics
  Abbreviation : Phys. Status Solidi B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH Verlag GmbH & Co. KGaA
Pages: 13 Volume / Issue: 250 (6) Sequence Number: - Start / End Page: 1081 - 1093 Identifier: ISSN: 0370-1972
CoNE: https://pure.mpg.de/cone/journals/resource/958480240330