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  How to control selectivity in alkane oxidation?

Li, X., Teschner, D., Pfeifer, V., Lunkenbein, T., Masliuk, L., Fu, T., et al. (2019). How to control selectivity in alkane oxidation? Chemical Science, 10(8), 2429-2443. doi:10.1039/C8SC04641G.

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 Creators:
Li, Xuan1, 2, Author              
Teschner, Detre1, 3, Author              
Pfeifer, Verena1, Author              
Lunkenbein, Thomas1, Author              
Masliuk, Liudmyla1, Author              
Fu, Teng1, Author              
Wang, Yuanqing1, 2, Author              
Jones, Travis1, Author              
Seitz, Friedrich1, Author
Girgsdies, Frank1, Author              
Rosowski, Frank2, 4, Author
Schlögl, Robert1, 3, Author              
Trunschke, Annette1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2UniCat-BASF Joint Lab, Technische Universität Berlin, Sekr. EW K 01, Hardenbergstraße 36, 10623 Berlin, Germany, ou_persistent22              
3Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, ou_persistent22              
4BASF SE, Process Research and Chemical Engineering, Heterogeneous Catalysis, Carl-Bosch-Straße 38, 67056, Ludwigshafen, Germany, ou_persistent22              

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 Abstract: The well-defined particle morphology of crystalline MnWO4 catalysts investigated in the present study facilitates obtaining insight into the origin of selectivity limitations in alkane oxidation. Hydrothermal synthesis at variable pH values granted access to a series of phase-pure MnWO4 catalysts with particles ranging from cube-like (aspect ratio 1.5) to rod- or needle-like (aspect ratio 6.8) shapes. Kinetic studies reveal a strong dependence of the propane consumption rate on the particle shape. The true origin of the structure sensitivity was unraveled by comprehensive bulk and surface analysis using nitrogen adsorption, XRD, SEM, ADF-STEM, STEM-EELS, XPS, multi-laser excitation Raman and DRIFT/operando FTIR spectroscopies, temperature-programmed oxidation (TPO), in situ NEXAFS, and DFT calculations. The active phase is composed of a thin manganese oxy-hydroxide layer formed on the surface of crystalline MnWO4. The differences in catalytic performance within the series clearly illustrate that the structural motif as the most popular descriptor in oxidation catalysis is not essential, since all MnWO4 catalysts in the series under study exhibit the same bulk crystal structure and bulk chemical composition and are phase pure and homogenous. The variable particle shape serves as a proxy that reflects the formation of varying abundance of redox active Mn2+/Mn3+ surface sites, which correlates with catalytic activity. Operando FTIR spectroscopy directly confirms the formation of Mn–OH surface species by abstraction of hydrogen atoms from the propane molecule on nucleophilic oxygen atoms and suggests that active site regeneration occurs via oxidative dehydrogenation of Mn–OH species indicating a single-site nature of the active sites that does not allow four-electron reduction of molecular oxygen. Instead, intermediates are created that cause side reactions and lower the selectivity. The findings highlight fundamental design criteria that may be applied to advance the development of new alkane oxidation catalysts with improved selectivity.

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Language(s): eng - English
 Dates: 2018-10-182018-12-202019-02-28
 Publication Status: Published online
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/C8SC04641G
 Degree: -

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Title: Chemical Science
  Other : Chem. Sci.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: 15 Volume / Issue: 10 (8) Sequence Number: - Start / End Page: 2429 - 2443 Identifier: ISSN: 2041-6520
CoNE: https://pure.mpg.de/cone/journals/resource/2041-6520