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  Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Li, X., Lunkenbein, T., Kröhnert, J., Pfeifer, V., Girgsdies, F., Rosowski, F., et al. (2016). Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation. Faraday Discussions, 188, 99-113. doi:10.1039/C5FD00191A.

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 Urheber:
Li, Xuan1, 2, Autor           
Lunkenbein, Thomas1, Autor           
Kröhnert, Jutta1, Autor           
Pfeifer, Verena1, 3, Autor           
Girgsdies, Frank1, Autor           
Rosowski, Frank2, 4, Autor
Schlögl, Robert1, Autor           
Trunschke, Annette1, Autor           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2UniCat-BASF Joint Lab, Technische Universität Berlin, 10623, Berlin, Germany, ou_persistent22              
3Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronenspeicherring BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany, ou_persistent22              
4BASF SE, Process Research and Chemical Engineering, Heterogeneous Catalysis, Carl-Bosch-Straße 38, 67056, Ludwigshafen, Germany, ou_persistent22              

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 Zusammenfassung: The mechanism of C-H activation in selective oxidation reactions of short-chain alkane molecules over transition metal oxides is critically affected by the balance of acid-base and redox sites at the surface of the catalyst. Using the example of manganese tungstate we discuss how the relative abundance of these sites can be controlled via synthetic techniques. Phase-pure catalysts composed of the thermodynamic stable monoclinic MnWO4 phase have been prepared by hydrothermal synthesis. Variation of the initial pH value resulted in rod-shaped nano-crystalline MnWO4 catalysts composed of particles with varying aspect ratio. The synthesis products have been analysed by transmission elecron microscopy, X-ray diffraction, infrared, and photoelectron spectroscopy. In-situ Raman spectroscopy was used to investigate the dissolution-re-crystallization processes occuring under hydrothermal conditions. Ethanol oxidation was applied to probe the surface functionalities in terms of acid-base and redox properties. Changes in the aspect ratio of the primary catalyst particles are reflected in the product distribution induced by altering the fraction of acid-base and redox sites exposed at the surface of the catalysts in agreement with the proposed mechanism of particle growth by re-crystallization during ageing under hydrothermal conditions.

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Sprache(n): eng - English
 Datum: 2015-12-082015-12-082016-07-01
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1039/C5FD00191A
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Titel: Faraday Discussions
  Kurztitel : Faraday Discuss.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London : Royal Society of Chemistry
Seiten: 15 Band / Heft: 188 Artikelnummer: - Start- / Endseite: 99 - 113 Identifikator: ISSN: 1359-6640
CoNE: https://pure.mpg.de/cone/journals/resource/954925269326