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  Topology of silica supported vanadium–titanium oxide catalysts for oxidative dehydrogenation of propane

Hamilton, N., Wolfram, T., Tzolova-Müller, G., Hävecker, M., Kröhnert, J., Carrero, C., et al. (2012). Topology of silica supported vanadium–titanium oxide catalysts for oxidative dehydrogenation of propane. Catalysis science & technology, 2(7), 1346-1359. doi:10.1039/C2CY00541G.

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2012
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Hamilton, Neil1, Autor           
Wolfram, Till1, Autor           
Tzolova-Müller, Genka1, Autor           
Hävecker, Michael2, Autor           
Kröhnert, Jutta1, Autor           
Carrero, Carlos3, Autor
Schomäcker, Reinhard3, Autor
Trunschke, Annette1, Autor           
Schlögl, Robert1, Autor           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Department of Solar Energy Research, Helmholtz-Zentrum Berlin/ c BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany, ou_persistent22              
3Technical University Berlin, Department of Chemistry, Strasse des 17. Juni 124, 10623 Berlin, Germany, ou_persistent22              

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 Zusammenfassung: Two-dimensional vanadia and titania surface clusters were hosted on the walls of the hierarchical pore system of mesoporous silica SBA-15. The topology of the catalyst surface was varied by sequential grafting of vanadium and titanium alkoxides generating an extended library of mixed (VOx)n–(TiOx)n/SBA-15 catalysts. The surface of the catalysts was analyzed by FTIR, UV-vis, Raman, and NEXAFS spectroscopy. Electron microscopy, X-ray fluorescence, X-ray diffraction, and nitrogen adsorption have been applied to characterize chemical composition, micro- and meso-structure of the materials. Segregation of nano-crystalline vanadia and titania particles was excluded by UV-vis, Raman and NEXAFS spectroscopy. Monolayer coverage of titanium oxide surface species has been achieved in the range between 17 and 19 wt% Ti loading corresponding to 6–8 Ti atoms per nmcat2 and Si/Ti ratios between 3.3 and 2.8. Up to a critical total metal loading, vanadia is grafted on both the silica surface and surface titania species yielding tetrahedrally coordinated vanadium oxo-species characterized by low nuclearity and moderate catalytic activity. A volcano-type dependency with respect to the propylene space-time yield has been observed in the oxidative dehydrogenation of propane. The maximum in productivity of propylene is attributed to a particular surface topology that is characterized by (VOx)n islands embedded in a matrix of dispersed titania species forming an almost complete combined vanadia–titania monolayer on the silica surface.

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Sprache(n): eng - English
 Datum: 2012-03-062012
 Publikationsstatus: Erschienen
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 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1039/C2CY00541G
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Titel: Catalysis science & technology
  Andere : Catalysis science and technology
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Cambridge : RSC
Seiten: - Band / Heft: 2 (7) Artikelnummer: - Start- / Endseite: 1346 - 1359 Identifikator: Anderer: 2044-4753
CoNE: https://pure.mpg.de/cone/journals/resource/2044-4753