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Catalysis Science & Technology Vol - 2 Issue - 6

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Catalysis Science & Technology Vol - 2 Issue - 3

Catalysis Science & Technology Vol - 2 Issue - 2

Catalysis Science & Technology Vol -1

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Hävecker, Michael Carrero, Carlos Kröhnert, Jutta Schomäcker, Reinhard Wolfram, Till Müller, Genka Tzolova Hamilton, Neil Schlögl, Robert Trunschke, Annette
Copyright Year	2012
Abstract	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.
Starting Page	1346
Ending Page	1359
Page Count	14
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	2
Issue Number	7
Journal	Catalysis Science & Technology
DOI	10.1039/c2cy00541g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electron microscope Spectroscopy Monolayer Vanadium Topology Nitrogen Grafting Silicon dioxide Composite material X-ray crystallography Propene X-ray fluorescence Adsorption Total Metal Dehydrogenation FTIR Mesoporous silica Titanium Raman Library Titanium dioxide Propane
Content Type	Text
Resource Type	Article
Subject	Catalysis

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