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  Phase development in the catalytic system V2O5/TiO2 under oxidising conditions

Habel, D., Feike, E., Schröder, C., Schubert, H., Hösch, A., Stelzer, J. B., et al. (2006). Phase development in the catalytic system V2O5/TiO2 under oxidising conditions. In A. Wereszcak, E. Lara-Curzio, & W. Mullins (Eds.), Synthesis and Processing of Nanostructured Materials, Ceramic Engineering and Science Proceedings (pp. 69-80). Weinheim: Wiley-VCH.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-06D2-0 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-E702-4
Genre: Conference Paper

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 Creators:
Habel, Daniela, Author
Feike, Egbert, Author
Schröder, C., Author
Schubert, Helmut, Author
Hösch, A., Author
Stelzer, Jean Boris, Author
Caro, Jürgen, Author
Hess, Christian1, Author           
Knop-Gericke, Axel1, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: V2O5/TiO2; nanostructures; V2O5/TiO2
 Abstract: The target of this work was to investigate phase development in the catalyst system consisting of TiO2 (Anatase) and V2O5 (Shcherbinaite). Thus a set of V2O5/TiO2 specimens was prepared by ball milling and exposed to subsequent annealing in air in the temperature range from 400 to 700 °C. The XRD-results showed the presence of Anatase and Shcherbinaite as the only phases up to 525 °C. For temperatures above 525 °C Rutile as a new TiO2-phase occured. Peak intensities and positions were shifted. No loss of oxygen or vanadium was detected. The reaction involves the formation of a Rutile solid solution containing VOx species. XPS studies showed an oxidation state of 4.75 for V in the Rutile solid solution as compared to 4.65 in the Shcherbinaite. The Rutile solid solution was first found at 525 °C < T < 550 °C for compositions of 3 mole % < V2O5 < 5 mole %. The phase field for Rutile solid solutions extends to 10 mole%< V2O5 <12.5 mole % at 675 °C. For very high V2O5 concentrations an eutectic reaction was found at 631 °C (95 mole% V2O5 A Shcherbinaite structure remained with shifted peak intensities and positions due to the alloying of Ti-ions. SEM inspections showed that the Rutile formation and the eutectic reaction both cause a substantial grain growth and a loss of surface area. The catalytic activity is entirely lost. The knowledge of phase relations helps to find the appropriate processing conditions and to understand the aging phenomena of catalysts.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Issued
 Pages: 138 pages; paperback
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 430075
DOI: 10.1002/9780470291375.ch8
 Degree: -

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Title: 30th International Conference on Advanced Ceramics and Composites
Place of Event: Cocoa Beach, Florida [USA]
Start-/End Date: 2006-01-22 - 2006-01-27

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Title: Synthesis and Processing of Nanostructured Materials, Ceramic Engineering and Science Proceedings
Source Genre: Proceedings
 Creator(s):
Wereszcak, Andrew, Editor
Lara-Curzio, Edgar, Editor
Mullins, William, Editor
Affiliations:
-
Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: (8) Sequence Number: - Start / End Page: 69 - 80 Identifier: ISBN: 978-0-470-08051-1