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  Dynamic surface behaviour of VPO catalysts under reactive and non-reactive gas compositions: an in-situ XAS study

Hävecker, M., Knop-Gericke, A., Bluhm, H., Kleimenov, E., Mayer, R. W., Fait, M., et al. (2004). Dynamic surface behaviour of VPO catalysts under reactive and non-reactive gas compositions: an in-situ XAS study. Applied Surface Science, 230(1-4), 272-282. doi:10.1016/j.apsusc.2004.02.037.

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 Creators:
Hävecker, Michael1, Author              
Knop-Gericke, Axel1, Author              
Bluhm, Hendrik1, Author              
Kleimenov, Evgueni1, Author              
Mayer, Ralf W.1, Author              
Fait, Martin1, Author              
Schlögl, Robert1, Author              
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1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: vanadium phosphorus oxide (VPO); X-ray absorption spectroscopy (XAS); vanadium L3-edge; n-butane oxidation; electronic structure 14, n-butane oxidation on VPO catalysts
 Abstract: The surface of an activated vanadium phosphorus oxide (VPO) catalyst was investigated by means of in situ X-ray absorption spectroscopy in the total electron yield mode. We observed significant changes of the V L3-near edge X-ray absorption fine structure (NEXAFS) when the material was transferred from room temperature to working conditions at 400°C in the reaction atmosphere. We studied the same VPO material under different gas compositions comprising the reaction mixture of n-butane and oxygen, pure oxygen and vacuum to elucidate the influence of the gas-surface interaction and the effect of the temperature. The results of this extensive study indicate a dynamic response of the catalyst surface to the applied conditions.

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 Dates: 2004-02-192004-04-17
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: eDoc: 21818
DOI: 10.1016/j.apsusc.2004.02.037
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Title: Applied Surface Science
  Alternative Title : Appl. Surf. Sci.
Source Genre: Journal
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Pages: - Volume / Issue: 230 (1-4) Sequence Number: - Start / End Page: 272 - 282 Identifier: -