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

MPS-Authors
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Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Bluhm,  Hendrik
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Kleimenov,  Evgueni
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Mayer,  Ralf W.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Fait,  Martin
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0CAE-E
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.