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  In Situ Investigation of the nature of the active surface of a vanadyl pyrophosphate catalyst during the n-butane oxidation to maleic anhydride

Hävecker, M., Mayer, R. W., Knop-Gericke, A., Bluhm, H., Kleimenov, E., Liskowski, A., et al. (2003). In Situ Investigation of the nature of the active surface of a vanadyl pyrophosphate catalyst during the n-butane oxidation to maleic anhydride. Journal of Physical Chemistry B, 107(19), 4587-4596.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-11E3-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-11E3-F
Genre: Journal Article

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In_situ_VPO_JPCB_2003.pdf (Any fulltext), 855KB
 
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 Creators:
Hävecker, Michael1, Author              
Mayer, Ralf W.1, Author              
Knop-Gericke, Axel1, Author              
Bluhm, Hendrik1, Author              
Kleimenov, Evgueni1, Author              
Liskowski, Andrzej1, Author              
Su, Dang Sheng1, Author              
Follath, Rolf, Author
Requejo, Felix G., Author
Ogletree, D. Frank1, Author              
Salmeron, Miquel, Author
Lopez-Sanchez, J. Antonio, Author
Bartley, Jonathon K., Author
Hutchings, Graham J, Author
Schlögl, Robert1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: 14, n-butane oxidation over VPO
 Abstract: In situ X-ray absorption spectroscopy (XAS) and in situ X-ray photoelectron spectroscopy (XPS) have been applied to study the active surface of vanadium phosphorus oxide (VPO) catalysts in the course of the oxidation of n-butane to maleic anhydride (MA). The V L3 near edge X-ray absorption fine structure (NEXAFS) of VPO is related to the details of the bonding between the central vanadium atom and the surrounding oxygen atoms. Reversible changes of the NEXAFS were observed when going from room temperature to the reaction conditions. These changes are interpreted as dynamic rearrangements of the VPO surface, and the structural rearrangements are related to the catalytic activity of the material that was verified by proton transfer reaction mass spectrometry (PTR-MS). The physical origin of the variation of the NEXAFS is discussed and a tentative assignment to specific V-O bonds in the VPO structure is given. In situ XPS investigations were used to elucidate the surface electronic conductivity and to probe the ground state of the NEXAFS spectra.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Rev. Method: Peer
 Identifiers: eDoc: 8399
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Title: Journal of Physical Chemistry B
Source Genre: Journal
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Pages: - Volume / Issue: 107 (19) Sequence Number: - Start / End Page: 4587 - 4596 Identifier: -