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  In Situ X-ray Photoelectron Spectroscopy of Catalytic Ammonia Oxidation over a Pt(533) Surface

Günther, S., Scheibe, A., Bluhm, H., Hävecker, M., Kleimenov, E., Knop-Gericke, A., et al. (2008). In Situ X-ray Photoelectron Spectroscopy of Catalytic Ammonia Oxidation over a Pt(533) Surface. Journal of Physical Chemistry C, 112(39), 15382-15393. doi:10.1021/jp803264v.

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 Creators:
Günther, Sebastian, Author
Scheibe, Axel, Author
Bluhm, Hendrik1, Author              
Hävecker, Michael1, Author              
Kleimenov, Evgueni1, Author              
Knop-Gericke, Axel1, Author              
Schlögl, Robert1, Author              
Imbihl, Ronald, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Catalysis; in situ XPS; ammonia oxidation; Pt-oxides; Si impurities; surface oxides Ammonia oxidation over Pt
 Abstract: The NH3 + O2 reaction on a Pt(533) surface has been studied in the 10−4 mbar range and close to 1 mbar pressure with in situ X-ray photoelectron spectroscopy using synchrotron radiation. The coverages of the various O- and N-containing surface species have been followed in T-cycling experiments with varying mixing ratios O2/NH3 and varying total pressure. In heating/cooling cycles hysteresis of ∼50−100 K width occur. Adsorbed NOad already decomposes at T > 350 K. Under stationary conditions, no adsorbed NO could be detected. At no time during the experiments were Pt bulk oxides formed. A shift in the surface core level component of the Pt 4f spectrum by more than 0.5 eV toward higher binding energy is attributed to Pt atoms of the (100) step edges which are coordinated to more than one oxygen atom similar to the model proposed by Wang et al. Phys. Rev. Lett. 2005, 95, 256102.

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Language(s): eng - English
 Dates: 2008
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 400245
DOI: 10.1021/jp803264v
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Title: Journal of Physical Chemistry C
  Alternative Title : J. Phys. Chem. C
Source Genre: Journal
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Pages: - Volume / Issue: 112 (39) Sequence Number: - Start / End Page: 15382 - 15393 Identifier: -