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  Methane oxidation on Pd(111): In situ XPS identification of active phase

Gabasch, H., Hayek, K., Klötzer, B., Unterberger, W., Kleimenov, E., Teschner, D., et al. (2007). Methane oxidation on Pd(111): In situ XPS identification of active phase. Journal of Physical Chemistry C, 111(22), 7957-7962. doi:10.1021/jp068404m.

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J Phys Chem C 111 2007 7957.pdf (Any fulltext), 227KB
 
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 Creators:
Gabasch, Harald1, Author              
Hayek, Konrad, Author
Klötzer, Bernhard, Author
Unterberger, Werner, Author
Kleimenov, Evgueni1, Author              
Teschner, Detre1, Author              
Zafeiratos, Spiros1, Author              
Hävecker, Michael1, Author              
Knop-Gericke, Axel1, Author              
Schlögl, Robert1, Author              
Aszalos-Kiss, Balazs, Author
Zemlyanov, Dimitry, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Palladium, Pd5O4, PdO, methane combustion, in situ XPS catalysis
 Abstract: The reaction between CH4 and O2 (1:5) was studied by in situ XPS during heating and cooling in a 0.33 mbar reaction mixture. During heating, the reaction rate exhibited an activity maximum at 650 K, whereas no activity maximum was found during the subsequent cooling ramp. This kinetic hysteresis was assigned to the spectroscopically observed difference in the surface oxidation state. During heating, the reaction rate approached the 650 K maximum in the stability range of bulk PdO seeds among the otherwise Pd5O4 2D oxide covered surface. On the other hand, no PdO seeds were formed during cooling, most likely due to kinetic limitations of PdO nucleation on a passivating surface oxide layer containing less oxygen than Pd5O4.

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Language(s): eng - English
 Dates: 2006-122007
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 337728
DOI: 10.1021/jp068404m
 Degree: -

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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: 111 (22) Sequence Number: - Start / End Page: 7957 - 7962 Identifier: -