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Journal Article

Kinetics of Palladium Oxidation in the mbar Pressure Range: Ambient Pressure XPS Study

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons22278

Zafeiratos,  Spiros
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
LMSPC-UMR 7515 du CNRS;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22163

Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22078

Schnörch,  Peter
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22195

Vass,  Elaine M.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Johnson Matthey Catalysts;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21590

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21743

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22071

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

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Fulltext (public)

2013_01_29_PalladiumOxidation.pdf
(Any fulltext), 482KB

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Citation

Zemlyanov, D., Klötzer, B., Gabasch, H., Smeltz, A., Ribeiro, F. H., Zafeiratos, S., et al. (2013). Kinetics of Palladium Oxidation in the mbar Pressure Range: Ambient Pressure XPS Study. Topics in Catalysis, 56(11), 885-895. doi:10.1007/s11244-013-0052-z.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-3EAC-F
Abstract
Palladium oxidation was studied by ambient-pressure X-ray photoelectron spectroscopy in the mbar pressure range on the Pd(111) and Pd(110) surfaces. The oxidation kinetics on both surfaces show an induction period when the oxidation rate was low at the beginning and then accelerated. The slow initial oxidation is governed by (a) the rate of nucleus formation, and (b) the rate of oxide nucleus growth. Depth profiling varying photon energy/kinetic photoelectron energy pointed to a 3D oxidation. It is remarkable that the oxidation of Pd(110) proceeds at ~100 K lower temperatures than on Pd(111). We suggest that at the high temperature required on Pd(111) nucleation is thermodynamically controlled, and therefore, the nucleation rate decreases with temperature. On Pd(110), nucleation is predominantly kinetically controlled and thus the oxidation rate increases with temperature.