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CO Oxidation Over Monolayer Manganese Oxide Films on Pt(111)

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21849

Martynova,  Yulia
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22106

Shaikhutdinov,  Shamil K.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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1841070.pdf
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Citation

Martynova, Y., Soldemo, M., Weissenrieder, J., Sachert, S., Polzin, S., Widdra, W., et al. (2013). CO Oxidation Over Monolayer Manganese Oxide Films on Pt(111). Catalysis Letters, 143(11), 1108-1115. doi:10.1007/s10562-013-1117-0.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-69C3-7
Abstract
Ultrathin manganese oxide films grown on Pt(111) were examined in the low temperature CO oxidation reaction at near atmospheric pressures. Structural characterization was performed by X-ray photoelectron spectroscopy, Auger electron spectroscopy, high-resolution electron energy loss spectroscopy, and temperature programmed desorption. The results show that the reactivity of MnOsub>x</sub> ultrathin films is governed by a weakly bonded oxygen species, which may even be formed at low oxygen pressures (~10−6 mbar). For stable catalytic performance at realistic conditions the films required highly oxidizing conditions (CO:Osub>2</sub> < 1:10), otherwise the films dewetted, ultimately resulting in the catalyst deactivation. Comparison with other thin films on Pt(111) shows, that the desorption temperature of weakly bonded oxygen species can be used as a benchmark for its activity in this reaction.