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C–O bond scission on "defect-rich and perfect" Pd(111)?

MPS-Authors
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Kaichev,  Vasiliy V.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21891

Morkel,  Matthias
Chemical Physics, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22189

Unterhalt,  Holger
Chemical Physics, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons32804

Rupprechter,  Günther
Chemical Physics, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21524

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

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Citation

Kaichev, V. V., Morkel, M., Unterhalt, H., Prosvirin, I. P., Bukhtiyarov, V. I., Rupprechter, G., et al. (2004). C–O bond scission on "defect-rich and perfect" Pd(111)? Surface Science, 566-568(2), 1024-1029. doi:10.1016/j.susc.2004.06.100.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0B3A-B
Abstract
To investigate the influence of surface defects on CO adsorption and dissociation, well-annealed and "defect-rich" Pd(111) were examined by sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS) within the pressure range 10_6–1 mbar. Ar+ ion sputtering was employed to produce surface defects which exhibited vibrational and photoemission characteristics different from the regular adsorption sites on Pd(111). Even under high-pressure, SFG and XPS indicated that no CO dissociation occurred on both surfaces at 300–400 K. By contrast, C–O bond scission was observed during methanol decomposition producing carbonaceous deposits beside CO and H2. A possible relationship between the adsorption geometry and C–O bond scission is discussed.