Temperature effects on alkali-promoted CO dissociation on Ni(1 1 1)

Temperature effects on the alkali-induced CO dissociation on Ni(1 1 1) were studied by high-resolution electron energy loss spectroscopy. Measurements showed that CO adsorption on an alkali-precovered Ni(1 1 1) surface is partially dissociative in a temperature range up to 400 K and completely disso...

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Bibliographic Details
Published in:Surface science 2008-06, Vol.602 (12), p.2096-2100
Main Authors: Politano, A., Formoso, V., Chiarello, G.
Format: Article
Language:English
Subjects:
Alkali metals
Carbon monoxide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Electron energy loss spectroscopy (EELS)
Exact sciences and technology
Physics
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Summary:Temperature effects on the alkali-induced CO dissociation on Ni(1 1 1) were studied by high-resolution electron energy loss spectroscopy. Measurements showed that CO adsorption on an alkali-precovered Ni(1 1 1) surface is partially dissociative in a temperature range up to 400 K and completely dissociative for higher sample temperatures. Depending on temperature an alkali critical precoverage for CO dissociation was found to exist, in agreement with theoretical calculations. Moreover, loss measurements demonstrated that Na and CO desorption are non-concurrent, in contrast with results obtained using thermal desorption spectroscopy for similar systems.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2008.04.015