EELS spectra of methylene and ketene on Fe(110)

The EELS spectrum of methylene, in the presence of co-adsorbed oxygen and carbon, was obtained through the decomposition of ketene on Fe(110). The adsorbed CH 2 species is bridge bonded and remains on the surface to ~ 520 K. In the 400–500 K temperature range changes in the EELS spectra are noted. I...

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Bibliographic Details
Published inSurface science Vol. 148; no. 2; pp. 292 - 310
Main Authors McBreen, P.H., Erley, W., Ibach, H.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.01.1984
Amsterdam Elsevier Science
New York, NY
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
Chemisorption
Catalytic reaction
Hydrocarbon
Aliphatic compound
Organic adsorbate
Saturated compound
Crystal face
Iron
Transition metal
Metal
Experimental study
Electron energy loss spectrum
Gas solid adsorption
Gas solid interface
Metallic adsorbent
Fischer Tropsch catalyst
Chemical decomposition
Ethylenic compound
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Summary:The EELS spectrum of methylene, in the presence of co-adsorbed oxygen and carbon, was obtained through the decomposition of ketene on Fe(110). The adsorbed CH 2 species is bridge bonded and remains on the surface to ~ 520 K. In the 400–500 K temperature range changes in the EELS spectra are noted. It is argued that these changes are due to the formation of an unstable surface vinylidene species through the reaction of CH 2 with surface carbon. Results for the adsorption of ketene on Fe(110) and for ketene and diazomethane on polycrystalline iron are presented and discussed. The EELS results are compared with literature data for in-situ IR studies of Fischer-Tropsch catalysts.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(84)90583-1