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Reactions and reaction intermediates on iron surfaces. III. Reactions of aldehydes and ketones on Fe(100)

Journal Article · · J. Catal.; (United States)
;

The reactions of formaldehyde, acetaldehyde, and acetone on Fe(100) were studied by temperature-programmed reaction spectroscopy and X-ray photoelectron spectroscopy (XPS). Formaldehyde and acetaldehyde were observed to react with adsorbed hydrogen to form adsorbed alkoxy intermediates. These reactions occurred at low temperature (ca. 200 K). In the absence of adsorbed hydrogen, formaldehyde and acetaldehyde decomposed to adsorbed CO and hydrogen. This reaction was also observed at low temperatures. On an initially clean surface the aldehydes first decomposed, forming adsorbed hydrogen which subsequently reacted with adsorbed aldehyde to form an alkoxy intermediate. The alkoxy intermediates reacted to form CO and H/sub 2/ primarily, with lesser amounts of alcohol, aldehyde, and hydrocarbon products. Acetone reacted differently from the aldehydes and did not appear to form an alkoxy intermediate. XPS results suggested that acetone and acetaldehyde did not adsorb in their keto form on the surface and it is suggested that they adsorbed as enol intermediates. The distinct reaction behavior of acetone may be due to these enol intermediates.

Research Organization:
Stanford Univ., CA
OSTI ID:
6786306
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 74:1; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACETALDEHYDE
ACETONE
ADSORPTION
ALDEHYDES
ALKOXY RADICALS
BINDING ENERGY
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FISCHER-TROPSCH SYNTHESIS
FORMALDEHYDE
INFORMATION
IONIZATION
IRON
KETONES
LOW TEMPERATURE
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
RADICALS
SORPTION
SPECTRA
SURFACE IONIZATION
TRANSITION ELEMENTS