Reactions and reaction intermediates on iron surfaces. I. Methanol, ethanol, and isopropanol on Fe(100)

Journal Article · Mon Sep 01 04:00:00 UTC 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90276-6· OSTI ID:6810424

Benziger, J B; Madix, R J

The reactions of methanol, ethanol, and isopropanol on an Fe(100) surface were studied using temperature-programmed reaction spectroscopy (TPRS) and x-ray photoelectron spectroscopy (XPS). Methanol and ethanol readily formed alkoxy intermediates at or below room temperature by loss of the hydroxyl hydrogens. These alkoxys reacted above 400/sup 0/K in three ways: (1) complete decomposition to CO and hydrogen, (2) rehydrogenation to the alcohol, and (3) scission of the C-C or C-O bonds with hydrogenation of the hydrocarbon fragment. All these reactions appeared to occur simultaneously and proceeded with first-order kinetics. The first-order rate constants for reactions of the methoxy and ethoxy species were determined. Isopropanol reacted differently from either methanol or ethanol; it did not readily form a stable alkoxy intermediate. The difference in the reactions of primary and secondary alcohols was suggested to arise from steric interference of the methyl groups with the surface. These results were consistent with the results of Kummer and Emmett, which showed alcohol-related intermediates were important in Fischer-Tropsch synthesis. These observations also showed that alkoxy intermediates must be considered as possible routes in the Fischer-Tropsch synthesis.

• Research Organization: Stanford Univ., CA
• OSTI ID: 6810424
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 65:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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090210* -- Alcohol Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
ALCOHOLS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
ETHANOL
FISCHER-TROPSCH SYNTHESIS
HYDROXY COMPOUNDS
IRON
KINETICS
METALS
METHANOL
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PROPANOLS
REACTION INTERMEDIATES
REACTION KINETICS
SPECTROSCOPY
TRANSITION ELEMENTS