skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Stanford Univ., CA
OSTI Identifier:
6810424
Resource Type:
Journal Article
Journal Name:
J. Catal.; (United States)
Additional Journal Information:
Journal Volume: 65:1
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; ETHANOL; DECOMPOSITION; FISCHER-TROPSCH SYNTHESIS; REACTION KINETICS; IRON; CATALYTIC EFFECTS; METHANOL; PROPANOLS; PHOTOELECTRON SPECTROSCOPY; REACTION INTERMEDIATES; ALCOHOLS; CHEMICAL REACTIONS; ELECTRON SPECTROSCOPY; ELEMENTS; HYDROXY COMPOUNDS; KINETICS; METALS; ORGANIC COMPOUNDS; SPECTROSCOPY; TRANSITION ELEMENTS; 090210* - Alcohol Fuels- Properties- (1976-1989)

Citation Formats

Benziger, J B, and Madix, R J. Reactions and reaction intermediates on iron surfaces. I. Methanol, ethanol, and isopropanol on Fe(100). United States: N. p., 1980. Web. doi:10.1016/0021-9517(80)90276-6.
Benziger, J B, & Madix, R J. Reactions and reaction intermediates on iron surfaces. I. Methanol, ethanol, and isopropanol on Fe(100). United States. doi:10.1016/0021-9517(80)90276-6.
Benziger, J B, and Madix, R J. Mon . "Reactions and reaction intermediates on iron surfaces. I. Methanol, ethanol, and isopropanol on Fe(100)". United States. doi:10.1016/0021-9517(80)90276-6.
@article{osti_6810424,
title = {Reactions and reaction intermediates on iron surfaces. I. Methanol, ethanol, and isopropanol on Fe(100)},
author = {Benziger, J B and Madix, R J},
abstractNote = {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.},
doi = {10.1016/0021-9517(80)90276-6},
journal = {J. Catal.; (United States)},
number = ,
volume = 65:1,
place = {United States},
year = {1980},
month = {9}
}