Actions for Study of Fischer-Tropsch synthesis through the use of surface intermediate scavengers. Progress report, August 1, 1982-April 1, 1983

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Study of Fischer-Tropsch synthesis through the use of surface intermediate scavengers. Progress report, August 1, 1982-April 1, 1983

Author
Ekerdt, J. G.
Published
United States : [publisher not identified], 1983
Springfield, Va.: National Technical Information Service, [approximately 1983]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
The primary goal of the research is to identify the reaction pathways by which synthesis gas is converted into hydrocarbons. These mechanisms are needed to understand the fundamental causes for selectivity and to develop more selective catalysts from first principles. The actual effort was directed toward studies of Fischer-Tropsch synthesis over Fe/SiO/sub 2/ and isosynthesis catalytic chemistry over ZrO/sub 2/. Fischer-Tropsch synthesis studies concentrated upon the propagation reaction and the role alkyl species have in propagation and termination. Alkyl species concentrations were inferred by scavenging the alkyl species off the surface during Fischer-Tropsch synthesis. Pyridine was used as the scavenger and C/sub 1/-C/sub 4/-..cap alpha..-Alkylpyridines were formed. The distributions of the alkylpyridines were studied as a function of the synthesis conditions. These studies established that alkyl fragments are the precursor to gas phase products and that alkyl fragments are participating in the propagation reaction. The details of the propagation reaction, methylene versus CO insertion, could be determined. Isosynthesis studies concentrated upon the reaction pathway to iso-C/sub 4/ products and the initiation of the reaction. Rate measurements at 37 atm suggest that isobutene is formed in a stepwise process between a C/sub 3/ carbenium ion and a C/sub 1/ oxygenaged species. Studies at 1 atm suggest that CO adsorbs and interacts with surface hydroxyl groups to form formates, carbonates and methoxides. The methoxide may be the C/sub 1/ species participating in C/sub 4/ formation. 9 figures, 6 tables.
Report Numbers
DE83010339; DOE/ER/10720-6
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AS05-80ER10720
OSTI Identifier 6466789
Research organization: Texas Univ., Austin (USA).
View MARC record | catkey: 47330863