Study of Fischer-Tropsch synthesis over a silica supported iron catalyst through the use of reactive scavengers

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:6704526

Wang, C J

The synthesis of hydrocarbons from H/sub 2/ and CO was studied on a silica-supported Fe catalyst. The synthesis was carried out at 1.54 atm and 200 to 255/sup 0/C in a differential reactor. Conversion of CO never exceeded 2%. The working catalyst was achieved by transforming Fe/sub 2/O/sub 3/ into a mixture of Fe/sub 3/O/sub 4/, bulk carbides, and iron under synthesis conditions. Synthesis product distributions and the rate of methane formation are reported. Trends in CO/sub 2/ formation and the presence of cyclic hydrocarbons, saturated and unsaturated, suggest the presence of some Fe/sub 3/O/sub 4/ at the catalyst surface. Cyclohexene addition to the feed generated low concentrations of alkyl-substituted cyclohexene and cyclohexanes consistent with reported scavenging studies over Ru. Pyridine was used to scavenge C/sub 1/-C/sub 3/ alkyl species from the catalyst surface. The ..cap alpha..-alkylpyridine distributions were dependent upon synthesis variables and demonstrated dependence which was proportional to the dependence of C/sub 1/-C/sub 3/ Fischer-Tropsch products. These results confirmed that alkyl species are the immediate precursors to synthesis products. Two most probably Fischer-Tropsch mechanisms were used to describe the catalytic behavior and scavenged product distributions.

• OSTI ID: 6704526
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
HYDROGEN
IRON
METALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
SILICA
SILICON COMPOUNDS
SILICON OXIDES
TRANSITION ELEMENTS