TITLE: Mechanism of Promotion of Iron Fischer-Tropsch Catalysts: Quarterly Report for Period Ending June 30, 1986.

INST.  AUTHOR: Louisville Univ. Research Foundation, Inc., KY.

SPONSOR: Department of Energy, Washington, DC.


PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1986,  6p.



The Fischer-Tropsch reaction is a complex combination of many reactions.  Among those that have been demonstrated to occur on the catalyst surface are CO dissociation, build-up of carbon chains by a polymerization process, desorption of products such as olefins and oxygen-containing compounds, water formation and its subsequent shift reaction to form CO2, olefin hydrogenation, isomerization and reincorporation in the synthesis and, probably, other reactions yet to be identified and studied. The tracer technique, involving the feeding of (14)C-labeled compounds to the synthesis, is being used here in an effort to learn how catalyst additives and supports influence these reactions and determine the final product distribution. Difficulties were encountered in our efforts to measure the amount of (14)C in the higher carbon liquid products (C6 and higher) but they have now been overcome. Only 15%, or less, of the 14 C added to the reactor during a 24 hour period was incorporated into the non-oxygenated components. Liquid chromatographic separation, following separation into alkene and alkane fractions by dry column silica gel chromatography, permitted collection of samples corresponding to each of the normal alkanes between C9 and C15 . The refractive index detector permitted quantitative determination of the amount of each n-alkane collected. The (14)C content of each n-alkane fraction was determined by liquid scintillation counting. 4 figs. (ERA citation 14:026405)