TITLE: Mechanism of Promotion of Iron Fischer-Tropsch Catalysts: Final Report.

AUTHOR: L. M. Tau;   H. Dabbagh;   B. Chawla;   B. H. Davis.

INST.  AUTHOR: Kentucky Univ., Lexington. Center for Applied Energy Research.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  31 Dec 87,  185p.

NTIS ORDER NO.: DE89009555/INW

ABSTRACT:

The kinetic isotope method (KIM) has been utilized in a study designed to determine the way in which promoters for iron catalysts impact the variety of primary and secondary reactions in the Fischer-Tropsch synthesis (FTS).  The KIM involves the addition of known or suspected intermediates to the synthesis gas feed. In order to follow the conversion of the added compound, and the products formed as a result of the addition, the added compound is labeled with a radioactive isotope of carbon. An analysis of the Fischer-Tropsch synthesis products readily permits one to identify those compounds that are derived from the added compound. Using this technique, results were obtained with unpromoted iron, iron promoted by Al2 O3, ThO2, ZrO2, and SiO2 , and alkali promoted iron catalysts. A combination of gas chromatographic, dry column chromatographic and liquid chromatographic techniques allowed us to determine the 14 C present in compounds over the C1 --C22 range in the alkane and alkene fractions. A continuous stirred tank reactor (CSTR) was used for most of the experimental studies. 108 refs., 100 figs., 6 tabs. (ERA citation14:024248)

REPORT  NUMBER: DOE/PC/70029-T1

CONTRACT  NUMBER: AC22-84PC70029