TITLE: Technology development for iron Fischer-Tropsch catalysts.  Quarterly technical progress report for period ending December 30, 1992.

AUTHOR: D. R. Milburn;   R. J. O'Brien;   K. Chary;   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],  1992,  11p.

NTIS ORDER NO.: DE93018918INW

ABSTRACT:

The impact on iron Fischer-Tropsch catalysts of the variables controlling the initial precipitation, subsequent aging and drying conditions have been detailed. Heat treatment of iron oxyhydroxides results in decreasing the surface area and increasing the major pore size as temperature increases, both in air and in an inert atmosphere. A shift toward higher temperature stability is seen for the same iron oxyhydroxide when co-precipitated with 6% Al(sub 2)O(sub 3), SiO(sub 2), or ZrO(sub 2).  Samples for characterization have been withdrawn from the reactor at increasing time intervals during pretreatment and exposure to synthesis gas. Surface area decrease and pore size increase are also observed during reaction pretreatment with CO at 260(degrees)C and 100 psi. and during the initial days of reaction under CO/H(sub 2). The major changes appear to occur during pretreatment and in the very early stages of the reaction.  The effects of added promoter(s) also impact the area and/or porosity of the materials. The area and pore size distributions have shown systematic changes during increasing exposure to synthesis gas.

REPORT  NUMBER: DOE/PC/90056-T10

CONTRACT  NUMBER: AC22-91PC90056