TITLE: Moessbauer spectroscopy studies of iron-catalysts used in Fischer-Tropsch (FT) processes. Quarterly technical progress report, April--June, 1994.

AUTHOR: G. P. Huffman;   K. R. P. Rao.

INST.  AUTHOR: Kentucky Univ., Lexington.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1994,  5p.

NTIS ORDER NO.: DE96000912INW

ABSTRACT:

Moessbauer spectroscopy investigations were carried out on 16 iron-based catalysts during the period under review. A set of 10 samples subjected to different pretreatments and Fischer-Tropsch synthesis were investigated to understand the effect of reduction in different gas atmospheres on the iron phases formed. Another set of 5 catalysts pretreated in CO and subjected to Fischer-Tropsch synthesis using two kinds of wax viz., (a) a low molecular wt. wax and (b) heavy wax were also studied. Although it isdifficult to draw any definite conclusions from the data, some plausible trends are noticed: (1) pretreatment of a catalyst in H(sub 2) leads to the formation of (var epsilon)-carbide; (2) pretreatment of a catalyst in H(sub 2)/CO leads to the formation of (chi)-carbide; (3) reduction of UCI-1185-149-2ND catalyst in CO leads to the formation of (chi)-carbide; and (4) reduction of DOE catalysts in CO leads to the formation of (var epsilon)-carbide. Data are presented on the phases found in the various catalysts.

REPORT  NUMBER: DOE/PC/93066-T2

CONTRACT  NUMBER: AC22-94PC93066