TITLE: Cobalt Fischer-Tropsch catalysts: influence of cobalt dispersion and titanium oxides promotion.

AUTHOR: H. Azib.

INST.  AUTHOR: Institut Francais du Petrole, Rueil-Malmaison;   Paris-6 Univ., 75 (France).

LANGUAGE: French

PUB.  TYPE: Technical Report

PUB.  COUNTRY: France

SOURCE: Department of Energy [DEE],  10 Apr 96,  278p.

NTIS ORDER NO.: DE96779605INW

ABSTRACT:

The aim of this work is to study the effect of Sol-Gel preparation parameters which occur in silica supported cobalt catalysts synthesis.  These catalysts are particularly used for the waxes production in natural gas processing. The solids have been characterized by several techniques: transmission electron microscopy (TEM), X-ray absorption near edge spectroscopy (XANES), programmed temperature reduction (TPR), infrared spectroscopy (IR), ultraviolet spectroscopy (UV), magnetism, and thermodesorption of H2 (TPD). The results indicate that the control of the cobalt dispersion and oxide phases nature is possible by modifying Sol-Gel parameters. The catalytic tests in Fischer-Tropsch synthesis were conducted on a pilot unit under pressure (20 atm) and suggested that turnover rates were independent of Co crystallite size, Co phases in the solids (Co deg., cobalt silicate) and titanium oxide promotion. On the other methane, the C3(+) hydrocarbon selectivity is increased with increasing crystallite size. (author). 149 refs., 102 figs., 71 tabs.

REPORT  NUMBER: IFP-42940