You need JavaScript to view this

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

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, thermodesorption of H{sub 2} (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 C{sub 3}{sup +} hydrocarbon selectivity is increased with increasing crystallite size. Inversely, the methane production is favoured by very small crystallites, cobalt silicate increase and titanium addition. However, the latter, used as a cobalt promoter, has a benefic effect on the active phase stability during the synthesis. (author). 149 refs., 102 figs., 71 tabs.
Authors:
Publication Date:
Apr 10, 1996
Product Type:
Thesis/Dissertation
Report Number:
IFP-42940
Reference Number:
SCA: 030300; PA: FRC-96:003276; EDB-96:133889; NTS-97:002298; SN: 96001650852
Resource Relation:
Other Information: TH: These (D. es Sc.); PBD: 10 Apr 1996
Subject:
03 NATURAL GAS; FISCHER-TROPSCH SYNTHESIS; WAXES; PRODUCTION; SOL-GEL PROCESS; COBALT; TRANSMISSION ELECTRON MICROSCOPY; INFRARED SPECTRA; ULTRAVIOLET SPECTRA; MAGNETISM; DISPERSIONS; NATURAL GAS; HETEROGENEOUS CATALYSIS; TITANIUM OXIDES; CATALYST SUPPORTS; IMPREGNATION; X-RAY DIFFRACTION; REDUCTION; COBALT OXIDES; X-RAY SPECTROSCOPY; METHANE; HYDROGEN
OSTI ID:
288105
Research Organizations:
Institut Francais du Petrole (IFP), 92 - Rueil-Malmaison (France); Ecole Nationale Superieure du Petrole et des Moteurs (ENSPM), 92 - Rueil-Malmaison (France); Paris-6 Univ., 75 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE96779605; TRN: FR9603276
Availability:
OSTI as DE96779605
Submitting Site:
FR
Size:
278 p.
Announcement Date:

Citation Formats

Azib, H. Cobalt Fischer-Tropsch catalysts: influence of cobalt dispersion and titanium oxides promotion. France: N. p., 1996. Web.
Azib, H. Cobalt Fischer-Tropsch catalysts: influence of cobalt dispersion and titanium oxides promotion. France.
Azib, H. 1996. "Cobalt Fischer-Tropsch catalysts: influence of cobalt dispersion and titanium oxides promotion." France.
@misc{etde_288105,
title = {Cobalt Fischer-Tropsch catalysts: influence of cobalt dispersion and titanium oxides promotion}
author = {Azib, H}
abstractNote = {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, thermodesorption of H{sub 2} (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 C{sub 3}{sup +} hydrocarbon selectivity is increased with increasing crystallite size. Inversely, the methane production is favoured by very small crystallites, cobalt silicate increase and titanium addition. However, the latter, used as a cobalt promoter, has a benefic effect on the active phase stability during the synthesis. (author). 149 refs., 102 figs., 71 tabs.}
place = {France}
year = {1996}
month = {Apr}
}