Dynamics of the fischer-tropsch synthesis over a supported cobalt catalyst

✍ Scribed by Abbas A. Khodadadi; Robert R. Hudgins; Peter L. Silveston

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 956 KB
• Volume: 76
• Category: Article
• ISSN: 0008-4034
• DOI: 10.1002/cjce.5450760211

✦ Synopsis

Step-change experiments between H,, CO, and syngas mixtures with time resolution of ca. 0.3 s were undertaken to critically test mechanisms proposed in the literature for the Fischer-Tropsch synthesis. A silica-supported cobalt catalyst was used. Results suggest C,, olefins and branched paraffins form from a carbon deposit on the catalyst surface. Two pathways appear to exist for methane formation. The first of these is from the carbon deposit through direct hydrogenation and through hydrogenolysis of the long-chain materials formed. The second pathway is hydrogenation of strongly adsorbed CO.

On a mend des experiences de changement en echelon entre des melanges d'H,, de CO et de gaz de synthese avec une resolution en temps de I'ordre de 0,3 s afin de tester de faGon critique les mecanismes proposes dans la litterature scientifique pour la syntese de Fischer-Tropsch. Un catalyser de cobalt supporte sur de la silice est employe. Les resultats suggerent que les olefines en C,, et les parafines ramifiees se forment a partir d'un dep8t de carbone a surface du catalysew. La formation du methane semble suivre deux voies: ( I ) le dep8t de carbone par hydrogenation directe et hydrogenolyse des materiaux de chaines longues formes; (2) I'hydrogenation du CO fortement adsorbe.