Reaction pathway and kinetic modeling of Fischer-Tropsch synthesis over an alumina supported cobalt catalyst in supercritical-hexane

Nimir O. Elbashir, Christopher B. Roberts

Research output: Contribution to journalArticle

Abstract

A kinetic model for Fischer-Tropsch synthesis (FTS) was developed in a supercritical-hexane (SCH) environment over a commercial 15% CO/Al2O3 catalyst in a fixed-bed-reactor. The model assumed that SCH has more significant influence on the chain propagation and chain termination stages than the initial stages (adsorption of CO and H2 on the catalyst surface and chain initiation). SCH promoted in-situ extraction during FTS and provided vacant sites that promote both adsorption of CO and H2 and incorporation of alpha-olefins in the chain growth. The suggested trend in chain growth agreed well with the SCH-FTS experimental findings. The model was applicable to the following reaction conditions: synthesis gas space velocity of 93.75-281.25/hr, 230°-260deg;C, 40-65 bar, and H2/CO feed ratios of 1:1-2:1, with a hexane/synthesis gas molar ratio of 3:1/1:1. The results were compared to conventional gas phase FTS operation under the similar conditions without hexane solvent. This is an abstract of a paper presented at the 227th ACS National Meeting (Anaheim, CA 3/28/2004-4/1/2004).

Original languageEnglish
JournalACS National Meeting Book of Abstracts
Volume227
Issue number2
Publication statusPublished - 2004
Externally publishedYes

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Fischer-Tropsch synthesis
Aluminum Oxide
Hexanes
Cobalt
Hexane
Alumina
Carbon Monoxide
Catalysts
Kinetics
Synthesis gas
Adsorption
Alkenes
Olefins
Gases

ASJC Scopus subject areas

  • Chemistry(all)

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Reaction pathway and kinetic modeling of Fischer-Tropsch synthesis over an alumina supported cobalt catalyst in supercritical-hexane. / Elbashir, Nimir O.; Roberts, Christopher B.

In: ACS National Meeting Book of Abstracts, Vol. 227, No. 2, 2004.

Research output: Contribution to journalArticle

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