Steady state Fischer-Tropsch synthesis in supercritical propane

Xiaosu Lang, Aydin Akgerman, Dragomir B. Bukur

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Fischer-Tropsch synthesis (FTS) on a precipitated iron catalyst was conducted in a fixed bed reactor at baseline conditions of 1.48 MPa, 250°C, 2 L(NTP)/(h·g of cat), H2/CO = 0.67, and in supercritical propane (total pressure of 7 MPa) while keeping the synthesis partial pressure and gas flow rate constant. The catalyst activity and lumped hydrocarbon product distribution under the supercritical conditions were similar to those obtained during reaction at the baseline conditions; however, higher selectivities of 1-olefins were obtained during the supercritical phase FTS. This suggests that the rate of FTS is not diffusion limited under the reaction conditions used in this study, whereas the secondary olefin hydrogenation and isomerization reactions are diffusion limited. An independent test in which nitrogen was used instead of propane showed that operation at a total pressure of 7 MPa does not have any effect on olefin selectivity. The observed increase in olefin selectivity during the supercritical FTS is due to higher diffusivities and desorption rates of high molecular weight olefins relative to normal FTS where the catalyst pores are filled with liquid hydrocarbons (wax).

Original languageEnglish
Pages (from-to)72-77
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume34
Issue number1
Publication statusPublished - 1995
Externally publishedYes

Fingerprint

Propane
Fischer-Tropsch synthesis
propane
Alkenes
Olefins
baseline conditions
catalyst
hydrocarbon
Hydrocarbons
wax
partial pressure
gas flow
diffusivity
desorption
Catalysts
Catalyst selectivity
Waxes
iron
Carbon Monoxide
Isomerization

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

Cite this

Steady state Fischer-Tropsch synthesis in supercritical propane. / Lang, Xiaosu; Akgerman, Aydin; Bukur, Dragomir B.

In: Industrial and Engineering Chemistry Research, Vol. 34, No. 1, 1995, p. 72-77.

Research output: Contribution to journalArticle

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