Fischer-Tropsch synthesis in a slurry reactor. Pretreatment effect studies

Dragomir B. Bukur, Lech Nowicki, Xiaosu Lang

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Effects of pretreatment procedures, using H2, CO, and syngas (H2/CO = 0.7) as reductants, on the performance (activity, selectivity, and stability with time) of a precipitated iron catalyst (100 Fe/5 Cu/4.2 K/16 SiO2 on a mass basis) during Fischer-Tropsch (FT) synthesis were studied in a stirred tank slurry reactor. The syngas conversion varied between 70 and 87% during the first 300 h on stream at baseline process conditions (260°C, 1.48 MPa, 1.5 L(STP)/g-cat/h, H2/ CO = 0.67), and the catalyst deactivation rate was less than 1% per day in all three tests. The catalyst selectivity did not vary markedly with time on stream. The reactor space-time-yield increased by 32-47% in all three tests, upon increasing the reaction pressure and gas space velocity to 2.17 MPa and 2.2 L(STP)/g-cat/h, respectively. The catalyst deactivation rate increased and the water-gas-shift (WGS) activity decreased during testing at the higher reaction pressure. This resulted in a slight decrease of secondary olefin hydrogenation and isomerization reactions in all three tests, and in a shift of hydrocarbon distribution toward higher molecular weight products (CO pretreated catalyst). Total olefin content decreased in the following order with the pretreatment conditions: CO > syngas > H2, whereas the olefin isomerization activity was essentially independent of the pretreatment conditions employed. Methane selectivity varied with the pretreatment conditions in the following order: CO < H2 < syngas.

Original languageEnglish
Pages (from-to)620-629
Number of pages10
JournalEnergy & Fuels
Volume9
Issue number4
Publication statusPublished - 1995
Externally publishedYes

Fingerprint

Fischer-Tropsch synthesis
Carbon Monoxide
Olefins
Catalyst deactivation
Isomerization
Alkenes
Catalysts
Water gas shift
Catalyst selectivity
Hydrogenation
Methane
Molecular weight
Hydrocarbons
Iron
Reducing Agents
Testing
Gases

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Fischer-Tropsch synthesis in a slurry reactor. Pretreatment effect studies. / Bukur, Dragomir B.; Nowicki, Lech; Lang, Xiaosu.

In: Energy & Fuels, Vol. 9, No. 4, 1995, p. 620-629.

Research output: Contribution to journalArticle

Bukur, Dragomir B. ; Nowicki, Lech ; Lang, Xiaosu. / Fischer-Tropsch synthesis in a slurry reactor. Pretreatment effect studies. In: Energy & Fuels. 1995 ; Vol. 9, No. 4. pp. 620-629.
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