Insights into the catalytic performance of mesoporous h-zsm-5-supported cobalt in fischer-tropsch synthesis

Sina Sartipi*, Margje Alberts, Vera P. Santos, Maxim Nasalevich, Jorge Gascon Sabate, Freek Kapteijn

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Mesoporous H-ZSM-5 (mesoH-ZSM-5) was used as a carrier for a series of bifunctional Co-based catalysts for Fischer-Tropsch synthesis with ZrO 2 and/or Ru added as promoters. The reducibility of the catalysts was studied in detail by using temperature-programmed reduction and X-ray absorption spectroscopy. A comparison of the catalytic performance of Co/mesoH-ZSM-5 and Co/SiO2 (a conventional catalyst), after 140 h on stream, reveals that the former is two times more active and three times more selective to the C5-C11 fraction with a large content of unsaturated hydrocarbons, which is next to α-olefins. The acid-catalyzed conversion of n-hexane and 1-hexene, as model reactions, demonstrates that the improvement in the selectivity toward gasoline range hydrocarbons is due to the acid-catalyzed reactions of the Fischer-Tropsch α-olefins over the acidic zeolite. The formation of methane over the zeolite-supported Co catalysts originates from direct CO hydrogenation and hydrocarbon hydrogenolysis on coordinatively unsaturated Co sites, which are stabilized as a consequence of a strong metal-zeolite interaction. Although the addition of either ZrO2 or Ru increases the catalyst reducibility considerably, it does not affect the product selectivity significantly.

Original languageEnglish (US)
Pages (from-to)142-151
Number of pages10
JournalChemCatChem
Volume6
Issue number1
DOIs
StatePublished - Jan 1 2014

Keywords

  • Fischer-Tropsch synthesis
  • alkenes
  • cobalt
  • mesoporous materials
  • zeolites

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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