Effect of Gallium Additions on Reduction, Carburization and Fischer–Tropsch Activity of Iron Catalysts

Charles Beasley, Muthu Kumaran Gnanamani, Hussein H. Hamdeh, Michela Martinelli, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Abstract: Undoped and gallium-doped iron oxide catalysts (100Fe, 100Fe:2Ga, and 100Fe:5Ga) were prepared by following a continuous co-precipitation technique using ammonium hydroxide as precipitant. The catalysts were characterized by BET surface area, X-ray diffraction, H2-temperature programmed reduction, 57Fe Mössbauer spectroscopy, and temperature programmed decarburization techniques. The addition of gallium affects both reduction as well as carburization of iron oxide. The CO conversion decreases with an increase of gallium content relative to iron. The gallium-doped iron catalyst (100Fe:2Ga) exhibits initially a lower CO conversion after H2 activation than an undoped iron catalyst; however, the activity of the doped catalyst kept increasing with time. A strong interaction between iron oxide and gallium could explain the suppressed formation of χ-Fe5C2 and metallic iron during the carburization and reduction of iron oxide, respectively. The relative percentage of iron in χ-Fe5C2 was found to correlate with the initial rates of FT and WGS activity indicating that iron carbide is the main active component for both FT and WGS reactions. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1920-1928
Number of pages9
JournalCatalysis Letters
Volume148
Issue number7
DOIs
StatePublished - Jul 1 2018

Bibliographical note

Funding Information:
Acknowledgements This work was supported by the National Science Foundation under Grant No. 1444779 and the authors also acknowledge the financial support received from the Commonwealth of Kentucky.

Publisher Copyright:
© 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Keywords

  • Fischer–Tropsch
  • Gallium
  • Iron carbide
  • Iron oxide
  • Mössbauer spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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