Hydrogenation of carbon dioxide over iron carbide prepared from alkali metal promoted iron oxalate

Muthu Kumaran Gnanamani, Hussein H. Hamdeh, Wilson D. Shafer, Shelley D. Hopps, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Iron carbide was prepared by the carburization of iron oxalate doped with various alkali metals in flowing CO at 400 °C. The addition of alkali metal (Li, Na, K, Rb or Cs) to iron oxalate was found to decrease the bulk iron carbides formation. However, the amount of carbon deposited on Fe as inferred from temperature programmed hydrogenation and high-resolution transmission electron microscopic studies show an increasing trend with the increase of the basicity of alkali added. The CO2 and H2 conversions of all alkali doped iron catalysts were initially higher but they declined over time irrespective of alkali. The benefits of addition of alkali to iron without any structural and reduction promoters, such as copper, is found to lower the selectivity for methane, higher olefins and oxygenates formation for CO2 hydrogenation.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalApplied Catalysis A: General
Volume564
DOIs
StatePublished - Aug 25 2018

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support of this work by the Commonwealth of Kentucky . We would like to thank Dr. Dali Qian, CAER, University of Kentucky for assisting with TEM analyses.

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Alkali metal
  • Carbon dioxide
  • Hydrogenation
  • Iron carbide
  • Iron oxalate

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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