Low temperature water-gas shift reaction over alkali metal promoted cobalt carbide catalysts

Muthu Kumaran Gnanamani, Gary Jacobs, Wilson D. Shafer, Dennis E. Sparks, Shelley Hopps, Gerald A. Thomas, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Low temperature water-gas shift (LT-WGS) was performed over various group I alkali metal (Li, Na, K, Rb, Cs) promoted cobalt carbide (Co2C) catalysts at temperatures ranging from 453 to 573 K and atmospheric pressure. Cobalt carbide (Co2C) was found to be active for the WGS reaction. The stability of the catalyst is related to the stability of the cobalt carbide phases under reaction conditions. Potassium promoted cobalt carbide catalysts exhibited higher activity and stability compared to the other alkali promoted catalysts for LT-WGS. X-ray diffraction analyses of fresh and used catalysts suggest that the origin of deactivation of the catalysts is primarily due to the chemical transition of cobalt from carbide to metal during WGS.

Original languageEnglish
Pages (from-to)612-618
Number of pages7
JournalTopics in Catalysis
Volume57
Issue number6-9
DOIs
StatePublished - Apr 2014

Keywords

  • Alkali promoter
  • Catalyst stability
  • Cobalt carbide
  • Low temperature water-gas shift
  • X-ray diffraction

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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