Fischer Tropsch synthesis: Deuterium isotopic study for the formation of oxygenates over CeO 2 supported Pt-Co catalysts

Muthu Kumaran Gnanamani, Gary Jacobs, Wilson D. Shafer, Mauro C. Ribeiro, Venkat Ramana Rao Pendyala, Wenping Ma, Burtron H. Davis

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The effect of deuterium on Fischer-Tropsch (FT) synthesis was investigated over a Pt promoted Co/CeO 2 catalyst. CeO 2 supported Pt-Co catalyst is more selective towards methane and oxygenates. H 2-D 2-H 2 switching experiments suggest that the hydrogenation of CO is involved in the rate determining step (inverse isotope effect). The suppression of oxygenate formation with deuterium leads to the conclusion that common FT intermediates are responsible for the observed shift in the product spectrum. The deuterium isotopic study supports our previously proposed mechanism for the formation of alcohols in that the Co-CeO 2 interface is involved in the catalysis, such that termination of chain growth occurs at the metal-oxide junction and involves bridging OH groups on partially reduced ceria.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalCatalysis Communications
Volume25
DOIs
StatePublished - Aug 5 2012

Keywords

  • Ceria
  • Cobalt catalyst
  • Deuterium isotope effect
  • Fischer-Tropsch synthesis
  • Oxygenates

ASJC Scopus subject areas

  • Catalysis
  • Chemistry (all)
  • Process Chemistry and Technology

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