Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis

G. B. Raupp, W. N. Delgass

Research output: Contribution to journalArticle

195 Scopus citations

Abstract

Mössbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523 °K reveals significant differences in carbide phases formed depending on particle, support, and alloying with Ni. Small iron particles on silica favor formation of the unstable ε{lunate}′ and ε{lunate} carbides. Large iron particles on silica and small particles on magnesia form χ carbide as is normal for bulk unpromoted iron. Alloying iron with nickel in approximately equimolar amounts completely prevents formation of bulk carbides at our reaction conditions, but some evidence exists for formation of surface carbon. The complexity of the metastable Fe/FexC/C system is further exemplified in a series of spectra recorded at intermediate reaction times. These data demonstrate time dependency of carbide phases formed and dependence of the rate of carbide formation on average metal particle size.

Original languageEnglish (US)
Pages (from-to)348-360
Number of pages13
JournalJournal of Catalysis
Volume58
Issue number3
DOIs
StatePublished - Jul 1979
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Mössbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed Fischer-Tropsch synthesis'. Together they form a unique fingerprint.

  • Cite this