Moessbauer investigation of supported Fe and FeNi catalysts. II. Carbides formed by Fischer-Tropsch synthesis
Moessbauer characterization of iron catalysts following Fischer-Tropsch reaction at 523/sup 0/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 epsilon' and epsilon carbides. Large iron particles on silica and small particles on magnesia form chi 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/Fe/sub x/C/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. 7 figures, 6 tables.
- Research Organization:
- Purdue Univ., West Lafayette, IN
- OSTI ID:
- 5878981
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 58:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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CARBIDES
CARBON COMPOUNDS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
HIGH TEMPERATURE
IRON
MECHANICAL STRUCTURES
METALS
MINERALS
MOESSBAUER EFFECT
NICKEL
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
SUPPORTS
TRANSITION ELEMENTS
X-RAY SPECTRA