Moessbauer investigation of supported Fe catalysts. III. In situ kinetics and spectroscopy during Fischer-Tropsch synthesis
In situ constant velocity Moessbauer data have been used to measure the rate of carbiding of 10Fe/SiO/sub 2/ and 10Fe/MgO during the Fischer-Tropsch synthesis reaction at 523/sup 0/K and 3.3 H/sub 2//CO. Simultaneous spectroscopic and kinetic measurements reveal the remarkable result that the reaction rate follows the extent of bulk carbide formation and, thus, that incorporation of carbon into the iron particles controls the number of active surface sites until carbiding is complete. Conversion, paraffin to olefin ratio, and C/sub 2//C/sub 1/ ratio increase with extent of carbiding. Hydrogenation of a fully carbided catalyst at 523/sup 0/K is slow and produces only methane. 6 figures, 1 table.
- Research Organization:
- Purdue Univ., West Lafayette, IN
- OSTI ID:
- 5878980
- 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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Related Subjects
400103 -- Radiometric & Radiochemical Procedures-- (-1987)
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CARBIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONVERSION
CRYOGENIC FLUIDS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
FLUIDS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN
HYDROGENATION
IRON
KINETICS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
METALS
METHANE
MOESSBAUER EFFECT
NONMETALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARAFFIN
REACTION KINETICS
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
TRANSITION ELEMENTS
WAXES