Zeolite supported iron-cobalt catalysts for the Fischer-Tropsch synthesis
A series of Fe, Co, FeCo catalysts on Y and ZSM-5 supports, prepared by impregnation and ion exchange, has been investigated. Characterization methods utilized were x-ray diffraction, H{sub 2}/CO chemisorption, Moessbauer spectroscopy, and atomic absorption. A differential reactor and as chromatographs were also employed to analyze the reaction activity and product selectivity. (i) Y supported catalysts: The oxidation, reduction, and carburization behavior of the iron-containing catalysts were observed via Moessbauer spectra. The reversibility of FeY (ion exchange) in oxidation-reduction cycles was confirmed in this experiment. Furthermore, ion exchange catalysts (FeY, FeCoY) do not show any iron metal, alloy or carbide phase after reduction or carburization. In contrast to silica supported catalysts, FeCo/HY (impregnated) reveals a Moessbauer spectra similar to Fe/HY. A 1/1 (CO/H{sub 2}) feed was used to investigate the Fischer-Tropsch reaction at 1 atm, 250{degree}C. (ii) ZSM-5 supported catalysts: Moessbauer results indicate similar patterns for impregnated and ion-exchanged catalysts, and reaction studies reveal similar catalytic behavior for the two preparation methods. This is in contrast to the rather widely different properties of these metals resulting from impregnation or ion exchange on Y zeolite. In generation, the ZSM-5 supported metals produce higher activity and selectivity for high molecular weight materials, and are particularly identified with significant aromatic content in the production distribution.
- Research Organization:
- Northwestern Univ., Evanston, IL (USA)
- OSTI ID:
- 5344841
- Country of Publication:
- United States
- Language:
- English
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ACTIVATION ENERGY
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CARBURIZATION
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COBALT
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
ENERGY
ENERGY SOURCES
FISCHER-TROPSCH SYNTHESIS
FOSSIL FUELS
FUELS
HARDENING
HYDROGENATION
IMPREGNATION
ION EXCHANGE
IRON
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REDUCTION
SCATTERING
SPECTROSCOPY
SURFACE HARDENING
SURFACE TREATMENTS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YTTRIUM