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Moessbauer spectroscopic and related characterization of Fischer-Tropsch catalysts

Technical Report ·
OSTI ID:5407323

Medium pore (diameter approximately 6 angstrom) zeolites such as ZSM-5 and Silicalite impregnated with Group VIII metals provide selective catalytic pathways for the conversion of coal-derived synthesis gas to gasoline or olefins. Moessbauer and magnetic studies on these catalysts containing Fe or Fe + Co are reported. The zeolites were impregnated with metal nitrate solutions, reduced and carbided to yield the active catalyst. The freshly impregnated samples showed Fe/sup 3 +/ type spectra. The ZSM-5 (14.7% Fe) and Silicalite (13.6% Fe) samples exposed to H/sub 2/ (450/sup 0/C) showed approx. 85% reduction to the metallic state. The carbided ZSM-5 (14.7% Fe) revealed a spectrum of Hagg carbide (Fe/sub 5/C/sub 2/), an active component of the catalyst. The used catalysts showed mixtures of Hagg carbide (Fe/sub 5/C/sub 2/) and cementite (Fe/sub 3/C). It is suggested that the selectivity of ZSM-5 (5.6% Fe, 4.5% Co) resulted from Fe-Co alloy formation.

Research Organization:
Pennsylvania State Univ., University Park (USA). Dept. of Materials Science and Engineering
DOE Contract Number:
AC22-79PC10350
OSTI ID:
5407323
Report Number(s):
DOE/PC/10350-T1; ON: DE82009280
Country of Publication:
United States
Language:
English

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Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKENES
ALLOYS
CARBIDES
CARBON COMPOUNDS
CATALYSTS
CATIONS
CHARGED PARTICLES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT ALLOYS
FISCHER-TROPSCH SYNTHESIS
FLUIDS
FUELS
GASES
GASOLINE
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
IRON ALLOYS
IRON CARBIDES
IRON COMPOUNDS
LIQUID FUELS
MAGNETIC PROPERTIES
MATERIALS
MINERALS
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
SPECTROSCOPY
SYNTHESIS
SYNTHESIS GAS
TRANSITION ELEMENT COMPOUNDS
ZEOLITES