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Magnetic and Moessbauer characterization of iron/zeolite catalysts and syngas conversion studies

Thesis/Dissertation ·
OSTI ID:5713656

Bifunctional catalysts containing the medium pore (0.6 nm) zeolite and Group VIII metals, such as Fe or (Fe + Co), are of considerable interest for the conversion of syngas (synthesis gas; H/sub 2/ + CO) to gasoline range (C/sub 5/ - C/sub 11/) hydrocarbons. Various synthetic zeolites used in this study consisted of acidic zeolites, such as H-ZSM-5 and H-mordenite, and a non-acidic zeolite, namely, Silicalite. This investigation was undertaken to: 1) study the effect of the nitrate and carbonyl impregnated methods on the dispersions of Fe; 2) see if the above combinations have any marked effect on the syngas conversion; and explore if there is any metal-support interaction between the Fe clusters and the varying number of acid sites in zeolites, especially with respect to the mordenites. Iron was chosen in this study for a variety of reasons, such as its technological relevance in the commercial Fischer-Tropsch synthesis and its lower cost, as compared with the cost of other transition metals. The Fe/zeolite catalysts were characterized by in-situ magnetization, and Moessbauer techniques. IR spectroscopy was also used in investigating H-mordenites. These catalysts were also tested for their Fischer-Tropsch activity, that is, for the syngas conversion to gasoline range hydrocarbons.

OSTI ID:
5713656
Country of Publication:
United States
Language:
English

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Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
FLUIDS
FUELS
GASES
GASOLINE
HYDROCARBONS
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON
LIQUID FUELS
MATERIALS
METALS
METHANATION
MINERALS
MOESSBAUER EFFECT
MORDENITE
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
SILICATE MINERALS
SPECTRA
SYNTHESIS GAS
SYNTHETIC FUELS
TRANSITION ELEMENTS
ZEOLITES