Determination of the particle-size distribution of iron oxide catalysts from superparamagnetic Moessbauer relaxation spectra
- Univ. of Kentucky, Lexington, KY (United States)
Moessbauer spectroscopy has been used to investigate the particle-size distribution of a variety of ultrafine iron-based direct coal liquefaction catalysts having either Fe[sub 2]O[sub 3] or FeOOH composition. The Moessbauer spectra of these catalysts showed pronounced superparamagnetic relaxation effects. The relaxation spectra were analyzed as a function of temperature using a novel fitting model to determine the particle-size distribution for these catalysts. The resulting size distributions are in the nanometer range and agree reasonably well with size information obtained by scanning transmission electron microscopy (STEM), SQUID magnetometry, and X-ray diffraction (XRD). 32 refs., 6 figs.
- DOE Contract Number:
- FC22-90PC90029
- OSTI ID:
- 5602220
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 142:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Moessbauer studies of iron-based ultrafine coal liquefaction catalysts
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Related Subjects
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CHALCOGENIDES
COAL LIQUEFACTION
IRON COMPOUNDS
IRON OXIDES
LIQUEFACTION
MOESSBAUER EFFECT
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PEROXIDES
SIZE
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS