Spin-mapping of coal structures with ESE (Electron Spin Echo) and ENDOR (Electron-Nuclear Double Resonance)
Nondestructive chemical and physical characterization of whole Illinois coal and separated macerals, both before and after treatment by various desulfurization techniques is being performed using new electron magnetic resonance methods. The chemical structures of sulfur and non-sulfur containing organic species are being measured by the technique of Hyperfine Fingerprint Spectroscopy. Data on hyperfine couplings in a separated vitrinite maceral suggest the presence of small, condensed ring aromatic species, which may be linked by aliphatic bridging groups. Results from multi-frequency EPR experiments performed at X-, Q- and W-bands show slightly anisotropic spectra which have been analyzed by theoretical techniques developed in this laboratory. Analysis of the spectra reveals a nearly axial g-matrix, which agrees well with a model of planar conjugated aromatic species. The W-band data represents the first such experiments performed on coal and separated macerals. 4 refs., 3 figs., 1 tab.
- Research Organization:
- Illinois Univ., Urbana, IL (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- FG22-88PC88921
- OSTI ID:
- 6409289
- Report Number(s):
- DOE/PC/88921-1; ON: DE91004333
- Country of Publication:
- United States
- Language:
- English
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Spin-mapping of coal structures with ESE and ENDOR
Spin-mapping of coal structures with ESE and ENDOR
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COAL
MOLECULAR STRUCTURE
MACERALS
AROMATICS
ENDOR
PROGRESS REPORT
SPECTRA
SPECTROSCOPY
VITRINITE
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
RESONANCE
010600* - Coal
Lignite
& Peat- Properties & Composition
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)