Electron paramagnetic resonance and electron spin-echo spectroscopy of Argonne Premium coals
Conference
·
OSTI ID:441423
- Exxon Research and Engineering Company, Annandale, NJ (United States)
The series of Argonne Premium coals was examined by using electron paramagnetic resonance (EPR) and electron spin-echo (ESE) techniques. EPR measurements indicate the presence of both carbon radical species and transition metal ions, principally iron and manganese, in the samples. The carbon radical densities and the ease of saturation of the radical signal do not increase with increasing coal rank, as was observed in previous studies of demineralized, isolated coal macerals. ESE techniques discriminate between the narrow (inertinitic) and broad (vitrinitic) components of the carbon radical signal, and the line widths and relaxation rates have been determined for both components. Instantaneous diffusion was observed for all bituminous coals but not for the lignite coal. The data suggest that transition metal species significantly affect the carbon radical resonance properties of these coals. 12 refs., 8 figs., 5 tabs.
- OSTI ID:
- 441423
- Report Number(s):
- CONF-891206--
- Country of Publication:
- United States
- Language:
- English
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