Very high frequency EPR of sulfur compounds in coal
- Univ. of Illinois, Urbana, IL (United States); and others
The overall goal of our work during the last five years has been the non-destructive elucidation of molecular structure in coal. Special emphasis has been placed on determining the concentration and molecular forms of organic sulfur in coal. Our approach has been to use the naturally occurring impaired electrons in coal as reporters of their environment, making use of electron magnetic resonance (EMR) spectroscopy to develop a detailed picture of the types and arrangements of atoms {open_quotes}seen{close_quotes} by the electrons. With a 95 GHz spectrometer, we showed that the aromatic sulfur in coal produced a unique EMR signature. Extensive experimental and theoretical work on model aromatic sulfur compounds in the thiophene series has enabled us to develop a detailed understanding of the relationships between the structure of these compounds and their EMR spectra. We developed an automated computer program which ran analyze the EMR spectra and which reports the aromatic sulfur content of the coal as well as key spectral parameters. This analysis method has been tested on coal blends of know sulfur content as well as on a variety of coals from the IBCSP and elsewhere. The precision of the method is conservatively {plus_minus}0.1% of the aromatic sulfur in the sample. Identical samples measured both by EMR and XANES gave nearly identical results.
- OSTI ID:
- 214693
- Report Number(s):
- CONF-950801-; TRN: 96:000922-0164
- Resource Relation:
- Conference: 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of 210th ACS national meeting. Part 1 and 2; PB: 1866 p.
- Country of Publication:
- United States
- Language:
- English
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