An EPR spin probe method for characterizing changes in the accessible regions of coal upon oxidation
Conference
·
OSTI ID:10172206
Eight Argonne Premium Coal Samples (APCS) were weathered in air and the structural and chemical changes that upon swelling with toluene and pyridine were, examined by an EPR spin probe method developed in this laboratory. Under mild oxidation conditions and swelling with toluene large structural changes were observed for lignite (Beulah-Zap) which suggested the collapse of the coal structure. This did not occur for higher rank coal. Upon oxidation and swelling with toluene and pyridine an increase occurred in the amino substituted spin probe concentration for coals with the carbon percent above 80%. A maximum was found for the creation of 5 {Angstrom} diameter pores upon swelling with pyridine at 85% C.
- Research Organization:
- Alabama Univ., University, AL (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90284
- OSTI ID:
- 10172206
- Report Number(s):
- CONF-920815--4; ON: DE92018529
- Country of Publication:
- United States
- Language:
- English
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