An EPR spin probe method for characterizing changes in the accessible regions of coal upon oxidation

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7296856

Sady, W; Kispert, L D; Spears, D R

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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90284
• OSTI ID: 7296856
• Report Number(s): CONF-920815-4; ON: DE92018529
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALKYLATED AROMATICS
AROMATICS
AZINES
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
ELECTRON SPIN RESONANCE
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LIGNITE
MAGNETIC RESONANCE
MATERIALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
POROSITY
PROBES
PYRIDINES
RESONANCE
STRUCTURAL CHEMICAL ANALYSIS
SWELLING
TOLUENE
WEATHERING