Swelling behavior of O-alkylated APCS coals as examined by the EPR spin probe method

Technical Report · Sun Dec 31 04:00:00 EST 1995

DOI:https://doi.org/10.2172/206894· OSTI ID:206894

Ding, Ruisong; Tucker, D; Kispert, L D

Known O-alkylation procedures have been used to derivatize the carboxyl and hydroxyl groups in the APCS coals Lewiston-Stockton, Wyodak-Anderson, Beulah-Zap, Illinois {number_sign}6, Upper Freeport, and Pittsburgh {number_sign}8. In general the resulting decrease in hydrogen bonding reduced the cyclical variation in nitroxide spin probe retention observed for nonalkylated coals when small amounts (<1%) of pyridine are present in the toluene swelling solvent. An increase in spin probe retention by the O-alkylated coals relative to the underivatized coals indicates a more open arrangement in the coal due to a decrease in attractive forces, confirming that microporosity increases with increasing rank.

• Research Organization: Alabama Univ., University, AL (United States). Dept. of Chemistry
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-93PC93202
• OSTI ID: 206894
• Report Number(s): CONF-950801--24; ON: DE96007747
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ALKYLATION
COAL
COAL RANK
CORRELATIONS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
POROSITY
SOLVENT PROPERTIES
SWELLING
TOLUENE