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

Journal Article · Sat Dec 30 23:00:00 EST 1995 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry

OSTI ID:420575

Ding, R; Tucker, D; Kispert, L D ^[1]

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1. Univ. of Alabama, Tuscaloosa, AL (United States)

Known O-alkylation procedures have been used to derivative the carboxyl and hydroxyl groups in the APCS coals Lewiston-Stockton, Wyodak-Anderson, Beulah-Zap, Illinois No. 6, Upper Freeport, and Pittsburgh No. 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.

• DOE Contract Number: FG22-93PC93202
• OSTI ID: 420575
• Report Number(s): CONF-950801--
• Journal Information: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry Journal Issue: 3 Vol. 40; ISSN 0569-3772; ISSN ACFPAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ALKYLATION
COAL
COAL RANK
ELECTRON SPIN RESONANCE
PORE STRUCTURE
PYRIDINE
SWELLING
TOLUENE