Changes in molecular accessibility in APCS coal oxidized in the presence of sunlight

Journal Article · Tue Dec 31 04:00:00 EST 1996 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry

OSTI ID:420559

Ding, R; Kispert, L D; Jeevarajan, A S ^[1]

---

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

Weathering changes the properties of coal and its utilization through oxidative and moisture loss processes. Using an EPR-spin probe method, it has been shown that the regions in Illinois No. 6 coal accessible to spin probes upon 0-alkylation increase if the coal is first exposed to sunlight in air rather than to air in the absence of sunlight. Analysis reveals that an increase in oxidation products and microporosity has occurred. One plausible cause for the increase is the formation and reaction of singlet oxygen. A study of Pocahontas No. 3, Lewiston-Stockton and Wyodak-Anderson coal in which the oxygen content varies from 2% to 17% shows that the accessibility of spin probes in toluene swelled oxidized coal depends also on the percent oxygen present and time of exposure to sunlight.

• OSTI ID: 420559
• Report Number(s): CONF-960807--
• 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. 41; ISSN 0569-3772; ISSN ACFPAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
MOISTURE
OXIDATION
PORE STRUCTURE
SWELLING
VISIBLE RADIATION
WEATHERING