Swelling behavior of O-alkylated APCs coals as examined by the EPR spin probe method
- Univ. of Alabama, Tuscaloosa, AL (United States)
Internal hydrogen bonding, especially in the bedding planes, plays an important role in determining the swelling characteristics in variously ranked coal. To further examine the swelling behavior using the EPR spin probe technique developed in this lab, known O-alkylation procedures have been used to derivatize the hydroxyl groups in APCS coal samples. Reduction of the extent of hydrogen bonding altered the amount of polar spin probe retention. Furthermore, an increase in coal swelling by nonpolar solvents such as toluene has been observed. By swelling O-alkylated APCS coals with nonplanar as well as polar solvents, using spin probes VII and VIII has yielded the spin probe retention as a function of rank when internal hydrogen bonding due to hydroxyl groups is removed in the APCS coals Beulah-Zap, Illinois No. 6, Upper Freeport and Pittsburgh No. 8.
- OSTI ID:
- 214694
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Swelling behavior of O-alkylated APCS coals as examined by the EPR spin probe method
Molecular accessibility in solvent swelled coal