Determination of the surface reactivity of coal powders. Third quarterly report, March 1, 1983-May 31, 1983
The electrophoresis of coal powders in organic media was initiated in the previous quarter as a quick method of determining surface acidity of basicity. Initially Freon 113 was used as an inert liquid medium and pyridine was added up to 1% to act as an electron-donor to coal particles. In this period we have explored electrophoresis directly in acidic (electron-accepting) and in basic (electron-donating) liquids of our four coal samples (high and low ash anthracites and bituminous coals). The results obtained in acidic (electron-acceptor) liquids (methylene chloride, chloroform, and 1,2-dichloroethane), in basic (electron-donor) liquids (acetone, methyl isobutyl ketone, and pyridine) and lower alcohols are shown in tubular forms. Electron-donor liquids provide negative potentials to electron-accepting (acidic) surface sites and electron-accepting liquids provide positive potentials to electron-donor (basic) surface sites. The two anthracite coals (PSOC 870 and 868) appear to have more surface acidity and basicity than the bituminous coals (PSOC 11 and 213), and the high basicity of the high-ash anthracite is most noteworthy. The coal suspensions with high zeta-potential do not settle out appreciably and they were found to be very rapidly electro-deposited. 5 figures. 2 tables.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (USA). Dept. of Chemistry
- DOE Contract Number:
- FG22-82PC50809
- OSTI ID:
- 5859148
- Report Number(s):
- DOE/PC/50809-T2; ON: DE83015896
- Country of Publication:
- United States
- Language:
- English
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Methods for characterizing the acidic and basic surface sites of coal
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Related Subjects
COAL FINES
ELECTROPHORESIS
SURFACE PROPERTIES
ACETONE
ANTHRACITE
BASES
BITUMINOUS COAL
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPARATIVE EVALUATIONS
ETHANOL
EXPERIMENTAL DATA
KETONES
METHANOL
ORGANIC ACIDS
PROPANOLS
PYRIDINE
RESEARCH PROGRAMS
ALCOHOLS
AZINES
BLACK COAL
CARBONACEOUS MATERIALS
COAL
DATA
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
MATERIALS
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
010600* - Coal
Lignite
& Peat- Properties & Composition