Characterization of the coal biosolubilization process using gel permeation chromatography and CPMAS NMR
Leonardite, an oxidized lignite, and Illinois {number sign}6 coal were treated with Trametes versicolor and Penicillium sp., respectively, and separately with aqueous base to yield soluble and insoluble products. The products and starting materials were analyzed by gel permeation chromatography (GPC), using both aqueous and organic eluents, and by high-field, high-speed-pinning (>10.0 kHz) {sup 13}C cross polarization/magic angle spinning (CPMAS) nuclear magnetic resonance spectroscopy (NMR). The weight average molecular weights (M{sub w}) of the fungal-and base-solubilized products determined by GPC using acidic tetrahydrofuran (THF) eluent were found to be consistently lower than the M{sub w} determined using basic aqueous eluents. The M{sub w} of the leonardite product was measured to be 1800 and 6100 daltons using the THF and aqueous eluents, respectively. The aqueous eluent (phosphate buffered at pH 11.5) was found to be superior to the THF eluent in its solubilizing power, with 10% more material analyzed with the basic eluent. The solubility of the biotreated products in aqueous base was greater than either the starting coal or the chemically solubilized product. The Trametes-solubilized leonardite was found to contain a higher percentage of aliphatic carbon than the raw lignite; the Penicillium- solubilized Illinois {number sign}6 contained more aromatic carbon than before fungal treatment as determined by {sup 13}C CPMAS NMR. Pre-oxidation of Illinois {number sign}6 decreases the relative amount of aliphatic carbon. The high-field, high-speed-spinning CPMAS NMR technique was quantitatively evaluated using Argonne premium coals,International Humic Society Standards, and model compounds at various temperatures. 7 refs., 4 figs., 3 tabs.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5215715
- Report Number(s):
- PNL-SA-17644; CONF-900531--7; ON: DE92000798
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BIODEGRADATION
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
DECOMPOSITION
DOCUMENT TYPES
ENERGY SOURCES
EUMYCOTA
FOSSIL FUELS
FUELS
FUNGI
FURANS
GEL PERMEATION CHROMATOGRAPHY
HETEROCYCLIC COMPOUNDS
LIGNITE
MAGNETIC RESONANCE
MATERIALS
MOLECULAR WEIGHT
NUCLEAR MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
PENICILLIUM
PLANTS
PROGRESS REPORT
RESONANCE
SEPARATION PROCESSES
SOLUBILITY
SPECTRA
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TETRAHYDROFURAN