Oxidative degradation studies and modern concepts of the formation and transformation of organic constituents of coals and sedimentary rocks
To better understand the transformation of aliphatic rich materials and lignin-like polymers during catagenesis, oxidative degradation studies of lignite, subbituminous and bituminous coals were carried out using different oxidants. For comparison with coal oxidation, Green River kerogen and softwood and hardwood lignins were oxidized. In order to determine how phenolic structures in lignins and lignin-like polymers have been altered during the evolutionary stages of diagenesis, catagenesis and metagenesis, lignin or lignite coal was heated with clay minerals to produce artificial coalification products. An oxidative degradation study of these artificial coalification products provided some evidence which helps elucidate the alteration of phenolic structures during catagenesis. Conclusions from the present and previous studies are: (1) at least this lignite and subbituminous coal contain aliphatic rich materials which might have been derived from lipids. Such materials are no longer identifiable in higher rank coals except cannel coal, because of extensive degradation during catagenesis. Indeed, trapped volatile compounds extracted from bituminous coals are predominantly aliphatic hydrocarbons which are considered to be degradation products from the macromolecular materials. However, lignite and anthracite coals contain much less of these hydrocarbons. During catagenesis aliphatic carbon chains and alicyclics in kerogen are released successively forming crude oil and gas;(2) During diagenesis and early catagenesis lignin polymers are transformed to lignin-like polymers which are incorporated into the low rank coal macromolecules. At a later stage of catagenesis, these polymers have lost their lignin-like nature as a result of continued and extensive transformation.
- Research Organization:
- Argonne National Lab., IL
- OSTI ID:
- 6348927
- Report Number(s):
- CONF-810308-(Vol.3)
- Journal Information:
- Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States), Vol. 26:1; Conference: American Chemical Society symposium on the chemistry of engine combustion deposits, Atlanta, GA, USA, 29 Mar 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BITUMINOUS COAL
OXIDATION
STRUCTURAL CHEMICAL ANALYSIS
KEROGEN
LIGNIN
CATAGENESIS
LIGNITE
SUBBITUMINOUS COAL
CARBON
COALIFICATION
COPPER OXIDES
DIAGENESIS
DICARBOXYLIC ACIDS
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
HUMIC ACIDS
HYDROGEN
MASS SPECTROSCOPY
MINERALS
MONTMORILLONITE
NITROGEN
NMR SPECTRA
ORGANIC ACIDS
OXYGEN
PHENOLS
POTASSIUM PERMANGANATES
QUANTITATIVE CHEMICAL ANALYSIS
SIMULATION
SODIUM HYDROXIDES
SULFUR
ALKALI METAL COMPOUNDS
AROMATICS
BITUMINOUS MATERIALS
BLACK COAL
BROWN COAL
CARBOHYDRATES
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
CLAYS
COAL
COPPER COMPOUNDS
DATA
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MANGANESE COMPOUNDS
MATERIALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC MATTER
OXIDES
OXYGEN COMPOUNDS
PERMANGANATES
POLYSACCHARIDES
POTASSIUM COMPOUNDS
SACCHARIDES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
010600* - Coal
Lignite
& Peat- Properties & Composition