Thermogravimetric properties and H/C, O/C and H/O ratios for coals of several ranks

Conference · Tue Jan 01 04:00:00 EST 1985 · Geol. Soc. Am., Abstr. Programs; (United States)

OSTI ID:6198535

Kopp, O C; Harris, L A

Initial volatilization temperatures (IVT) and average voltilization rates (AVR) have been determined for thirty-six coals ranging from lignite to low-volatile bituminous. The relationship between rank, thermal behavior and chemical ratios has been investigated. For example, when IVT is plotted against O/C, IVT's increase rapidly while the O/C ratio decreases from 0.24 to 0.14 for lignites and sub-bituminous coals. In the high-volatile bituminous rank, IVT's hover near 360/sup 0/C while the O/C ratio decreases rapidly form 0.15 to 0.04. In the medium- and low-volatile bituminous ranks IVT's again increase rapidly while the O/C ratio decreases only slightly from 0.04 to 0.02. When IVT's are compared with H/C ratios, the ratios decrease gradually for lignites and sub-bituminous coals and from 0.72 to 0.61 for medium- and low-volatile bituminous coals. During the major transition between sub-bituminous and high-volatile bituminous coals the H/C ratio falls in the overlapping range from 0.88 to 0.75. The authors conclude that during the early coalification little oxygen is lost while the H/C ratio decreases through the loss of methane. During the transition from sub-bituminous to high-volatile bituminous, oxygen is lost more rapidly while hydrogen remains in the coal to produce new organic compounds which give high-volatile bituminous coal its unique properties.

• Research Organization: Univ. of Tennessee, Knoxville (USA)
• OSTI ID: 6198535
• Report Number(s): CONF-8510489-
• Conference Information: Journal Name: Geol. Soc. Am., Abstr. Programs; (United States) Journal Volume: 17
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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& Peat-- Properties & Composition
58 GEOSCIENCES
580400 -- Geochemistry-- (-1989)
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMISTRY
COAL
COAL RANK
COALIFICATION
COMBUSTION KINETICS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOCHEMISTRY
KINETICS
MATERIALS
PHYSICAL PROPERTIES
REACTION KINETICS
THERMODYNAMIC PROPERTIES