Molecular components of coal and coal structure

Characterisation of model compounds and a synthetic coal by TG/MS/FTIR to represent the pyrolysis behaviour of coal

“…However, in the field of coal research the presence of the so-called mobile phase is generally accepted, comprising the compounds evolved at the very first stage of coal pyrolysis (<400 • C). These compounds (i.e., water and volatile organics) are due mainly to evaporation as they are not chemically bonded to the coal structure [24][25][26][27][28][29]. Bearing in mind that phenol formaldehyde resins are considered as good representatives of coal structure, the term mobile phase could also be applied to in-lab synthesised resin, which may also make a small, parallel contribution to compounds evolved at low temperatures.…”

An Essay on the Organic Geochemistry of Coal

“…497-499). Such compounds have been found in solvent extracts of a number of coals (Aczel et al, 1976;Hayatsu et al, 1978;Bodzek and Marzec, 1981). Bodzek and Marzec (1981) report the very interesting finding of indanethiol and naphthalenethiol in solvent extracts of a Carboniferous coal from Poland; one would have thought the thiol (or mercaptan) group, R-SH, too reactive to survive.…”

“…But a majority of the very large number of com pounds identified in solvent extracts are noncommittal, in that nothing about their structure compels us to believe in origins from either biological markers or network fragments (Bodzek and Marzec, 1981;Aczel et a/., 1976;Radke et al, 1982;White and Lee, 1980). But a majority of the very large number of com pounds identified in solvent extracts are noncommittal, in that nothing about their structure compels us to believe in origins from either biological markers or network fragments (Bodzek and Marzec, 1981;Aczel et a/., 1976;Radke et al, 1982;White and Lee, 1980).…”

“…In their mass spectrometric study of solvent extracts of a coal, Bodzek and Marzec (1981) obtained information about molecular weight distribu tions by field ionization mass spectrometry and found species of mass up to about 800 amu; the measuring system was capable of measuring masses at least to 1200 amu. It was observed that 20-25% of the extracts did not vola tilize in the mass spectrometer at 300°C and so this portion was of higher molecular weight: is this the colloidal material?…”

04/02222 Characterisation of model compounds and a synthetic coal by TG/MS/FTIR to represent the pyrolysis behaviour of coal

“…The first and second peaks appear at temperatures lower than 300 ºC. They therefore arise mainly from moisture, CO, and CO 2 , as can be observed in These compounds (i.e., water and volatile organics) are due mainly to evaporation as they are not chemically bonded to the coal structure [24][25][26][27][28][29]. Bearing in mind that phenol formaldehyde resins are considered as good representatives of coal structure, the term mobile phase could also be applied to in-lab synthesised resin, which may also make a small, parallel contribution to compounds evolved at low temperatures.…”