Abstract
Nine vitrinites separated from coals of various rank (69–93% carbon, daf) were studied by programmed-temperature pyrolysis. Samples were heated at 11°C/min in a stream of helium which swept the pyrolysis products into a flame-ionization detector. With the experimental system used this responds only to hydrocarbons below C 10. For all the vitrinites the curve of detector response as a function of temperature showed a single maximum and the temperature of the peak maximum was found to be located at higher temperatures for the higher-rank samples. The temperature of the peak maximum was not very sensitive to rank between 70% and about 90% carbon but varied rapidly outside this range. This suggests that the mechanism which generates low-molecular-weight hydrocarbons from coal changes above approximately 90% carbon.
Published Version
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