B. Trzebicka et al., BL-NMR INVESTIGATIONS OF BITUMINOUS COAL AND ITS MACERALS, Erdol und Kohle, Erdgas, Petrochemie vereinigt mit Brennstoff-Chemie, 46(5), 1993, pp. 190-192
Polish bituminous coaql of 85.6 % carbon content and maceral concentra
tes - exinite, vitrinite and inertinite - separated from this coal wer
e studied by broad-line nuclear magnetic resonance between 20-degrees-
C and 190-degrees-C. The recorded spectra exhibited above 110-degrees-
C a complex structure. They were separated into two components. The te
mperature dependence of the second moment, the linewidth and the fract
ions of individual lines in the spectra allows to conclude about the a
ctivation of the fast movement of a part of protons in studied samples
. In connection with known models of coal morphology it is possible to
correlate these proton groups with structural elements of coal.