Effects of organic solvents on the EPR spectrum of coal
S Duber, AB Wiȩcckowski - Fuel, 1984 - Elsevier
Fuel, 1984•Elsevier
EPR studies have been carried out on coal and the products of its extraction with
ethylenediamine, pyridine and tetrahydrofuran. The spectrum of the coal and the residue
after extraction consisted of two lines. In the case of the extraction residue the width of the
narrow line remains practically unchanged compared to the initial coal whereas that of the
broad component decreases. The extracts exhibit a single line with a width close to that of
the broad component from the extraction residue. The concentration of paramagnetic …
ethylenediamine, pyridine and tetrahydrofuran. The spectrum of the coal and the residue
after extraction consisted of two lines. In the case of the extraction residue the width of the
narrow line remains practically unchanged compared to the initial coal whereas that of the
broad component decreases. The extracts exhibit a single line with a width close to that of
the broad component from the extraction residue. The concentration of paramagnetic …
EPR studies have been carried out on coal and the products of its extraction with ethylenediamine, pyridine and tetrahydrofuran. The spectrum of the coal and the residue after extraction consisted of two lines. In the case of the extraction residue the width of the narrow line remains practically unchanged compared to the initial coal whereas that of the broad component decreases. The extracts exhibit a single line with a width close to that of the broad component from the extraction residue. The concentration of paramagnetic centres in the residue and extracts is lower than in the coal. The decrease in concentration is higher when the extraction yield obtained with the solvent is higher. Quenching of paramagnetic centres is found to be related to the destruction of intermolecular bonds of the donor-acceptor type in the coal.
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