Molecular structure of bituminous coal studied with pulse nuclear magnetic resonance

High-volatile bituminous coal and coal saturated with fully deuterated solvents, were studied using the 1H n.m.r. pulse technique. Free-induction decay (FID) signals were separated into Gaussian and Lorentzian components and contents of immobile and mobile phases of coal matter were calculated. Spin...

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Bibliographic Details
Published in:Fuel (Guildford) 1982-01, Vol.61 (7), p.647-650
Main Authors: Jurkiewicz, Antoni, Marzec, Anna, Piślewski, Narcyz
Format: Article
Language:English
Subjects:
bituminous coal
instrumental methods of analysis
molecular structure
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Summary:High-volatile bituminous coal and coal saturated with fully deuterated solvents, were studied using the 1H n.m.r. pulse technique. Free-induction decay (FID) signals were separated into Gaussian and Lorentzian components and contents of immobile and mobile phases of coal matter were calculated. Spin-spin relaxation times, T 2, for both phases were determined. Some solvents caused a significant decrease in the content of the coal immobile phase. It is concluded that the immobile phase of coal consists of macromolecules and molecules. The latter are attached to macromolecules by electrondonor-acceptor interactions which can be destroyed by some solvents. The contents of macromolecules (60 wt%) and molecules (40 wt%) in the coal were determined.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(82)90011-4