Structure analysis of coals by resolution enhanced solid state 13C n.m.r. spectroscopy

The application of experimental n.m.r. and chemical resolution enhancement techniques in cross-polarization/magic angle spinning (CP/MAS) 13C-n.m.r. spectroscopy yields spectra of coals and coalderived solids which contain structural information within the hybridization resonance envelopes. The sp 2...

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Bibliographic Details
Published in:Fuel (Guildford) 1982, Vol.61 (1), p.53-57
Main Authors: Hagaman, Edward W., Woody, Madge C.
Format: Article
Language:English
Subjects:
alkylation
bituminous coal
instrumental methods of analysis
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Summary:The application of experimental n.m.r. and chemical resolution enhancement techniques in cross-polarization/magic angle spinning (CP/MAS) 13C-n.m.r. spectroscopy yields spectra of coals and coalderived solids which contain structural information within the hybridization resonance envelopes. The sp 2 - and sp 3 -carbon resonance manifolds are partitioned into components arising from carbon centres bonded directly to oxygen, hydrogen and only other carbon atoms. The unique, observable chemical shift bands in the spectrum are increased from three (the relative areas of the sp 2 - and sp 3 -carbon resonance envelopes and a separate carbonyl band) to nine. This resolution permits the principal structural changes in chemically-modified coals to be mapped in unprecedented detail. The reductive alkylation of a typical bituminous coal has been examined by this method.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(82)90292-7