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Analysis and evolution of coals: UV fluorescence spectroscopy study (demineralized coals-oxidized coals)

✍ Scribed by Gilbert Mille; Michel Guiliano; Jacky Kister

Book ID
116094034
Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
420 KB
Volume
13
Category
Article
ISSN
0146-6380

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## Magic-angle 13C n.m.r. spectra have been obtained for a series of vitrinite concentrates. Proper modification of the cross-polarization pulse sequence allows separation of protonated and nonprotonated carbon resonances. This technique is used to determine the relative fraction of nonprotonated