Comparison of aromaticity and phenolic content as parameters for characterization of coal by 13C n.m.r. spectroscopy
1988; Elsevier BV; Volume: 67; Issue: 3 Linguagem: Inglês
10.1016/0016-2361(88)90328-6
ISSN1873-7153
AutoresRoger H. Newman, Murray N. Sim, J.H. Johnston, John D. Collen,
Tópico(s)Advanced NMR Techniques and Applications
ResumoCross-polarization and magic-angle spinning techniques were used to obtain 13C n.m.r. spectra of 27 New Zealand coals sampled from drill cuttings at depths between 1.4 and 4.0 km in the Tara-1 oil exploration well, offshore south of New Zealand. Aromaticity and phenolic content were estimated from each spectrum. Of these two parameters, the phenolic content showed a stronger correlation with depth. The correlation was improved further by expressing the phenolic content as a fraction of the aromatic content. It was concluded that a combination of these parameters provides a new method for obtaining information about differences both in depositional environments and in the extent of subsequent coalification for suites of coal samples.
Referência(s)