13C solid-state n.m.r, spectra of samples of 14 coals and their pyridine residues representative of the three depositions in the Shanxi province of the People's Republic of China are described in detail. The results confirm those of previous infrared spectroscopy in showing these vitrinite-inertinit
Solid state 13C n.m.r. dipolar dephasing study of Canadian coals
โ Scribed by Y. Theriault; D.E. Axelson
- Book ID
- 107756254
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 665 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0016-2361
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The quantitative aspects of cross-polarization (CP), which is used in conjunction with dipolar decoupling and magic-angle rotation to obtain high resolution 13C n.m.r. spectra of coals, have been studied using a bituminous coal (82 wt% C, dmmf basis) and asphaltenes from an extract of the same coal.
Three Polish coal samples (flame coal, gas coal and orthocoking coal) and their macerals were studied in the solid state by means of 13C cross polarization/magic angle spinning n.m.r. and FT-i.r. spectroscopies. Several structural parameters derived from these analyses allow the characterization of