Table 1 Summary of the principal solid state i3C n.m.r. techniques
Paramagnetism and quantitation in solid state n.m.r. of coal
โ Scribed by Robert E. Botto
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 470 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
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.
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
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
The aromaticities of samples from nine Australian coal seams, including pairs of hand-picked vitrains and durains, have been determined by 13C cross-polarization n.m.r. spectroscopy with magic angle sample spinning. The results clearly show that the aromaticity (f,) of the coals increases with incre