Aspects of the characterization of cloverite by solid-state n.m.r. techniques
✍ Scribed by Bodo Zibrowius; Michael W. Anderson; Wolfgang Schmidt; Franz-Ferdinand Schüth; Abil E. Aliev; Kenneth D.M. Harris
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 278 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0144-2449
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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
Table 1 Summary of the principal solid state i3C n.m.r. techniques
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.
## Cross -polarization and magic-angle spinning suggest that the aromatic carbons in oil shales are largely inert to thermal processes and instead are responsible for the carbonaceous residue obtained during retorting. These results are based on 13C n m.r. measurements of the organic carbon distri