Aspects of quantitative 13C n.m.r.-spectroscopy of high boiling oil residues and coal tar pitches
✍ Scribed by Herbert Dreeskamp; Thomas Potempa; Astrid Müller
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 613 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0016-2361
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The conditions necessary for the recording of quantitative 13C nuclear magnetic resonance spectra of the hexane-soluble oil separated from a coal hydrogenation product have been investigated. Measured values of T1 for different signals in the spectrum were less than 1 s, and altering the pulse-repet
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.
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