## Magic-angle 13C n.m.r. spectra have been obtained for a series of vitrinite concentrates. Proper modification of the cross-polarization pulse sequence allows separation of protonated and nonprotonated carbon resonances. This technique is used to determine the relative fraction of nonprotonated
Comparison of aromaticity and phenolic content as parameters for characterization of coal by 13C n.m.r. spectroscopy
β Scribed by Roger H. Newman; Murray N. Sim; James H. Johnston; John D. Collen
- Book ID
- 107756325
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 644 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0016-2361
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High-resolution gated decoupling 13C spectra of soluble materials such as coal extracts have been analysed to evaluate the carbon aromaticity if,). A correlation was found between fa and the reciprocal of the square of the shorter component in spin-spin relaxation time (Tz), which was obtained by pu
Three H-Coal liquids, ASO, ASB, and VSO, have been characterized by quantitative FT-n.m.r. spectroscopy. FT-parameters were chosen to allow determination of aromatic:aliphatic carbon ratios to within 1% and 2% error of the theoretical and the absolute number of aromatic and aliphatic carbons in a si