Improvement in correlation between oil yields of oil shales and 13C n.m.r. spectra
โ Scribed by Gary E. Maciel; Victor J. Bartuska; Francis P. Miknis
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 230 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0016-2361
No coin nor oath required. For personal study only.
โฆ Synopsis
elevating control of emitter heating current ranging at least from 6 to 12 mA was found to be essential. In conclusion, a combination of emitter heating current control and the accumulation of ions on a photographic plate or through a computer will be indispensable in the measurement of mixtures. The FD mass spectra of oil were characterized by numerous peaks, and the outstanding peaks appeared at m/e 14 intervals regularly in the range of m/e 338-478.
Thus, FD mass spectrometry may be expected to give in-teresting results for the elucidation of features of the mixture.
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## 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
A number of samples of shale oil prepared under various conditions have been examined by 13C n.m.r. using multiple-pulse techniques that allow carbon-type assignments. Previous assignments by Netzel et a/. (Fuel 1981,60,307) are confirmed and several new ones made. Product chemistry is then examined
A method for estimation of aromatic content in oil shales is demonstrated. Magic-angle spinning at 2 kHz is shown to remove chemical shift anisotropy to a sufficient degree to resolve aromatic and aliphatic 13C n.m.r. spectral regions for a lithic oil shale specimen. The proton and carbon n.m.r. rel