Research Article
Potential of NMR Spectroscopy in the Characterization of Nonconventional Oils
Table 3
Percentage distribution of carbon based on 13C NMR data for char and bio-oil sample 1.
| | 13C Chemical shift range (ppm) | Assignments | % Distribution | | Pentane | Methanol | Ethyl acetate | CH2CH2 | Toluene | Char |
| | 0–60 | Aliphatics | 41 | 36 | 42 | 37 | 38 | 26 | | 60–110 | Alcohols, ethers, and carbohydrates | 47 | 49 | 47 | 41 | 40 | 27 | | 110–165 | Aromatics, olefins, and phenols | 10 | 14 | 7 | 19 | 19 | 34 | | 165–220 | Aldehydes, ketones, and acids | 2 | 1 | 4 | 3 | 3 | 13 | | 60–80 | Intact carbohydrates | 9 | 11 | 20 | 8 | 14 | 8 |
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