Table 4.
Atomic concentrations (%) of (a) oxygen forms, (b) nitrogen forms, (c) carbon forms, and (d) sulfur forms obtained by the fitting results of the O1s, N1s, C1s, and S2p spectra, respectively, for n-C7 asphaltenes and resins II.
| Sample | Peak | |||||||
|---|---|---|---|---|---|---|---|---|
| C1s | O1s | S2p | N1s | |||||
| Assignment | % | Assignment | % | Assignment | % | Assignment | % | |
| n-C7 Asphaltene | C–C, C–H | 77.4 | C–O–C, C–O | 76.4 | Thioether | 23.4 | Pyridines | 40.3 |
| C=O | 18.0 | COO– | 23.6 | Thiophene | 74.8 | Pyrrolic | 32.5 | |
| COO– | 4.6 | Sulfones | 1.8 | Amines | 27.3 | |||
| Resin II | C–C, C-H | 76.3 | C-O–C, C–O | 73.2 | Thioether | 49.5 | Pyridines | 63.1 |
| C=O | 8.6 | COO– | 26.8 | Thiophene | 25.2 | Pyrrolic | 22.6 | |
| COO– | 15.1 | Sulfones | 25.3 | Amines | 14.3 | |||