High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface

Figure 2

(a) conventional X-band EPR spectra of oil, resins, and asphaltenes and deposited on alumina surface asphaltenes (sample Q10) at room temperature. The signal belonging to FR is marked. Other EPR components originate from VP complexes. (b) example of the experimental (black solid line) asphaltene EPR spectrum fitting (red dashed line) in the EasySpin package for MatLab [59] with the parameters given in Table 2.

(a)

(b)