Oil characterization
The carrier gas used was hydrogen at a constant pressure of 20 psi. Injector remained in split mode with ratio of 1:50 and 240 °C. The initial temperature was 80 °C, which remained for 0.5 min and, thereafter, increased to 175 °C with rate of 15 °C min−1, and then increased to 190 °C with rate of 0.5 °C min−1 and, finally, increased with rate of 8 °C min−1 to reach 240 °C, keeping in isotherm for 15 min.