| 초록 |
Two-stage hydrotreating of two atmospheric residues (LF-AR and KEC-AR) was performed using Mo and NiMo catalysts supported on alumina. Evolution of various heteroatom classes in asphaltenes during hydrotreating process was examined, focusing on removing sulfur and nitrogen species from asphaltenes. Various heteroatom classes were analyzed by using Fourier transfer ion cyclotron mass spectrometry (FT-ICR MS) linked with atmospheric pressure photoionization (APPI). According to the changes of their relative abundances, double bond equivalent (DBE) and carbon number in the hydrotreating process, behaviors of the various heteroatom classes in the asphaltenes during hydrotreating process were interpreted. Two distinctive differences were observed for two different AR samples and qualitative evaluation was attempted for providing possible scenarios. |
