Hydrogenation Kinetics of Coal and Its Heavy Liquefied Products

The distribution and kinetic analysis of catalytic hydrogenation products derived from preasphaltenes (PA) were examined. A kinetic model was developed using the lump kinetic method to simulate the hydrogenation of PA catalyzed by FeS and S. The study revealed that PA is directly converted into asphaltenes (AS) and oil, followed by the further hydrocracking of AS into oil and gas products. At higher temperatures, there is a noticeable regression of PA to char and AS back to PA. Increased temperature and longer reaction time were found to enhance the conversion of PA and the yield of oil and gas products. Under conditions of 400°C and 60 min, the hydrogenation of PA achieved a conversion rate of 75.92% with an oil and gas yield of 32.76%. The hydrogenation conversions from the model corresponded well with experimental data, and the activation energies ranged from 67 to 224 kJ · mol–1.