Catalyst study for coal tar hydrocracking in supercritical gasoline

The effects of preparing conditions of Co-Mo-Pd-Y catalyst series on the light oil yield were investigated in order to improve the light oil yield of coal tar hydrocracking of supercritical gasoline. The effect factors to light oil yield were studied, such as atom ratio (mole ratio) of Co to (Co+Mo), catalyst calcination temperature, acid solution concentration dealing with Y zeolite, temperature of acid solution, and time of Y zeolite dipping in acid solution, to obtain higher light oil yield. The results show that the light oil yield can reach 81.5% (mass fraction) when the atom ratio of Co to (Co+Mo) is 0.5, catalyst calcination temperature is 550°C, acid solution concentration is 2 mol/L, temperature of acid solution is 70°C, and time of Y zeolite dipping in acid solution is 4 h. The Co-Mo-Pd-Y catalyst prepared under the optimal operating conditions was characterized by means of N₂ adsorption isotherm and XRD. The catalyst prepared shows that high activity and higher light oil yield are obtained.