Abstract:

Al-MCM-41 mesoporous molecular sieves were prepared by the azeotropic distillation and ultrasonic dispersive technology using sodium silicate as silica source ，aluminum sulfate as aluminum source and cetyltrimethyl ammonium bromide as structure-directing agent. By using Al-MCM-41 as support，nickel nitrate and diammonium hydrogen phosphate as raw materials，a series of supported Ni₂P catalysts on Al-MCM-41 was prepared via the method of temperature-programmed reduction under ultrasonic oscillation. The catalysts were characterized by FTIR，BET，XRD and SEM. Hydrodesulfurization of thiophene catalyzed by Ni₂P/Al-MCM-41 was carried out in a high pressure autoclave reactor. The experimental results showed that Al-MCM-41 prepared by ultrasonic dispersive technology had a much higher specific surface area，larger pore volume and pore diameter than that prepared by conventional mechanical mixing. The Al-MCM-41 prepared by azeotropic distillation with ultrasonic dispersive technology was also better than that using only ultrasonic dispersive technology. The Ni₂P/Al-MCM-41 catalysts，hydrodesulfurization conversion of thiophene nearly reached 100% at the reaction time 5 h，reaction temperature 548 K，and reaction pressure 3.5 MPa.