New NiMo/Al2O3 Catalysts for Hydrodearomatization of Secondary Middle Distillates

For secondary middle distillates hydrodearomatization, NiMo/Al 2 O 3 c catalysts with different surface loading of molybdenum were synthesized and studied. The feed used was a mixture of secondary middle-distillate gasoils, consisting of 85% vol. light catalytic cracking gasoil and 15% vol. delayed coking light gasoil. The catalytic properties of the prepared samples were defined in the temperature range of 340–380°C, at a total pressure of 10 MPa. An increase in the Mo load from 2.0 to 5.7 at/nm leads to a 1.5-fold decrease in the dispersion of the active phase particles, and so the catalytic properties change significantly. The hydrogenation and hydrodesulfurization rates over the synthesized catalysts decrease in the series 6-NiMo/Al 2 O 3 > 4-NiMo/Al 2 O 3 > 2-NiMo/Al 2 O 3 , symbate to the mass fraction of active metals. At the same time, the catalyst with a Mo loading of 4.4 at/nm demonstrated the maximum specific depth of hydrogenation.