The invention discloses a startup sulfurization method for a
trickle bed class-II
active center hydrogenation catalyst, which comprises the following steps: (1) preparing a class-II
active center hydrogenation catalyst; (2) filling the class-II
active center hydrogenation catalyst into a
trickle bed reactor at normal temperature and normal pressure, introducing
nitrogen to replace the air in a
reaction system, sealing the
nitrogen tightly, replacing the
nitrogen with
hydrogen, and sealing the
hydrogen tightly; (3) regulating the temperature of a catalyst
bed layer, introducing sulfurized oil from the bottom of the reactor, and
wetting the class-II active center hydrogenation catalyst; (4) after the reactor is fully filled with sulfurized oil, introducing the sulfurized oil and
hydrogen from the top of the reactor, forming closed-loop circulation in the
reaction system, adding a sulfurizing agent into sulfurized oil gradually, and continuing to rise the temperature to complete sulfurization; and (5) after sulfurization is accomplished, introducing
raw material oil from the top of the reactor. In the sulfurization method disclosed by the invention, the process is simple, the operation is convenient and quick, and the sulfurization effect is more ideal than the conventional method. Therefore, the method is more favorable for improving the number of class-II active center and consequently improving the activity of the catalyst.