Patent ID: 6589418
Filing Date: 2003-07-08
Classification: B01J,C10G

Abstract:
A hydrodesulfurization process using an activated CoMo supported catalyst, comprising:(a) heating a Co/Mo supported catalyst to a first temperature of about 350Â° F. to about 450Â° F. in a first effective amount of time, in the presence of hydrogen and hydrogen sulfide, and in the presence of a substantially olefin-free virgin naphtha at a first effective pressure such that the environment is not a reducing environment; (b) holding the Co/Mo supported catalyst at 350Â° F. to about 450Â° F. for a second effective amount of time so that at least 20% of the metals capable of sulfiding will sulfide; (c) further heating said Co/Mo supported catalyst to a second temperature from about 550Â° F. to 700Â° F. in the presence of hydrogen and hydrogen sulfide and in the presence of the virgin naphtha and at a second effective pressure such that the environment is non-reducing, so that substantially all of the metals are sulfided in order to form the activated CoMo supported catalyst; and (d) selectively hydrodesulfurizing a feedstock containing a cracked naphtha in the presence of a catalytically effective amount of the activated CoMo supported catalyst under selective hydrodesulfurization conditions.