초록 ▼

A process for the preparation of a dispersed Group VIB metal sulfide hydrocarbon oil hydroprocessing catalyst comprising reacting aqueous ammonia and a Group VIB metal compound, such as molybdenum oxide or tungsten oxide, to form a water soluble oxygen-containing compound such as aqueous ammonium mo

A process for the preparation of a dispersed Group VIB metal sulfide hydrocarbon oil hydroprocessing catalyst comprising reacting aqueous ammonia and a Group VIB metal compound, such as molybdenum oxide or tungsten oxide, to form a water soluble oxygen-containing compound such as aqueous ammonium molybdate or tungstate. The aqueous ammonium molybdate or tungstate is sulfided in at least three sulfiding steps of increasing temperature including a low temperature sulfiding step, an intermediate temperature sulfiding step and a high temperature sulfiding step. Some of the oxygen associated with said Group VIB metal is replaced by sulfur in each of the sulfiding steps. It has been found the maximum total level of replacement of oxygen by sulfur achieved in the intermediate temperature step is particularly critical to catalyst activity. In accordance with this invention, in the intermediate temperature sulfiding step the maximum total stoichiometric level of replacement by sulfur of oxygen associated with the Group VIB metal reaches a level of 50 to 95 percent. Additional replacement of oxygen with sulfur occurs in the high temperature sulfiding step.

대표청구항 ▼

A process including the preparation of a dispersed Group VIB metal sulfide hydrocarbon oil hydroprocessing catalyst comprising sulfiding an aqueous ammonium salt of oxygen-containing Group VIB metal compound in at least three sulfiding steps of increasing temperature including a low temperature sulf

A process including the preparation of a dispersed Group VIB metal sulfide hydrocarbon oil hydroprocessing catalyst comprising sulfiding an aqueous ammonium salt of oxygen-containing Group VIB metal compound in at least three sulfiding steps of increasing temperature including a low temperature sulfiding step having a temperature in the range 70°to 350°F., an intermediate temperature sulfiding step having a temperature in the range 180°to 700°F. which is higher than the temperature in said low temperature sulfiding step, and a feed hydrocarbon oil-containing high temperature sulfiding step having a temperature in the range 500°to 750°F. which is higher than the temperature in said intermediate temperature step, the residence time in each of said sulfiding steps being at least 0.02 hours, some of the oxygen associated with said Group VIB metal being replaced by sulfur in each of said sulfiding steps, in said intermediate temperature sulfiding step the total stoichiometric replacement with sulfur of oxygen associated with said Group VIB metal achieving a maximum level of 50 to 95 percent, with additional replacement of oxygen with sulfur occurring in said high temperature step.