Process for preparing heavy oil hydroprocessing slurry catalyst

Details Process for preparing heavy oil hydroprocessing slurry catalyst Process for preparing heavy oil hydroprocessing slurry catalyst

1985-08-21

1987-12-01

Chaudhuri, Olik

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Sulfur or compound containing same

502220, 208108, 208215, B01J 27047, B01J 27051

Patent

active

047104864

ABSTRACT:
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.

REFERENCES:
patent: 3915894 (1975-10-01), Clements et al.
patent: 4226742 (1980-10-01), Bearden, Jr. et al.
patent: 4243553 (1981-01-01), Naumann et al.
patent: 4431747 (1984-02-01), Seiver et al.

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