Heavy oil hydroprocessing with group VI metal slurry catalyst

摘要

A process for the preparation of a dispersed Group VI-B metal sulfide hydrocarbon oil hydroprocessing catalyst comprising reacting aqueous ammonia and a Group VI-B metal compound, such as molybdenum oxide or tungsten oxide, to form water soluble compounds such as aqueous ammonium molybdates or tungstates. The aqueous ammonium molybdates or tungstates are sulfided at a relatively low temperature with hydrogen sulfide without feed oil, and wherein the mole ratio of the sulfiding agent to metal salts is greater than 2, to produce molybdenum or tungsten sulfide catalysts of high hydroprocessing activity. The catalyst slurry and feed oil can then be passed to a hydroprocessing reactor or can be further sulfided in additional steps of increasing temperature.