Patent ID: 8802587

Claim:
A process for preparing a slurry catalyst for use in upgrading heavy oil feedstock, comprising: providing at least a first metal precursor comprising a metal salt of a Primary metal selected from Group VIB metals, Group VIII metals, and Group IIB metals; sulfiding the first metal precursor with a first sulfiding agent at a sulfur to Primary metal molar ratio of at least 1.5 to 1 to form a sulfided catalyst precursor; sulfiding the sulfided catalyst precursor with a second sulfiding agent at a molar ratio of sulfur to metal in the sulfided catalyst precursor of at least 1.5 to 1 for an enhanced sulfided catalyst precursor; mixing the enhanced sulfided catalyst precursor with a hydrocarbon diluent forming a slurry catalyst having an average particle size of 1 to 300 μm.