Reactivity and Composition of Dispersed Ni Catalyst for Slurry-Phase Residue Hydrocracking

The composition and reactivity of dispersed Ni catalyst was studied for slurry-phase hydrocracking of the residue. The Ni catalyst was separated at different reaction times and characterized. It was concluded that the water-soluble salts turned into NiS and Ni3S2 after the reaction for 1 or 2 h, respectively. After 3 h of reaction, the crystal of Ni9S8 appeared in the catalyst, and after 4 h of reaction, the catalyst was mainly made up of Ni9S8. The “relative coke restraining ratio” (Cr) was introduced and used to show the coke restraining ability of Ni catalysts at different reaction times. It was concluded that the coke restraining ability of the catalyst containing different kinds of crystals was different. To acquire a higher coke restraining ability of the catalyst, the proper reaction time of residue hydrocracking with dispersed Ni catalyst is 1.0−2.0 h.