Effect of Various Catalyst Precursors on Hydroconversion of Heavy Cracked Cycle Oil

Abstract

Vacuum residue-stabilized concentrated suspensions of nanosized metal sulfide particles are synthesized from inverted emulsions of aqueous solutions of Мо, Ni, Fe, and W salts by heat treatment in the presence of a sulfiding agent and hydrogen. The synthesized catalysts are tested in the hydroconversion of heavy cracked cycle oil with a high content of aromatic hydrocarbons. Hydroconversion is carried out in an autoclave at 425°С at a hydrogen pressure of 7 MPa and a catalyst content in the reaction zone of 0.1% per metal. Our studies suggest that Мо- and Ni-containing catalysts show a higher activity in hydrogenation and hydrodesulfurization reactions. Catalytic activity, which is assessed from an increase in the ratio of paraffin-naphthene to aromatic hydrocarbons and the H/C ratio in hydrogenation product fractions, decreases in the sequence МоS₂, (МоS₂ + Ni₇S₆), Ni₇S₆, Fe_{1 –x}S, and (NH₄)_0.25WO₃.