Effect of modifier Pd metal on hydrocracking of polyaromatic compounds over Ni-loaded Y-type zeolite and its application as hydrodesulfurization catalyst

Hydrocracking of polycyclic aromatics was conducted at 325-350°C for 0 to 1 h under 30-70 kg/cm² pressure of hydrogen by using nickel-loaded, palladium-loaded, and nickel- and palladium-co-loaded Y-type zeolite catalysts. The results suggest that Pd-Ni-Y catalyst has the highest activity toward the hydrocracking reaction of phenanthrene and pyrene among the catalysts employed. To enhance the catalytic activity of the Ni-Y catalyst, modifying it with palladium was found to be an effective method. Due to its high hydrocracking ability, the Pd-Ni-Y catalyst was also applied to hydrodesulfurization of dibenzothiophene at 300°C, which results in complete conversion of dibenzothiophene.