Abstract: The influence of hydro-processing parameters on poly-ring aromatics saturation of FCC light cycle oil over Ni-Mo-W/γ-Al2O3 and Co-Mo/γ-Al2O3 catalysts was studied in a pilot plant. The results show that Ni-Mo-W catalyst has a higher aromatics saturation activity than Co-Mo catalyst at the same reaction temperature；the mono-ring aromatics selectivity and yield on Co-Mo catalyst is generally better than that of Ni-Mo-W catalyst; and the selective saturation performance of Ni-Mo-W catalyst is more susceptible to the processing parameters. To realize the high rate of poly-ring aromatics saturation and the maximization of mono-aromatics yield, lower reaction temperature is better for Ni-Mo-W catalyst, while Co-Mo catalyst is suitable for the reaction at moderate reaction temperature and higher reaction pressure.

Key words: FCC light cycle oil, aromatics, hydrogenation saturation, selectivity