Abstract: With the strengthening of environmental regulations and motor fuel specifications, large refining companies and research institutes outside China pay more attention and provide more fund on the innovation of hydrocracking technology, thus, great progress in catalyst development is achieved. The performances of new series hydrocracking catalysts have been greatly improved since adopting new catalytic materials and preparation technologies. Through modifying the support pore structure and surface acidity distribution, adjusting the interaction between support and metals, incorporating more typeⅡactive sites (which is easy to be activated), the HDN/aromatics saturation activities and stability of new hydro-pretreating catalysts improve significantly. In addition, with the progress in technologies of zeolite synthesis and modification, the improved performances of new generation hydrocracking catalysts not only exhibit at the enhancement of activity, selectivity and stability, but also at the others including operation flexibility, feedstock adaptability, less hydrogen consumption and better product quality.

Key words: hydrocracking , hydro-pretreating, catalyst, activity , midbarrel distillates selectivity