Influence of modified Y-zeolites on the catalyst in selective hydrocracking for middle distillate

Carriers were prepared with modified Y-zeolite, amorphous silica-alumina powder and TiO2 powder, and hydrocracking catalysts were manufactured through impregnating with Co/Ni solution. Evaluation of the catalytic performance of the catalysts was carried out on a micro-fixed-bed hydrocracking unit. It was found that the Y-zeolite with lower total acid and higher L-acid ratio was beneficial to middle distillate selectivity and better activity. Preformed catalyst HC-670 had 68.3% middle distillate selectivity compared with 61.8% of industrial catalyst when the production conversion was 60%.