Effect of acidity and physical properties of nanozeolite catalyst on hydrocracking of vacuum gas oil

In this study, beta nanozeolite, ultrastable Y zeolite (USY) and amorphous silicaalumina (ASA) were synthesized. These compounds were used as the support of hydrocracking catalyst. NiMo/beta zeoliteASA and NiMo/USY zeoliteASA catalysts were prepared by the impregnation method. The samples were characterized with XRay diffraction (XRD), field emissionscanning electron microscopy (FESEM), temperature programmed desorption (TPD) and BET methods. Catalytic behavior of these catalysts was evaluated on hydrocracking of vacuum gas oil at 400  and 55 bar in a fixed bed continuous microreactor. The XRD patterns of the prepared samples determined the phase structure of the samples. FESEM images of the nanozeolites indicated that the particle sizes of them are less than 10 nm. The results indicated that the catalyst containing USY with higher pore diameter and acidity was more useful in middle distillate products (87%), while the conversion of the catalyst containing beta zeolite was more than the other catalysts (44.8%).