Preparation of Mesoporous Zeolite Y by Fluorine-Alkaline Treatment for Hydrocracking Reaction of Naphthalene

In this study mesoporous zeolite Y (USY-F-AT) was prepared by fluorine-alkaline combined treatment method. The properties of USY-F-AT were characterized by XRD, N-2 physisorption, NH3-TPD, XPS, and TEM. USY-F-AT provided greater mesopore volume and surface area than conventional USY. NH3-TPD showed the USY-F-AT has many more acid sites and stronger acid strength compared with USY. Ni and Mo were impregnated into USY and USY-F-AT to form catalysts NiMo/(Al2O3 + USY) and NiMo/(Al2O3 + USY-F-AT), respectively. The hydrogenation activity and cracking ability of catalysts NiMo/(Al2O3 + USY) and NiMo/(Al2O3 + USY-F-AT) were studied by hydrocracking reaction using naphthalene as model compound. The results showed that catalyst NiMo/(Al2O3 + USY-F-AT) exhibited similar hydrogenation activity but much higher ring-opening ability in comparison with catalyst NiMo/(Al2O3 + USY).