关键词: 锆改性, Y 型分子筛, 水热稳定性, 催化裂化

Abstract: Zirconium modified Y zeolites were prepared by impregnation with anhydrous-ethanol and aqueous ion exchange method, respectively. The samples were characterized by X-ray diffraction (XRD), nitrogen adsorption desorption, solid-state nuclear magnetic resonance(27Al MAS NMR) spectroscopy and Fourier transform infrared(FT-IR). The results indicated that zirconium modified Y zeolites have better microporous structure and higher thermal stability, and it is difficult for zirconium to replace framework Al of zeolites. The anhydrous ethanol impregnation method is more favorable for zirconium to enter into the cages of the zeolites and interact with the framework tetrahedral, so the prepared zirconium modified Y zeolite shows high crystallinity, specific surface area, and hydrothermal stability. The catalyst contained zirconium modified Y zeolite has high heavy oil conversion ability and gasoline yield, and has stronger resistance to heavy metal pollution.

Key words: zirconium modification, Y zeolite, hydrothermal stability, catalytic cracking