锆改性Y型分子筛的水热稳定性及催化裂化性能

摘要

采用无水乙醇浸渍法和水溶液离子交换法制备了锆改性Y型分子筛,通过X射线粉末衍射(XRD)、氮气吸附-脱附,固体核磁共振(27 Al MAS NMR)、傅里叶红外光谱(FT-IR)等手段进行表征.结果表明:所制备的锆改性Y型分子筛具有较好的微孔结构和较高的水热稳定性,锆很难与分子筛骨架铝发生同晶置换作用;采用无水乙醇浸渍法更有利于锆进入分子筛孔道中与骨架铝氧四面体相互作用,所制备的分子筛具有更高的结晶度和比表面积,更好的水热稳定性;含有锆改性Y型分子筛的裂化催化剂具有较高的重油转化能力和汽油收率,抗重金属污染能力强.%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 (27 Al 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 was difficult for zirconium to replace framework Al of zeolites. The anhydrous ethanol impregnation method was more favorable for zirconium to enter into the cages of the zeolites and interact with the framework tetrahedral,so the prepared zirco-nium modified Y zeolite shows high crystallinity,specific surface area,hydrothermal stability. The cata-lyst contained zirconium modified Y zeolite has high heavy oil conversion ability and gasoline yield,and has strong resistance to heavy metal pollution.