Li Wenli[1] Wang Yi[2][1] State Key Laboratory of Catalysis Fundamentals, Dalian Institute of Chemical Physics, Chinese Academy of Sciences [2] Department of Chemistry, Liaoning Normal University Abstract: Using MASNMR spectroscopy, combined with perfluorobutylamine selective adsorption, research The structure of HY molecular sieve before and after modification by MgO and SiO2 and the changes in the acidity of the inner and outer surfaces of the HY molecular sieve were measured. The structure determined by NMR showed that the oxide modification resulted in a significant change in the Si/Al framework of the molecular sieve. The corresponding XRD results confirmed that the comparison before modification , The crystallinity of molecular sieve modified by MgO and SiO2 increased by 6.9% and 15.4%, respectively.

Keywords: HY molecular sieve NMR spectrum nuclear magnetic resonance modification molecular sieve acidic center

Classification number: 　TQ424.25 O643.36