CJCU

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (7): 907.

• Articles • Previous Articles     Next Articles

Investigation of the Role of Lanthanum Ions in LaDAlY Zeolites with 29Si, 27Al MAS NMR

FU Jun1, BAO Shu-Lin2, XU Qin-Hua2, HU Cheng2   

  1. 1. Department of Chemistry, Fudan University, Shanghai, 200433;
    2. Department of Chemistry, Laboratory of Solid Slate Microstructwe, Nanjing University, Nanjing, 210008
  • Received:1992-11-30 Revised:1993-02-11 Online:1993-07-24 Published:1993-07-24

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Abstract: The influence of lanthanum ions on the framework silicon, aluminum and extra-framework aluminum of LaDAlYzeolites has been studied by using29Si, 27Al MAS NMRand static 27Al NMRwith acetylacetone treatment.The results show that the chemical shifts and peak profile depend not only on the number of [AlO4]- tetrahedra connected to [SiO4] tetrahedra, but also on the amount of exchanged lanthanum ions.It was also found from 27Al MAS NMRthat the introduction of lanthanum ion makes the peak profile of framework aluminum broadening and asymmetrical.In addition, the effect of lanthanum ions on extra-framework aluminum in LaDAlYzeolites was discussed.

Key words: 29Si MAS NMR, 27Al MAS NMR, LaDAlY

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