高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (7): 907.

• 研究论文 • 上一篇    下一篇

29Si(27Al)MAS NMR考察镧离子在LaDAlY型沸石中的作用

傅军1, 鲍书林2, 须沁华2, 胡澄2   

  1. 1. 复旦大学化学系, 上海 200433;
    2. 南京大学化学系, 固体微结构实验室
  • 收稿日期:1992-11-30 修回日期:1993-02-11 出版日期:1993-07-24 发布日期:1993-07-24
  • 通讯作者: 傅军.
  • 作者简介:第一作者:男, 29岁, 博士, 博士后.
  • 基金资助:

    国家自然科学基金

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

摘要: 29Si(27Al)MASNMR和辅加乙酰丙酮(acac)处理样品的静态27AlNMR研究了镧离子对脱铝Y型沸石(DAIY)骨架硅、铝和非骨架铝(EFAL)的影响.结果表明,29SiMAS谱的化学位移及其形状不仅取决于连接[SiO4]四面体的[AlO]-四面体数目,而且还与引入镧离子的量有关.镧离子的引入导致27AlMAS谱的明显宽化和不对称形变.另外,还讨论了镧离子对非骨架铝的影响.

关键词: 29Si MAS NMR, 27Al MAS NMR, LaDAIY

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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