Chinese Journal of Applied Chemistry ›› 1992, Vol. 0 ›› Issue (4): 61-63.

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ON THE COORDINATION CONDITIONS OF AI IN MOLECULAR SIEVE SAPO-5

Zhao Daqing1, Qiu Shilun1, Pang Wenqin1, Jing Fengying2, Wu Yijie2, Xiao Yianwen2   

  1. 1. Department of Chemistry, Jilin University, Changchun 130023;
    2. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun
  • Received:1991-04-08 Revised:1991-08-20 Published:1992-08-10 Online:1992-08-10

Abstract: The molecular sieves SAPO-5 have been synthesized by hydrothermal crystallization from Pr3N-P2O5-Al2O3-SiO2-H2O-HF.Experiments of preparation conditions show that the key for the successful preparation of SAPO-5 lies in the formation of AlPO4 gel.The 27Al NMR results showed that in this case Al is four-coordinated.Tripropylamine was used as a template to stabilize tetrahedral Al and prevent it from attack of water.The EPMA analysis showed that an isomorphic substitution of P and A for Si occurs in SAPO-5 crystals.

Key words: molecular sieve, SAPO-5, preparation, hydrothermal crystallization, 27Al NMR, EPMA