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高等学校化学研究 ›› 1989, Vol. 5 ›› Issue (2): 120-124.

• Articles • 上一篇    下一篇

Synthesis and Structure of Large Single Crystal of TPAF-AlPO4-5 Molecular Sieve

Qiu Shilun, Pang Wenqin, Xu Ruren   

  1. Institute of Synthetic and Catalytic Chemistry, Jilin University, Changchun
  • 收稿日期:1988-01-14 出版日期:1989-04-24 发布日期:2011-09-09

Synthesis and Structure of Large Single Crystal of TPAF-AlPO4-5 Molecular Sieve

Qiu Shilun, Pang Wenqin, Xu Ruren   

  1. Institute of Synthetic and Catalytic Chemistry, Jilin University, Changchun
  • Received:1988-01-14 Online:1989-04-24 Published:2011-09-09

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摘要： A large single crystal of TPAF-AlPO4-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride.Starting material composition was · 1 P2O5 · 1 Al2O3 · 2.2 TPAOH · 1.7 NH4F ·318 H2O.The crystal size has a hexagonal prism with 80μm across and 500μm length.The structure of tetrapropylarnmonium fluoride-aluminium phosphate type-5 was investigated with X-ray diffraction.The unit cell composition is 12AlPO4 · TPAF, space group P6cc (a=13.740(5), c=8.474(4)Å).Average bond distances are: P-O 1.564Å and Al-O 1.640Å ,which may be due to the partial disorder of the arrangement of P, Al in the framework.The angles of O-T-O and T-O-T (T=P, Al) are 102-116° and 148-176°, respectively.Residue electron density was not well enough defined to give a precise position for tetrapropylammonium fluoride (TPAF).The template agent, TPA+ cations, situate in the 12-ring channels and F-anions locate in double 4-rings near the 12-ring channels.

关键词: AlPO4-5, molecular sieve, single crystal

Abstract: A large single crystal of TPAF-AlPO4-5 molecular sieve was synthesized by hydrothermal crystallization in the presence of ammonium fluoride.Starting material composition was · 1 P2O5 · 1 Al2O3 · 2.2 TPAOH · 1.7 NH4F ·318 H2O.The crystal size has a hexagonal prism with 80μm across and 500μm length.The structure of tetrapropylarnmonium fluoride-aluminium phosphate type-5 was investigated with X-ray diffraction.The unit cell composition is 12AlPO4 · TPAF, space group P6cc (a=13.740(5), c=8.474(4)Å).Average bond distances are: P-O 1.564Å and Al-O 1.640Å ,which may be due to the partial disorder of the arrangement of P, Al in the framework.The angles of O-T-O and T-O-T (T=P, Al) are 102-116° and 148-176°, respectively.Residue electron density was not well enough defined to give a precise position for tetrapropylammonium fluoride (TPAF).The template agent, TPA+ cations, situate in the 12-ring channels and F-anions locate in double 4-rings near the 12-ring channels.

Key words: AlPO4-5, molecular sieve, single crystal