The use of triquaternary alkylammonium ions in the synthesis of STA-5, a magnesio-aluminophosphate with the BPH framework topology

V Patinec, Paul Anthony Wright, Robert Alan Aitken, Philip Lightfoot, SDJ Purdie, PA Cox, Å Kvick, G Vaughan

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The triquaternary organic cations 1,3,5-Tris(triethylammoniomethyl)benzene (1) and 1,3,5-Tris(quinuclidiniomethyl)benzene (2) were synthesized and used as structure-directing agents in the synthesis of magnesioaluminophosphates (MAPOs). 2 Results in the preparation of STA-1, a known structure composed of intersecting large pore channels, whereas 1 results in the synthesis of STA-5, a MAPO with the BPH topology. The structure of STA-5, which contains a one-dimensional cage and channel structure limited by 12-membered rings, was solved using powder X-ray data and confirmed by microcrystal diffraction at a synchrotron source. STA-5 has trigonal symmetry, space group P321, a = 13.221(1) Angstrom, c = 13.339(1) Angstrom. The template was found to be incorporated intact, and by a combination of computation and diffraction, was found to fill space effectively in the channel, with nearly every supercage being occupied by a template molecule. Upon calcination in oxygen at 550 degrees C, the template is removed, leaving the framework of STA-5 intact.

Original languageEnglish
Pages (from-to)2456-2462
Number of pages7
JournalChemistry of Materials
Volume11
Publication statusPublished - Sept 1999

Keywords

  • MICROCRYSTAL DIFFRACTION
  • MOLECULAR-SIEVES
  • ZEOLITE
  • TEMPLATE
  • SOLIDS

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