Novel Large-Pore Aluminophosphate Molecular Sieve STA-15 Prepared Using the Tetrapropylammonium Cation As a Structure Directing Agent

Zhongxia Han, A. Lorena Picone, Alexandra M. Z. Slawin, Valerie R. Seymour, Sharon E. Ashbrook, Wuzong Zhou, Stephen P. Thompson, Julia E. Parker, Paul A. Wright

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The novel aluminophosphate STA-15 (St Andrews microporous solid-15) is prepared by hydrothermal synthesis in the presence of tetrapropylammonium hydroxide (TPAOH), which acts as a structure directing agent. The crystallization is accelerated by the addition of low concentrations of tetraphenylphosphonium or other bulky organic cations, and the purity is improved by the addition of silica to the gel, but these additives are not included in the final crystalline product. The structure of STA-15 was solved by a combination of synchrotron X-ray powder diffraction and modeling. The as prepared form of STA-15 (lba2, a = 14.7953(1) angstrom, b = 27.3634(3) angstrom, c = 8.34464(6) angstrom at 100 K) has unit cell composition Al32P32O128(OH)(1.8)TPA(1.8)center dot 3H(2)O. It has a system of one dimensional channels, limited by strongly elliptical 12-membered rings (12 tetrahedral cations and 12 oxygen atoms, 8.7 x 5.7 angstrom) in which the TPA(+) cations reside. The charge-balancing hydroxide ions are coordinated to Framework At, its shown by Al-27 and P-31 MAS NMR. STA-15 is stable to removal of the organic and hydroxyl species upon calcination In oxygen, leaving a microporous solid with a pore volume of 0.11 cm(3) g(-1) and showing uptakes of n-hexane and toluene (at 297 k, p/p(0) = 0.10) of 0.48 and 0.69 mmol g(-1), respectively.

Original languageEnglish
Pages (from-to)338-346
Number of pages9
JournalChemistry of Materials
Volume22
Issue number2
Early online date18 Dec 2009
DOIs
Publication statusPublished - 26 Jan 2010

Keywords

  • 4-CONNECTED 3-DIMENSIONAL NETS
  • CRYSTALLINE INORGANIC SOLIDS
  • FRAMEWORK TOPOLOGY
  • RIETVELD REFINEMENT
  • POWDER DIFFRACTION
  • FORMS
  • ENUMERATION
  • SIMULATION
  • MICROSCOPY
  • CONVERSION

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