Post-synthesis alumination of mesoporous silica SBA-15 with high framework aluminum content using ammonium hexafluoroaluminate

Hsien Ming Kao, Chun Chiang Ting, Shih Wei Chao

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49 Scopus citations

Abstract

Incorporation of high aluminum contents into the silica framework of SBA-15 was achieved by treating SBA-15 with an aqueous (NH4) 3AlF6 solution at room temperature under alkaline conditions. Characterization by powder X-ray diffraction (XRD), N2 adsorption-desorption, transmission electron microscopy (TEM), FTIR, and multinuclear solid-state NMR measurements was carried out to evaluate the efficiency of this alumination method. 27Al magic angle spinning (MAS), 1H/27Al TRAnsfer of Population in DOuble Resonance (TRAPDOR) NMR, and cumene cracking measurements demonstrated that the aluminated SBA-15 materials contained exclusively tetrahedrally coordinated aluminum and exhibited well-developed Brønsted acidity. A high level of framework aluminum substitution, up to an Si/Al ratio near 5, without any significant loss in the textural properties of SBA-15, was achieved via the present post-synthesis route. 19F MAS NMR was helpful in gaining more insights into the mechanism of the present alumination process.

Original languageEnglish
Pages (from-to)200-208
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume235
Issue number1-2
DOIs
StatePublished - 1 Jul 2005

Keywords

  • Brønsted acidity
  • Post-synthesis alumination
  • SBA-15
  • Solid-state NMR

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