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Publication Detail
Structural investigations in pure-silica and Al-ZSM-12 with MTEA or TEA cations
  • Publication Type:
    Journal article
  • Publication Sub Type:
  • Authors:
    Počkaj M, Meden A, Zabukovec Logar N, Rangus M, Mali G, Lezcano-Gonzalez I, Beale AM, Golobič A
  • Publication date:
  • Pagination:
    236, 242
  • Journal:
    Microporous and Mesoporous Materials
  • Volume:
  • Status:
  • Print ISSN:
© 2017 Elsevier Inc. Two different quaternary ammonium cations, methyltriethyl- (MTEA) and tetraethylammonium cations (TEA) were used as templates in the synthesis of pure-silica as well as aluminosilicate ZSM-12 (MTW-type) frameworks. The distribution of the template cations in the 12-membered rings channels in the 1-dimensional framework topology was studied; thus the as-prepared products were characterized by means of X-ray powder diffraction, Raman, transmission FTIR, solid-state NMR spectroscopy, thermogravimetric and elemental analyses and SEM. It was shown that in pure-silica (PS) ZSM-12, TEA cations are well ordered - a superstructure with three-times longer b edge (in comparison to unit cell of empty framework) along the channel is formed, which can be seen by virtue of a few additional peaks in the X-ray powder pattern. Herein we describe that its aluminosilicate counterpart with TEA also contains ordered TEA cations and is isostructural to PS-ZSM-12. Conversely, in both pure-silica and aluminosilicate ZSM-12 frameworks with MTEA, the cations are disordered and no superstructure is formed.
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