Počkaj, M;
Meden, A;
Zabukovec Logar, N;
Rangus, M;
Mali, G;
Lezcano-Gonzalez, I;
Beale, AM;
(2017)
Structural investigations in pure-silica and Al-ZSM-12 with MTEA or TEA cations.
Microporous and Mesoporous Materials
, 263
pp. 236-242.
10.1016/j.micromeso.2017.12.015.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | Structural investigations in pure-silica and Al-ZSM-12 with MTEA or TEA cations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.micromeso.2017.12.015 |
| Publisher version: | https://doi.org/10.1016/j.micromeso.2017.12.015 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | ZSM-12, TEA, MTEA, Superstructure, X-ray powder diffraction |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10047826 |
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