TY - JOUR
T1 - Structural investigations in pure-silica and Al-ZSM-12 with MTEA or TEA cations
AU - Počkaj, Marta
AU - Meden, Anton
AU - Zabukovec Logar, Nataša
AU - Rangus, Mojca
AU - Mali, Gregor
AU - Lezcano-Gonzalez, Ines
AU - Beale, Andrew M.
AU - Golobič, Amalija
N1 - Publisher Copyright:
© 2017 Elsevier Inc.
PY - 2018/6
Y1 - 2018/6
N2 - 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.
AB - 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.
KW - MTEA
KW - Superstructure
KW - TEA
KW - X-ray powder diffraction
KW - ZSM-12
UR - http://www.scopus.com/inward/record.url?scp=85039794218&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2017.12.015
DO - 10.1016/j.micromeso.2017.12.015
M3 - Article
AN - SCOPUS:85039794218
SN - 1387-1811
VL - 263
SP - 236
EP - 242
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -