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.

两种不同的季铵阳离子，甲基三乙基-（MTEA）和四乙基铵阳离子（TEA）被用作模板，用于合成纯二氧化硅和硅铝酸盐ZSM-12（MTW型）骨架。研究了一维骨架拓扑结构中模板阳离子在十二元环通道中的分布。因此，通过X射线粉末衍射，拉曼光谱，透射FTIR，固态NMR光谱，热重和元素分析以及SEM来表征所制备的产物。结果表明，在纯硅（PS）ZSM-12中，TEA阳离子排列整齐-上层结构的长倍三倍b沿通道形成了边缘（与空框架的晶胞相比），这可以通过X射线粉末图案中的一些其他峰看到。在本文中，我们描述了其与TEA的硅铝酸盐对应物也包含有序的TEA阳离子，并且与PS-ZSM-12是同构的。相反，在具有MTEA的纯二氧化硅和铝硅酸盐ZSM-12骨架中，阳离子都是无序的，不会形成超结构。