ITQ-54: a multi-dimensional extra-large pore zeolite with 20 x 14 x 12-ring channels
ITQ-54: a multi-dimensional extra-large pore zeolite with 20 x 14 x 12-ring channels
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DOI：
10.1039/c4sc02577f
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发表时间：
2015-01-01
期刊：
影响因子：
8.4
通讯作者：
Corma, Avelino
中科院分区：
文献类型：
--
作者：
Jiang, Jiuxing;Yun, Yifeng;Corma, Avelino
通过原位分解N，N-二环己基异吲哚鎓阳离子合成了一种多维超大孔硅锗酸盐沸石ITQ-54。用三维旋转电子衍射（RED）方法解析了其晶体结构。1 μ m大小。ITQ-54的结构包含沿三个晶轴沿着的直交叉的20 × 14 × 12环通道，并且它是在多于一个方向上具有超大通道的少数沸石之一. ITQ-54具有11.1 T原子/1000 A（3）的骨架密度，这是已知沸石中最低的之一。ITQ-54与作为杂质的GeO 2一起获得。开发了一种重液分离方法，并成功地应用于从沸石中除去该杂质。ITQ-54在高达600摄氏度的温度下是稳定的，并具有永久的多孔性。使用粉末X-射线衍射（PXRD）数据对所制备的样品和煅烧的样品两者的结构进行进一步细化。
A multi-dimensional extra-large pore silicogermanate zeolite, named ITQ-54, has been synthesised by in situ decomposition of the N,N-dicyclohexylisoindolinium cation into the N-cyclohexylisoindolinium cation. Its structure was solved by 3D rotation electron diffraction (RED) from crystals of ca. 1 mu m in size. The structure of ITQ-54 contains straight intersecting 20 x 14 x 12-ring channels along the three crystallographic axes and it is one of the few zeolites with extra- large channels in more than one direction. ITQ-54 has a framework density of 11.1 T atoms per 1000 A(3), which is one of the lowest among the known zeolites. ITQ-54 was obtained together with GeO2 as an impurity. A heavy liquid separation method was developed and successfully applied to remove this impurity from the zeolite. ITQ-54 is stable up to 600 degrees C and exhibits permanent porosity. The structure was further refined using powder X-ray diffraction (PXRD) data for both as-made and calcined samples.