Jiang Jiuxing, Yun Yifeng, Zou Xiaodong, Jorda Jose Luis, Corma Avelino
Instituto de Tecnología Química (UPV-CSIC) , Universidad Politécnica de Valencia - Consejo Superior de Investigaciones Científicas , Av. de los Naranjos s/n , 46022 Valencia , Spain . Email:
Berzelii Center EXSELENT on Porous Materials and Inorganic and Structural Chemistry , Department of Materials and Environmental Chemistry , Stockholm University , SE-106 91 Stockholm , Sweden . Email:
Chem Sci. 2015 Jan 1;6(1):480-485. doi: 10.1039/c4sc02577f. Epub 2014 Oct 8.
A multi-dimensional extra-large pore silicogermanate zeolite, named ITQ-54, has been synthesised by decomposition of the ,-dicyclohexylisoindolinium cation into the -cyclohexylisoindolinium cation. Its structure was solved by 3D rotation electron diffraction (RED) from crystals of 1 μm in size. The structure of ITQ-54 contains straight intersecting 20 × 14 × 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 Å, which is one of the lowest among the known zeolites. ITQ-54 was obtained together with GeO 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 °C and exhibits permanent porosity. The structure was further refined using powder X-ray diffraction (PXRD) data for both as-made and calcined samples.
一种名为ITQ-54的多维超大孔硅锗酸盐沸石，是通过将α,α-二环己基异吲哚鎓阳离子分解为α-环己基异吲哚鎓阳离子而合成的。其结构通过对尺寸为1μm的晶体进行三维旋转电子衍射（RED）解析得到。ITQ-54的结构在三个晶轴方向上包含直交的20×14×12元环孔道，它是少数几个在多个方向上具有超大孔道的沸石之一。ITQ-54的骨架密度为每1000 Å有11.1个T原子，这是已知沸石中最低的之一。ITQ-54是与作为杂质的GeO一起获得的。开发了一种重液分离方法并成功应用于从沸石中去除这种杂质。ITQ-54在高达600°C时稳定，并表现出永久孔隙率。使用原样和煅烧样品的粉末X射线衍射（PXRD）数据对结构进行了进一步细化。
