通过三维电子衍射确定的22×12×12超大孔沸石ITQ-56的合成与结构
Synthesis and Structure of a 22 × 12 × 12 Extra-Large Pore Zeolite ITQ-56 Determined by 3D Electron Diffraction.
作者信息
Kapaca Elina, Jiang Jiuxing, Cho Jung, Jordá José L, Díaz-Cabañas María J, Zou Xiaodong, Corma Avelino, Willhammar Tom
机构信息
Berzelii Centre EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden.
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, China.
出版信息
J Am Chem Soc. 2021 Jun 16;143(23):8713-8719. doi: 10.1021/jacs.1c02654. Epub 2021 Jun 2.
A multidimensional extra-large pore germanosilicate, denoted ITQ-56, has been synthesized by using modified memantine as an organic structure-directing agent. ITQ-56 crystallizes as plate-like nanocrystals. Its structure was determined by 3D electron diffraction/MicroED. The structure of ITQ-56 contains extra-large 22-ring channels intersecting with straight 12-ring channels. ITQ-56 is the first zeolite with 22-ring pores, which is a result of ordered vacancies of double 4-ring (4) units in a fully connected zeolite framework. The framework density is as low as 12.4 T atoms/1000 Å. The discovery of the ITQ-56 structure not only fills the missing member of extra-large pore zeolite with 22-ring channels but also creates a new approach of making extra-large pore zeolites by introducing ordered vacancies in zeolite frameworks.
一种多维超大孔锗硅酸盐，记为ITQ - 56，已通过使用改性美金刚作为有机结构导向剂合成。ITQ - 56结晶为板状纳米晶体。其结构通过三维电子衍射/微电子衍射确定。ITQ - 56的结构包含与直的12元环通道相交的超大22元环通道。ITQ - 56是第一种具有22元环孔的沸石，这是完全连接的沸石骨架中双4元环（4）单元有序空位的结果。骨架密度低至12.4个T原子/1000 Å。ITQ - 56结构的发现不仅填补了具有22元环通道的超大孔沸石中缺失的成员，还开创了通过在沸石骨架中引入有序空位来制备超大孔沸石的新方法。
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