Synthesis and Structure of a 22 × 12 × 12 Extra-Large Pore Zeolite ITQ-56 Determined by 3D Electron Diffraction.
Synthesis and Structure of a 22 × 12 × 12 Extra-Large Pore Zeolite ITQ-56 Determined by 3D Electron Diffraction.
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DOI：
10.1021/jacs.1c02654
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发表时间：
2021-06-16
影响因子：
15
通讯作者：
Willhammar T
中科院分区：
文献类型：
--
作者：
Kapaca E;Jiang J;Cho J;Jordá JL;Díaz-Cabañas MJ;Zou X;Corma A;Willhammar T
以改性美金刚为有机结构导向剂，合成了一种多维超大孔锗硅酸盐（ITQ-56）。ITQ-56结晶为板状纳米晶体。通过3D电子衍射/MicroED确定了其结构。ITQ-56的结构包含与直的12环通道相交的超大的22环通道。ITQ-56是第一个具有22环孔的沸石，这是在完全连接的沸石骨架中双4环（d4 r）单元的有序空位的结果。骨架密度低至12.4 T原子/1000 Ω 3。ITQ-56结构的发现不仅填补了超大孔分子筛中缺少的22环孔道，而且开创了通过在分子筛骨架中引入有序空位来制备超大孔分子筛的新途径。
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 (d4r) units in a fully connected zeolite framework. The framework density is as low as 12.4 T atoms/1000 Å3. 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.
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