College of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (P. R. China).
Angew Chem Int Ed Engl. 2014 Jun 2;53(23):5868-71. doi: 10.1002/anie.201309766. Epub 2014 Apr 9.
Zeolites have been widely used in industry owing to their ordered micropores and stable frameworks. The pore sizes and shapes are the key parameters that affect the selectivity and efficiency in their applications in catalysis, sorption, and separation. Zeolites with pores defined by 10 and 12 TO4 tetrahedra are often used for various catalytic processes. To optimize the performance of zeolites, it is extremely desirable to fine-tune the pore sizes/shapes. The first germanosilicate zeolite with a three-dimensional 11×11×12-ring channel system, PKU-16 (PKU, Peking University) is presented. Nanosized PKU-16 was structurally characterized by the new three-dimensional rotation electron diffraction (RED) technique. PKU-16 is structurally related to the zeolite β polymorph C (BEC, 12×12×12-ring channels) by rotating half of the four-rings in double mtw units.
由于沸石具有有序的微孔和稳定的骨架，因此被广泛应用于工业领域。孔的大小和形状是影响其在催化、吸附和分离等应用中选择性和效率的关键参数。具有由 10 和 12 TO4 四面体定义的孔的沸石通常用于各种催化过程。为了优化沸石的性能，精细调整孔的大小/形状是非常可取的。本文首次报道了具有三维 11×11×12 环通道系统的第一例锗硅酸盐沸石 PKU-16（PKU，北京大学）。纳米级 PKU-16 的结构通过新的三维旋转电子衍射（RED）技术进行了表征。通过旋转双 mtw 单元中一半的四元环，PKU-16 与沸石β多晶型 C（BEC，12×12×12 环通道）结构相关。
