A facile structural conversion process from Ge-rich IWW-type germanosilicate to its daughter structure IPC-18 zeolite has been developed under mild conditions of water medium and room temperature. The parent IWW zeolite with an extremely low Si/Ge ratio of 1.02, synthesized with 1,4-bis-(dimethyl-1-adamantylammonium)-butane as a novel structural directing agent, was critical for the success of this specific structural transformation. The high Ge content favored the breaking of double-four-ring (d4r) subunits under mild conditions and simultaneously the mild H₂O medium suppressed the Si-assisted structural repairing. The HRTEM images collected along the (001) and (010) orientations of IWW and IPC-18 zeolite revealed the occurrence of structural transformation. The formation of IPC-18 zeolite structure was confirmed by the PXRD patterns and selected area electron diffraction patterns. The obtained IPC-18 zeolite demonstrated promising catalytic performance in the hydration of ethylene oxide to ethylene glycol with a high selective of 96%.

在温和的水介质和室温条件下，已经开发了一种从富Ge的IWW型锗硅酸盐到其子结构IPC-18沸石的简便结构转化过程。用1,4-双-（二甲基-1-金刚烷铵）-丁烷作为新型结构导向剂合成的，具有极低的Si / Ge比1.02的母体IWW沸石对于这种特定结构转化的成功至关重要。高Ge含量有利于在温和条件下破坏双四环（d 4 r）亚基，同时在温和条件下破坏H _2。O介质抑制了Si辅助的结构修复。沿IWW和IPC-18沸石的（001）和（010）方向收集的HRTEM图像揭示了结构转变的发生。通过PXRD图和选择的区域电子衍射图证实了IPC-18沸石结构的形成。所获得的IPC-18沸石在环氧乙烷合成乙二醇的水合反应中显示出令人鼓舞的催化性能，选择性高达96％。