Multiple-phase disordered zeolites, i.e., intergrowth zeolites, are important industrial catalysts, like single-phase ordered zeolites, but little is known about their rational synthesis and phase competition, mainly due to current poor understanding of the zeolite crystallization mechanism. Here, we theoretically demonstrated that sodalite and cancrinite cage layers, the periodic building units (PerBUs) of FAU/EMT and SBT/SBS structures, respectively, could be nondefectively connected to each other across double rings of 6 tetrahedral atoms when inverted and mirrored. We then synthesized an unprecedented family of FAU/SBT/SBS intergrowths with controllable FAU portions (named as the PST-34 family of intergrowth zeolites) using a multiple inorganic cation approach, providing clear experimental evidence for the layer-by-layer crystal growth mechanism of zeolites. This study shows that control of interactive cooperation extent between different inorganic structure-directing agents in the presence of an unselective organic structure-directing agent may enable repeated stacking of different but structurally related PerBUs in intergrowth zeolite synthesis.

中文翻译：

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共生沸石不同周期结构单元的耦合

多相无序沸石，即共生沸石，与单相有序沸石一样，是重要的工业催化剂，但对其合理合成和相竞争知之甚少，这主要是由于目前对沸石结晶机理的了解不足。在这里，我们从理论上证明了方钠石和钙霞石笼层，分别是 FAU/EMT 和 SBT/SBS 结构的周期构建单元 (PerBU)，在倒置和镜像时可以通过 6 个四面体原子的双环无缺陷地彼此连接。然后，我们使用多种无机阳离子方法合成了前所未有的具有可控FAU部分的FAU/SBT/SBS共生体家族（称为PST-34共生沸石家族），为逐层晶体生长机制提供了明确的实验证据沸石。这项研究表明，在非选择性有机结构导向剂存在的情况下，控制不同无机结构导向剂之间的相互作用合作程度，可能使得不同但结构相关的 PerBU 在共生沸石合成中能够重复堆叠。