Abstract Synthesis of zeolites from natural aluminosilicate minerals is a green and sustainable technology. One major challenge in the synthesis is how to enhance the reactivity of the natural minerals. Herein we developed a facile quasi-solid-phase method to efficiently depolymerize natural rectorite into its corresponding mesoscale building blocks, i.e., TO4 (T = Si or Al) monomers or oligomeric species. Natural rectorite can be completely and efficiently depolymerized at 170 °C within 60 min, which is substantially lower than temperatures (>900 °C) used in industrial depolymerization methods. The transformation of Si and Al species in the QSP depolymerization mainly undergoes three stages: (1) the layer of Na6AlVI4AlIV2Si6O24·nH2O is dissociated and converted into Na6AlVI2AlIV4Si6O24; (2) Na6AlVI2AlIV4Si6O24 is further depolymerized into Na4AlIV4Si6O20 and monomer NaAlIVO2; (3) Na4AlIV4Si6O20 is finally decomposed into mesoscale monomers (Na4SiO4 and NaAlIVO2), dimers (Na6Si2O7), and chains (Na2SiO3). Moreover, the depolymerized rectorites exhibits high reactivity for synthesizing highly crystalline ZSM-5 zeolite.

中文翻译：

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沸石合成准固相法天然雷托石矿物中尺度解聚

摘要 利用天然铝硅酸盐矿物合成沸石是一项绿色可持续的技术。合成中的一项主要挑战是如何提高天然矿物质的反应性。在此，我们开发了一种简便的准固相方法，可将天然雷托石有效地解聚为其相应的中尺度结构单元，即 TO4（T = Si 或 Al）单体或低聚物。天然雷托石可以在 170 °C 下在 60 分钟内完全有效地解聚，这大大低于工业解聚方法中使用的温度 (>900 °C)。QSP解聚过程中Si和Al物种的转变主要经历三个阶段：（1）Na6AlVI4AlIV2Si6O24·nH2O层解离转化为Na6AlVI2AlIV4Si6O24；(2)将Na6AlVI2AlIV4Si6O24进一步解聚为Na4AlIV4Si6O20和单体NaAlIVO2；(3) Na4AlIV4Si6O20最终分解为中尺度单体（Na4SiO4和NaAlIVO2）、二聚体（Na6Si2O7）和链状（Na2SiO3）。此外，解聚的雷托石对合成高度结晶的 ZSM-5 沸石表现出高反应性。