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3D Study of the Morphology and Dynamics of Zeolite Nucleation

机译:沸石成核形貌和动力学的3D研究

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摘要

The principle aspects and constraints of the dynamics and kinetics of zeolite nucleation in hydrogel systems are analyzed on the basis of a model Na-rich aluminosilicate system. A detailed time-series EMT-type zeolite crystallization study in the model hydrogel system was performed to elucidate the topological and temporal aspects of zeolite nucleation. A comprehensive set of analytical tools and methods was employed to analyze the gel evolution and complement the primary methods of transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) spectroscopy. TEM tomography reveals that the initial gel particles exhibit a core-shell structure. Zeolite nucleation is topologically limited to this shell structure and the kinetics of nucleation is controlled by the shell integrity. The induction period extends to the moment when the shell is consumed and the bulk solution can react with the core of the gel particles. These new findings, in particular the importance of the gel particle shell in zeolite nucleation, can be used to control the growth process and properties of zeolites formed in hydrogels.
机译:在模型Na富铝硅酸盐体系的基础上,分析了水凝胶体系中沸石成核动力学和动力学的原理和约束。在模型水凝胶系统中进行了详细的时间序列EMT型沸石结晶研究,以阐明沸石成核的拓扑和时间方面。使用了一套全面的分析工具和方法来分析凝胶的演化,并补充透射电子显微镜(TEM)和核磁共振(NMR)光谱学的主要方法。 TEM断层扫描显示最初的凝胶颗粒显示出核-壳结构。沸石成核在拓扑学上限于该壳结构,成核动力学由壳的完整性控制。诱导期延伸至壳被消耗且本体溶液可与凝胶颗粒的核心反应的时刻。这些新发现,特别是凝胶颗粒壳在沸石成核中的重要性,可用于控制水凝胶中形成的沸石的生长过程和特性。

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