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Location of alkali ions and their relevance to crystallization of low silica X zeolite

机译:低硅X沸石中碱金属离子的位置及其与结晶的关系

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摘要

A novel method of intermediate addition of alkali ions is proposed to give phase selectivity of zeolite in crystallization stages. Location of alkali metal ions in formed zeolite A, low silica zeolite X (LSX), and their hydrogel prior to the crystallization is investigated with ion exchange isotherms in order to clarify the crystallization mechanism, where the specific alkali metal ion is required for selective growth of the zeolites. The role of potassium ion for the crystallization is found to be important to determine the final phase of crystals. Hydrated potassium ion has a function to assemble aluminosilicate precursors to form LSX by a strong salting-out effect; otherwise, sodium ion assembles the same building units into zeolite A. Intermediate addition of potassium ion into crystallizing media controls the final precipitating crystalline phase kinetically. Here our proposed method enables the building unit for zeolite A to be quenched and deposited into aluminosilicate hydrogel, resulting in the selective formation of LSX in the hydrogel phase.
机译:提出了一种新的中间添加碱金属离子的方法,以使沸石在结晶阶段具有相选择性。用离子交换等温线研究了碱金属离子在形成的沸石A,低硅沸石X(LSX)及其水凝胶中结晶之前的位置,以阐明其结晶机理,其中选择性生长需要特定的碱金属离子沸石。发现钾离子对于结晶的作用对于确定晶体的最终相是重要的。水合钾离子具有通过强盐析作用组装铝硅酸盐前体以形成LSX的功能。否则,钠离子将相同的结构单元组装成沸石A。向结晶介质中中间添加钾离子可动态控制最终沉淀出的结晶相。在这里,我们提出的方法可以使A型沸石的构建单元淬灭并沉积到铝硅酸盐水凝胶中,从而在水凝胶相中选择性形成LSX。

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