The influence of aging conditions on the properties of aluminosilicate precursors is investigated and the crystallization process afterward is compared using aluminosilicate precursors with the same Si/Al ratio but with different Al coordination and ring structures. When the aging temperature is increased, alkalinity is raised or aging time is extended, the Si/Al of the obtained amorphous precursor decreases. A detailed investigation is conducted on three amorphous precursors with the same Si/Al. It is revealed that aging under low temperature or for a short aging time under high alkalinity leads to the formation of aluminosilicate precursors with a high ratio of tetrahedral Al and small rings on the structure. The three amorphous precursors are used for the synthesis of CHA-type zeolite to examine how those properties could influence its crystallization behavior. Zeolite synthesis employing two of the three precursors result in shorter time compared with the conventional synthesis without aging, suggesting that the use of aluminosilicate precursors whose local structures are partially organized could lead to shorter nucleation times.

中文翻译：

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揭示老化条件、非晶前驱体性质和 CHA 型沸石结晶之间的关系

研究了老化条件对硅铝酸盐前驱体性能的影响，并使用具有相同Si/Al比但具有不同Al配位和环结构的硅铝酸盐前驱体比较了随后的结晶过程。当提高时效温度、提高碱度或延长时效时间时，所得非晶前驱体的Si/Al降低。对具有相同 Si/Al 的三种非晶前驱体进行了详细研究。结果表明，低温老化或高碱度短老化时间导致形成具有高四面体Al比例和结构上小环的铝硅酸盐前驱体。这三种无定形前驱体用于合成 CHA 型沸石，以研究这些特性如何影响其结晶行为。与没有老化的传统合成相比，使用三种前体中的两种的沸石合成时间更短，这表明使用局部结构部分组织的铝硅酸盐前体可以导致更短的成核时间。