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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Preparation of Zeolite ANA Crystal from Zeolite Y by in Situ Solid Phase Iso-Structure Transformation
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Preparation of Zeolite ANA Crystal from Zeolite Y by in Situ Solid Phase Iso-Structure Transformation

机译：沸石Y原位固相等结构转变制备ANA沸石晶体。

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摘要

A new method has been explored to synthesize zeolite ANA crystals with regular icositetrahedron in aqueous media via transformation of zeolite Y under the conditions of low temperature, short reaction time, and without organic template. The products are perfect, almost 100% crystals. The samples prepared at different crystallization stages are measured by XRD, TEM, and SEM to investigate the transformation mechanism from zeolite Y to zeolite ANA. It has been demonstrated for the first time that the mechanism of forming a zeolite ANA polycrystal with sphere or shell morphologies is the in situ solid phase iso-structure transformation (Is-SPIST) of zeolite Y. The Is-SPIST mechanism is also supported by the results of steam-induced crystallization experiments and other assistant means, including the same Si/Al ratio, the same weight, the same particle size, and the same morphology before and after transformation of zeolite Y to zeolite ANA. It is also observed that a spherical or shell ANA polycrystal is constructed via the reconstruction from its exterior to interior, to form an ANA single crystal with a solid or hollow icositetrahedron. The main driving force of the reconstruction is considered to be the grain boundary energy existing between polycrystalline grains. This process also obeys the mechanism of in situ solid phase reconstruction (Is-SPR). Furthermore, the size and morphology of the zeolite ANA single crystal can be modified by surfactants.
机译：探索了一种在低温，反应时间短，无有机模板的条件下，通过Y型沸石的转化，在水介质中通过规则二十碳四面体合成ANA分子筛晶体的新方法。产品是完美的，几乎100％的晶体。通过XRD，TEM和SEM对在不同结晶阶段制备的样品进行了测量，以研究Y型沸石向ANA型沸石的转化机理。首次证明形成具有球形或壳形形态的ANA沸石ANA的机理是Y沸石的原位固相同构转变（Is-SPIST）。Is-SPIST机理也得到了支持蒸汽诱导结晶实验和其他辅助手段的结果，包括相同的Si / Al比，相同的重量，相同的粒度以及在Y型沸石转化为ANA型沸石之前和之后的相同形态。还观察到，通过从其外部到内部的重构，构造了球形或壳状的ANA多晶，以形成具有实心或空心二十面体的ANA单晶。重构的主要驱动力被认为是存在于多晶粒之间的晶界能。此过程也服从原位固相重建（Is-SPR）的机制。此外，可以通过表面活性剂改变沸石ANA单晶的尺寸和形态。

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