Facile Hydrothermal Synthesis of EAB‐Type Zeolite under Static Synthesis Conditions,Crystal Research and Technology

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Facile Hydrothermal Synthesis of EAB‐Type Zeolite under Static Synthesis Conditions
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2021-03-15 , DOI: 10.1002/crat.202000163
Takeshi Hagio _{1,

2} , Jae‐Hyeok Park _{1,

2} , Yan Lin ₃ , Yanqin Tian ₃ , Yun Hang Hu ₄ , Xinling Li ₅ , Yuki Kamimoto _{1,

2} , Ryoichi Ichino _{1,

2}

Affiliation

Conventionally, EAB‐type zeolites are crystallized by hydrothermal synthesis for many days under agitational synthesis conditions such as rotation or stirring. In the present study, EAB‐type zeolite is obtained by hydrothermal synthesis within 12 h under static synthesis conditions for the first time. The effects of crystallization temperature, aging of the precursor sol, and addition of seed crystals are investigated. The results reveal that EAB‐type zeolite can be obtained when using a precursor sol with short aging time followed by hydrothermal synthesis in a very narrow temperature range 110 °C−120 °C under static synthesis condition. Addition of seed crystals is found to suppress the formation of SOD‐type zeolite, the primary phase at high hydrothermal synthesis temperatures, while it does not increase the crystallization rate of EAB‐type zeolite. Furthermore, the crystallization behavior at 120 °C is examined by varying the synthesis time. EAB‐type zeolite with invariably twinned plate‐like morphology starts to crystallize between synthesis time of 3 to 6 h at 120 °C under the static synthesis condition.

中文翻译：

静态合成条件下水热合成EAB型沸石

常规上，EAB型沸石是在搅拌或搅拌等搅拌性合成条件下通过水热合成法结晶许多天的。在本研究中，EAB型沸石是在静态合成条件下首次在12小时内通过水热合成获得的。研究了结晶温度，前体溶胶的老化和晶种添加的影响。结果表明，当使用前体溶胶时效时间短，然后在静态合成条件下在110°C-120°C的非常狭窄的温度范围内进行水热合成时，可以得到EAB型沸石。发现添加晶种可以抑制SOD型沸石的形成，而SOD型沸石是高水热合成温度下的主要相，而不会增加EAB型沸石的结晶速率。此外，通过改变合成时间来检查在120℃下的结晶行为。在静态合成条件下，EAB型沸石具有不变的双板状形态，在120°C下3至6 h的合成时间之间开始结晶。

更新日期：2021-04-08

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