Abstract

Submicron zeolite has become the focus of research because of its high thermal stability, high catalytic activity, and uniform size. A rapid method for synthesizing submicron zeolite Y by using microwave heating is introduced in this work. The effect of directing agent, synthesis temperature, crystallization time, and alkali ratio on the synthesis of submicron zeolite Y is systematically investigated. XRD, SEM, and particle size investigations are carried out to characterize the obtained product. The experimental results show that adding directing agent, increasing the alkali ratio, increasing the temperature or prolonging the microwave radiation time are advantageous to the formation and growth of zeolite Y. However, the high alkali ratio leads to the dissolution of the generated crystal, while excessively increasing the temperature or crystallization time easily generates uneven-sized particles or causes crystal transformation. Submicron zeolite Y of particle size 0.5–0.8 μm accounting for 80% is synthesized at 110°C in just 2 h using alkali ratio of 3 under microwave heating.

中文翻译：

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微波加热快速合成亚微米沸石 Y

摘要

亚微米沸石因其热稳定性高、催化活性高、尺寸均匀等特点成为研究热点。本文介绍了一种利用微波加热快速合成亚微米沸石Y的方法。系统研究了导向剂、合成温度、结晶时间和碱比对亚微米沸石Y合成的影响。进行 XRD、SEM 和粒度研究以表征所得产物。实验结果表明，加入导向剂、提高碱比、提高温度或延长微波辐射时间有利于Y沸石的形成和生长。但高碱比导致生成的晶体溶解，而过度提高温度或结晶时间容易产生尺寸不均匀的颗粒或引起晶体转变。在微波加热下，使用碱比为 3，在 110°C 下仅 2 小时合成了粒径为 0.5-0.8 μm 的亚微米沸石 Y，占 80%。