摘要
本研究选用离子液体(1-丁基-3-甲基咪唑氯盐,[BMIm]Cl)为模板剂兼溶剂,采用离子热合成法成功制备了结晶度高、孔道开放、形貌规整的ZSM-22分子筛.通过系统调控初始凝胶配比,如NH_(4)F、[BMIm]Cl、H_(2)O投料量和晶化时间,实现了对ZSM-22分子筛晶体尺寸和晶化过程的精确控制.研究发现,增加[BMIm]Cl用量、减少水含量可显著提高合成体系的粘度和过饱和度,从而有效促进大量晶核的形成,抑制晶体的生长,制备得到了晶粒长度为700 nm~800 nm,宽度为50 nm~80 nm的ZSM-22分子筛,且与常规合成路线所得分子筛晶粒尺寸相近.经对晶化过程考察认为,[BMIm]Cl和合成温度是缩短ZSM-22分子筛诱导期,加速其成核和晶体生长过程的关键因素.本研究为ZSM-22分子筛的绿色可持续合成提供了新的思路,为其在催化、吸附、分离等领域的应用开辟了广阔前景.
In this study,ZSM-22 zeolite with high crystallinity,open pores,and regular morphology were successfully prepared by the ionothermal synthesis,using ionic liquid(1-butyl-3-methylimidazolium chloride,[BMIm]CI)as a template and solvent.By systematically regulating the ratio of initial gel,including NHF,[BMImJ]Cl,and HO feed amount,and crystallization temperature and time,the crystal size and crystallization process of ZSM-22 zeolites were precisely controlled.The study found that increasing the amount of[BMImj]CI and reducing the H_(2)O content significantly increased the viscosity and supersaturation of the synthesis system,thereby effectively promoting the formation of a large number of crystal nuclei and inhibiting the growth of crystals.The resulting ZSM-22 zeolites with a crystal length of 700 nm~800 nm and a width of 50 nm~80 nm were well-crystallized,similar to thecrystal size obtained from the conventional synthesis route.After investigating the crystallization process,it was believed that[BMImj]Cl and synthesis temperature are the critical factors in shortening the induction period of the zZSM-22 zeolite and accelerating its nucleation and crystal growth process.This study provided a new idea for the green and sustainable synthesis of ZSM-22 zeolite and opens up broad prospects for its application in catalysis,adsorption,separation,and other fields.
作者
周骏峰
顾文瑶
胡心洁
梁子佳
罗奕鑫
孙美琦
宋金辉
刘粟侥
方奕文
ZHOU Junfeng;GU Wenyao;HU Xinjie;LIANG Zijia;LUO Yixin;SUN Meiqi;SONG Jinhui;LIU Suyao;FANG Yiwen(College of Chemistry&Chemical Engineering,Shantou University,Shantou 515063,Guangdong,China)
出处
《汕头大学学报（自然科学版）》
2024年第4期3-12,F0002,共11页
Journal of Shantou University：Natural Science Edition
基金
国家自然科学基金(22072174)
广东省自然科学基金项目(2023A1515012115)
汕头大学卓越人才科研启动项目(NTF22013)。
关键词
离子液体
合成参数
晶化机理
分子筛
zeolite
ionic liquid
synthesis parameters
crystallization mechanism
