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]Cl)as a template and solvent.By systematically regulating the ratio of initial gel,including NH4F,[BMIm]Cl,and H2O 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[BMIm]Cl and reducing the H2O 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[BMIm]Cl and synthesis temperature are the critical factors in shortening the induction period of the ZSM-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.
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