High silica nano flake-like ZSM-5 zeolite with a thickness of 10-100 nm are successfully prepared through hydrothermal crystallization method with tetrapropylammonium hydroxide(TPAOH)as template and NH4 F as mineralizing agent.The influences of TPAOH/SiO2 molar ratio and crystallization temperature on the preparation of nano flake-like high silica ZSM-5 zeolite are studied,and its dynamic adsorption performance for toluene is evaluated.The results indicate that under 90℃,with the increasing TPAOH/SiO2 molar ratio,the size and thickness of the nano flake-like high silica ZSM-5 zeolite prepared decreases while the total pore volume and average pore size increase.The morphology,crystallinity and pore structure of the prepared nano flake-like high silica ZSM-5 zeolite are not affected by increasing hydrothermal crystallization temperature when TPAOH/SiO2 molar ratio is 0.35.Compared with commercial high silica ZSM-5 zeolite,the dynamic penetration adsorption capacity and saturation adsorption capacity of toluene by the as-prepared nano flake-like high silica ZSM-5 zeolite with a thickness of 10-20 nm and a SiO2/Al2 O3 molar ratio of 305 increase by about 22.5%and 26.8%,respectively,and the adsorption curves accord with Yoon-Nelson model.After the as-prepared nano flake-like high silica ZSM-5 zeolite has experienced 20 times of regeneration,its adsorption capacity for toluene only attenuates less than 0.5%,showing a good regeneration performance.
hydrothermal crystallizationnano flake-like high silica ZSM-5 zeolitestolueneadsorptionregeneration
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