纳米薄片状高硅ZSM-5分子筛的制备及其甲苯脱除性能研究  

Preparation of nano flake-like high silica ZSM-5 zeolite and study on its performance for toluene removal

作　　者：陈伟 王鹏飞 CHEN Wei;WANG Peng-fei(Shanghai Luqiang New Materials Co.,Ltd.,Shanghai 201806,China;State Key Laboratory of Polyolefin Catalytic Technology and Performance Materials,Shanghai Research Institute of Chemical Industry Co.,Ltd.,Shanghai 200062,China)

机构地区：[1]上海绿强新材料有限公司,上海201806 [2]上海化工研究院有限公司,聚烯烃催化技术与高性能材料国家重点实验室,上海200062

出　　处：《现代化工》2024年第5期163-169,共7页Modern Chemical Industry

基　　金：上海市青年科技启明星计划项目(21QB1403600)。

摘　　要：以四丙基氢氧化铵(TPAOH)为模板剂、NH4F为矿化剂,运用水热晶化法制备厚度为10~100 nm的纳米薄片状高硅ZSM-5分子筛,考察TPAOH/SiO_(2)摩尔比、晶化温度对纳米薄片状高硅ZSM-5分子筛制备的影响,并对其甲苯动态吸附性能进行评价。结果表明,晶化温度为90℃时,随着TPAOH/SiO_(2)摩尔比的增加,纳米薄片状高硅ZSM-5分子筛的尺寸与厚度减小,孔容与平均孔径增大。TPAOH/SiO_(2)摩尔比为0.35时,晶化温度的升高不影响纳米薄片状高硅ZSM-5分子筛的形貌、结晶度与孔结构。相比市售高硅ZSM-5分子筛,厚度10~20 nm、SiO_(2)/Al_(2)O_(3)摩尔比为305的纳米薄片状高硅ZSM-5分子筛对甲苯的动态穿透吸附容量增加约22.5%、饱和吸附容量增加约26.8%,且吸附曲线符合Yoon-Nelson模型。经20次重复再生后,该纳米薄片状高硅ZSM-5分子筛的甲苯吸附容量衰减低于0.5%,展现出良好的再生使用性能。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 NH_4F as mineralizing agent.The influences of TPAOH/SiO_(2)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/SiO_(2)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/SiO_(2)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 SiO_(2)/Al_(2)O_(3)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.

关 键 词：水热晶化 纳米薄片状高硅ZSM-5分子筛 甲苯 吸附 重复再生 

分 类 号：X701[环境科学与工程—环境工程]