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
陈伟 1王鹏飞2
作者信息
- 1. 上海绿强新材料有限公司,上海 201806
- 2. 上海绿强新材料有限公司,上海 201806;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
- 折叠
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/SiO2 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/SiO2 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/SiO2 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、SiO2/Al2O3 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.
Abstract
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.
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Key words
hydrothermal crystallization/nano flake-like high silica ZSM-5 zeolites/toluene/adsorption/regeneration引用本文复制引用
基金项目
上海市青年科技启明星计划(21QB1403600)
出版年
2024
NETL
NSTL
万方数据