多级孔NaX分子筛的合成及CO2吸附性能

采用两步晶化和氨基酸辅助的协同合成策略, 制备了具有高产率(89%)和高结晶度(微孔体积为0.30 cm ³/g)的多级孔NaX分子筛. 利用X射线粉末衍射、 扫描电子显微镜、 透射电子显微镜和氮气吸附等技术, 考察了两步晶化和氨基酸加入量对NaX分子筛的形貌、 相对结晶度和产率的影响. 实验结果表明, 两步晶化有利于多级孔结构的产生, 氨基酸的引入有助于提高分子筛相对结晶度和产率. 与传统方法合成的NaX分子筛相比, 该合成策略制备的多级孔NaX分子筛展现出更优异的CO₂吸附性能, 在273 K和100 kPa条件下, 其CO₂吸附量达到154.2 cm ³/g, 而传统NaX分子筛的CO₂吸附量为147.6 cm ³/g. 该合成策略为绿色且高效制备高质量的多级孔分子筛提供了新思路.

Synthesis of Hierarchical NaX Zeolite and Its CO2 Adsorption Performance

High-quality hierarchical NaX zeolites with high product yield and high crystallinity were prepared by synergistically using a two-step crystallization process and L-lysine-assisted approach.XRD,SEM,TEM,XRF and N 2 adsorption-desorption tests are used to investigate the influence of L-lysine and crystallization steps on the mesoporosity,crystallinity,and the yield of NaX zeolites.In this synthetic strategy,two-step crystallization favors the generation of mesopores;and L-lysine plays an important role in improving the zeolite crystallinity as well as the product yield.Owing to the high-quality hierarchical zeolite crystals,the as-prepared NaX zeolite exhibits excellent performance in CO2 adsorption with CO2 uptake of 154.2 cm^3/g at 273 K and 100 kPa.This green and facile synthetic strategy opens a new way to fabricate high-quality hierarchical NaX zeolites,promising their practical applications in CO2 adsorption.