多级孔NaX分子筛的合成及CO₂吸附性能

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 N₂ 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 cm³/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.