有机胺功能化介孔固体吸附剂吸附分离CO2性能研究

针对当前固体胺CO₂吸附剂存在吸附容量小、循环稳定性差等问题，采用高比表面积、易嫁接胺的介孔SBA-15作为载体，研究分子筛模板剂脱除方法和有机胺改性方法对制备的固体吸附剂吸附性能的影响，并采用N₂物理吸附、X射线衍射、红外光谱、热失重分析等表征技术并对样品进行表征。实验结果表明，通过嫁接和浸渍能够合成出不同有机胺负载量的胺功能化吸附剂，其中混合胺嫁接法改性的APTES-SBA（U）-T60吸附剂其吸附容量最大，在75℃下的纯CO₂气氛中吸附量达到192.05 mg/g，优于溶剂萃取和煅烧法去除模板剂。此外，混合胺嫁接法制备的样品在多次的吸/脱附操作下，CO₂吸附稳定性良好，表明混合胺修饰的吸附剂具有很好的稳定性和再生性。

Performance of amine functionalized mesoporous adsorbents for CO2 adsorption

Amine-functionalized nanomaterials have significant potential in CO₂ capture technology because of their low energy consumption, stable performance, and high regeneration capacity. To improve the CO₂ adsorption capacity, the high surface and mesoporous SBA-15 was used as the support for amine modification and CO₂ adsorption. The adsorbents prepared with different modified methods, amines and amine content were characterized by using the BET, XRD, FT-IR, thermo-gravimetric analysis, and TG adsorption test technologies. The adsorption results showed that the grafting of mixed amine modified APTES-SBA (U)-T60 with a high adsorption capacity of 192.05 mg/g under pure CO₂ at 75℃, which is higher than that of solvent extraction and calcination method. Mixed amine modified adsorbents exhibited a high thermal stability and reproducibility.