Abstract:

In order to improve the CO₂ sorption performance of sodium-based sorbent, a series of sodium-based sorbents with amino modification were prepared by sol-gel method and the corresponding CO₂ sorption capacity were investigated in this paper. Tetraethylorthosilicate (TEOS) was chosen as the carrier precursor by comparing the amine loss rate and CO₂ sorption capacity of pure -NH₂ sorbents,and Na₂CO₃ was as the active ingredient. 3-aminopropyltrimethoxysilane (APS), 3-aminopropyltriethoxysilane (APTES), diethylenetriamine (DETA) and triethylenetetramine (TETA) were used, respectively as the amino precursor for synthesizing the composite sorbents and then drying them with conventional technique. Results showed that the sorbent modified with TETA had the highest CO₂ sorption capacity and the best pore structure, while that modified with APTES had the lowest amine loss but poor structure.

Key words: CO₂ capture, solid sorbents, Na₂CO₃, amino modification, silica, sol-gel

摘要：

为弥补常规钠基吸收剂活性差、脱碳量低的不足,制备了多种表面氨基修饰的新型复合型钠基吸收剂并研究其脱碳特性。通过比较氨基流失率和实际脱碳量,选定二氧化硅的前驱物正硅酸乙酯为载体前驱物,以碳酸钠为活性成分,分别以3-氨基丙基三甲氧基硅烷(APS)、3-氨基丙基三乙氧基硅烷(APTES)、二乙烯三胺(DETA)、三乙烯四胺(TETA)为氨基前驱物,制备得到多种表面氨基修饰的复合型钠基吸收剂。探究各种吸收剂的孔隙结构与脱碳特性,结果表明,APS、APTES修饰后吸收剂孔隙特性较差,脱碳量较低,DETA、TETA修饰后吸收剂孔隙结构得到改善,脱碳量较高。

关键词: CO₂捕集, 固体吸收剂, Na₂CO₃, 氨基修饰, 二氧化硅, 溶胶凝胶法