CO₂ adsorption was studied on different amines immobilized on silica, polymethyl methacrylate (PMMA) and mesoporous SBA-15 substrates. Hyperbranched polyethyleneimine (PEI) was impregnated onto silica and PMMA to generate Type I sorbents and their CO₂ adsorption capacities were measured and compared to the respective unmodified supports. Amine-functionalized Type II sorbents were also synthesized by loading different amounts of a monoamine ((3-Aminopropyl) triethoxysilane), a diamine (N-[3-(Trimethoxysilyl) propyl] ethylenediamine) and a triamine (N¹-(3-Trimethoxysilylpropyl) diethylenetriamine) onto mesoporous SBA-15 using grafting techniques. Nitrogen physisorption studies, surface density measurements and low angle XRD plots indicated a progressive filling of SBA-15 pores with increase in respective amine loadings. CO₂ breakthrough studies conducted on PEI impregnated silica and PMMA at 40 °C and 60 °C showed that the temperature strongly influenced the CO₂ adsorption capacities. The amount of total CO₂ captured on amine-grafted SBA-15 sorbents increased with rise in amine density and amine type in the order Triamine > Diamine > Monoamine. All recyclability studies on the amine-modified sorbents yielded consistent CO₂ capture capacities over a period of 3–5 adsorption–regeneration cycles. Simultaneous determination of adsorption capacities and corresponding associated heats at important stages of a complete CO₂ breakthrough run (under both dry & moist conditions) provided critical real-time insights into the adsorption process and can be used as an effective tool for screening potential sorbents.

研究了固定在二氧化硅，聚甲基丙烯酸甲酯（PMMA）和中孔SBA-15基质上的不同胺对CO _2的吸附。将超支化聚乙烯亚胺（PEI）浸渍在二氧化硅和PMMA上以生成I型吸附剂，并测量其对CO _2的吸附能力，并将其与相应的未改性载体进行比较。还通过装载不同量的单胺（（3-氨基丙基）三乙氧基硅烷），二胺（N- [3-（三甲氧基甲硅烷基）丙基]乙二胺）和三胺（N ¹）来合成胺官能化的II型吸附剂。-（3-三甲氧基甲硅烷基丙基）二亚乙基三胺）通过接枝技术连接到中孔SBA-15上。氮的物理吸附研究，表面密度测量和低角度XRD图表明，随着相应胺负荷的增加，SBA-15孔逐渐填充。在40°C和60°C下对PEI浸渍的二氧化硅和PMMA进行的CO ₂突破研究表明，温度强烈影响了CO _2的吸附能力。胺接枝的SBA-15吸附剂捕获的总CO ₂量随胺密度和胺类型的增加而增加，顺序为三胺>二胺>单胺。关于胺改性吸附剂的所有可回收性研究均产生一致的CO ₂在3–5个吸附-再生周期内捕获容量。在完整的CO ₂突破运行的重要阶段（在干燥和潮湿条件下）同时确定吸附容量和相应的伴热，可提供对吸附过程的关键实时洞察力，并可作为筛选潜在吸附剂的有效工具。