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Structure-function, recyclability and calorimetry studies of CO2 adsorption on some amine modified Type I & Type II sorbents
International Journal of Greenhouse Gas Control ( IF 4.6 ) Pub Date : 2018-08-30 , DOI: 10.1016/j.ijggc.2018.07.028
Arindom Saha

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.



中文翻译:

在某些胺改性的I型和II型吸附剂上吸附CO 2的结构功能,可回收性和量热研究

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。

更新日期:2018-08-30
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