N1-(3-(trimethoxysilyl)propyl)-1,3-propanediamine (2NS-P), a diaminosilane having a propyl spacer between the two amino groups was successfully synthesized, and a CO2 adsorbent functionalized with 2NS-P was prepared via impregnation of it into silica. The adsorption performance and stability of 2NS-P/Kona95 were examined and compared to that of N1-(3-(trimethoxysilyl)propyl)ethane-1,2-diamine (2NS)/Kona95 having an ethyl spacer. 2NS-P/Kona95 exhibited better CO2 adsorption capacity and CO2/N efficiency. The adsorbents were subjected to ten cycles of temperature swing adsorption (TSA), demonstrating that stability of 2NS-P/Kona95 was better than that of 2NS/Kona95. The spent 2NS-P/Kona95 showed the absence of cyclic urea formation in FT-IR spectrum, explaining the better stability of 2NS-P/Kona95 than 2NS/Kona95.

中文翻译：

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N1-(3-(三甲氧基甲硅烷基)丙基)-1,3-丙二胺制备CO2吸附剂及其性能

成功合成了N1-(3-(三甲氧基甲硅烷基)丙基)-1,3-丙二胺(2NS-P)，一种在两个氨基之间具有丙基间隔基的二氨基硅烷，并通过浸渍制备了2NS-P功能化的CO2吸附剂将其转化为二氧化硅。检查了 2NS-P/Kona95 的吸附性能和稳定性，并将其与具有乙基间隔基的 N1-(3-(三甲氧基甲硅烷基)丙基)乙烷-1,2-二胺 (2NS)/Kona95 的吸附性能和稳定性进行了比较。2NS-P/Kona95 表现出更好的 CO2 吸附能力和 CO2/N 效率。吸附剂经过 10 次变温吸附 (TSA) 循环，表明 2NS-P/Kona95 的稳定性优于 2NS/Kona95。用过的 2NS-P/Kona95 在 FT-IR 光谱中没有形成环脲，这解释了 2NS-P/Kona95 比 2NS/Kona95 更好的稳定性。