Aerogels are porous media that have large internal surface areas causing them to have significant gas adsorption. The adsorption isotherms of carbon dioxide, nitrogen, oxygen, and argon with a tetramethoxysilane (TMOS) silica aerogel, a [trimethylsilyl]oxy (TMS)-modified silica aerogel, and a silica gel were measured in the pressure range of 0–6.5 atm at 10 °C, 30 °C, 50 °C, 70 °C, and 90 °C. These isotherms were fitted to Langmuir, Freundlich, Sips, and Toth isotherms, as well as the temperature dependent Toth model and their cumulative adsorption of the components of air were discussed. Isosteric heats of adsorption were quantified. With this data, we can see the impact of the surface groups on adsorption as well as the pore size, with a significant increase in the quantity and strength of adsorption of CO₂ reported between silanol and TMS groups. The relationship between adsorption capacity and the thermal properties of silica aerogels were also discussed in this study.

气凝胶是具有大内表面积的多孔介质，导致它们具有显着的气体吸附。在0–6.5 atm的压力范围内测量了四甲氧基硅烷（TMOS）二氧化硅气凝胶，[三甲基甲硅烷基]氧基（TMS）改性的二氧化硅气凝胶和硅胶的二氧化碳，氮气，氧气和氩气的吸附等温线。在10°C，30°C，50°C，70°C和90°C下。这些等温线适用于Langmuir，Freundlich，Sips和Toth等温线，还讨论了与温度有关的Toth模型及其对空气成分的累积吸附。定量吸附的等排热。借助这些数据，我们可以看到表面基团对吸附的影响以及孔径，CO ₂的吸附量和吸附强度显着增加在硅烷醇和TMS组之间报告。本研究还讨论了二氧化硅气凝胶的吸附能力与热性能之间的关系。