篇名 | 低分壓下二氧化碳吸附劑之吸附動力學探討 |
---|---|
卷期 | 13:2 |
並列篇名 | Kinetics of CO2 Adsorption under Low CO2 Partial Pressures |
作者 | 周豐志 、 吳淑姿 、 余世宗 |
頁次 | 045-055 |
關鍵字 | 活性碳 、 silica xerogel 、 amine-grafted silica xerogel 、 carbon dioxide 、 二氧化碳 |
出刊日期 | 201709 |
本研究使用吸附劑(活性碳、silica xerogel和amine-grafted silica xerogel),探討三種吸附 劑吸附二氧化碳分子的吸附動力學模式(pseudo-first-order kinetic model、pseudo-second-order kinetic model 與 intraparticle diffusion model)與等溫吸附模式(Freundlich 與 Langmuir 等溫吸附 模式)。活性碳吸附劑吸附二氧化碳氣體分子之實驗結果以pseudo-second-order kinetic model 有較好的線性關係。silica xerogel與aminosilane-modified silica吸附劑吸附二氧化碳氣體分子之 實驗結果,silica xerogel 以 pseudo-second-order kinetic model 有較好的線性關係, aminosilane-modified silica 以 intraparticle diffusion model 有較好的線性關係。計算之 值與實 驗&值較相近。三種吸附劑之等溫吸附模式,以Langmuir模式有較好的線性關係,且三種吸 附劑的也值均介於0<也<1時,為有利性吸附。
We investigated the adsorption kinetic models ( pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion models ) of carbon dioxide adsorbed on three adsorbents (activated carbon, silica xerogel, and amine-grafted silica xerogel) and evaluated isothermal adsorption models ( Freundlich and Langmuir models) . The experimental results for the adsorption of carbon dioxide gas on the active carbon adsorbents revealed that this model showed a strong linear relationship with the pseudo-second-order kinetic model. The silica xerogel and aminosilane-modified silica showed strong linear relationships with the pseudo-second-order kinetic and intraparticle diffusion models, respectively. The calculated qe values were close to the experimental qe values. The isothermal adsorption model of the three adsorbents showed a strong linear relationship with the Langmuir model, and the RL values of the three adsorbents were in the range of 0 <1, indicating favorable adsorption.