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等温线模型可以预测碳捕集系统的性能，但目前的吸附等温线模型研究存在特定温度、压力范围内拟合结果不佳的问题，影响预测结果的可靠性。通过制备物理吸附剂13X、胺基吸附剂PEI-NS、PEI-Al2O3、TRI-Al2O3,并将实测得到的等温线与Langmuir、Freundlich、Sips、Toth 4种等温线模型进行拟合，分析并得到各吸附剂在不同温度下适用等温线模型。在25℃吸附，13X用Sips模型的拟合结果较好，胺基吸附剂使用Sips或Toth模型的拟合结果较好。对于胺基吸附剂PEI-NS、TRI-Al2O3,受到CO2物理吸附作用的影响大，使用单一等温线模型的拟合结果较差，针对该问题，提出分段拟合方法，在低压范围内的R2高于0.99,足以用于空气碳捕集的工况(大气中CO2压力约为0.4 mbar),证明该方法有助于大幅提升等温线模型拟合结果的精确性。
Abstract：The isotherm model can predict the performance of the carbon capture system. However, in the current research on the adsorption isotherm model, there is a problem of poor fitting results within specific temperature and pressure ranges, which affects the reliability of the prediction results. By preparing physical adsorbents 13X, amine-modified adsorbents PEI-NS, PEI-Al2O3, and TRI-Al2O3, and fitting the measured isotherms with four isotherm models of Langmuir, Freundlich, Sips, and Toth, the applicable isotherm models of each adsorbent at different temperatures were analyzed and obtained. Adsorption at 25 ℃, the fitting of 13X using the Sips model is better, and the fitting of amine-modified adsorbents using the Sips or Toth model is better. For the amine-modified adsorbents PEI-NS and TRI-Al2O3, they are greatly affected by the physical adsorption effect of CO2, and the fitting result using the single isotherm model is poor. To address this problem, a segmented fitting method is proposed, and the R2 in the low-pressure range is higher than 0.99. The working conditions sufficient for air carbon capture(the pressure of CO2 in the atmosphere is approximately 0.4 mbar), proving that this method is helpful to significantly improve the accuracy of the isotherm model fitting results.
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基本信息:
DOI：10.16152/j.cnki.xdxbzr.2025-05-011
中图分类号:X701;TQ424
引用信息:
[1]陈彦霖,周爱国,郑家乐,等.CO_2吸附剂制备及吸附等温线模型研究[J].西北大学学报(自然科学版),2025,55(05):1074-1084.DOI:10.16152/j.cnki.xdxbzr.2025-05-011.
基金信息:
国家自然科学基金(52376011); 中国石油集团科技项目(2022DJ6607)