Synthesis of CO<sub>2</sub> adsorbent and research on adsorption isotherm model

CHEN Yanlin; ZHOU Aiguo; ZHENG Jiale; GE Tianshu

doi:10.16152/j.cnki.xdxbzr.2025-05-011

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Synthesis of CO₂ adsorbent and research on adsorption isotherm model

更新时间：2025-10-31

- Synthesis of CO₂ adsorbent and research on adsorption isotherm model
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 5, Pages: 1074-1084(2025)
- 作者机构：
  
  1.中国石油集团安全环保技术研究院有限公司，北京　102206
  2.上海交通大学　制冷与低温工程研究所，上海　200240
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-05-011
  CLC： X701
- Received：30 October 2024，
  
  Published：25 October 2025
- 稿件说明：
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CHEN Yanlin, ZHOU Aiguo, ZHENG Jiale, et al. Synthesis of CO₂ adsorbent and research on adsorption isotherm model[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1074-1084.
DOI：

CHEN Yanlin, ZHOU Aiguo, ZHENG Jiale, et al. Synthesis of CO₂ adsorbent and research on adsorption isotherm model[J]. Journal of northwest university (natural science edition), 2025, 55(5): 1074-1084. DOI： 10.16152/j.cnki.xdxbzr.2025-05-011.

摘要

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-Al

、TRI-Al

，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-Al

，受到CO

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

高于0.99，足以用于空气碳捕集的工况（大气中CO

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-Al

and TRI-Al

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-Al

they are greatly affected

by the physical adsorption effect of CO

and the fitting result using the single isotherm model is poor. To address this problem

a segmented fitting method is proposed

and the

in the low-pressure range is higher than 0.99. The working conditions sufficient for air carbon capture (the pressure of CO

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.

关键词

Keywords

references

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⁰

Synthesis of CO2 adsorbent and research on adsorption isotherm model

DOI：10.16152/j.cnki.xdxbzr.2025-05-011

摘要

Abstract

关键词

Keywords

references

Synthesis of CO₂ adsorbent and research on adsorption isotherm model