当前位置: X-MOL 学术J. Clust. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Modeling of CO2 Adsorption Isotherms, Kinetics and Thermodynamics Equilibrium, and the Brunauer−Emmett−Teller Analysis onto KO2 Pellets
Journal of Cluster Science ( IF 2.7 ) Pub Date : 2021-08-12 , DOI: 10.1007/s10876-021-02142-0
Asma Chegeni 1 , Valiollah Babaeipour 1 , Manoochehr Fathollahi 1 , Seyed Ghorban Hosseini 1
Affiliation  

In this research, KO2 pellets as a solid adsorbent have been evaluated for the CO2 adsorption process. The KO2 pellets with advantages in CO2 uptake, besides O2 production, have been considered as air revitalization components, especially for closed respiratory environments in the infrastructure of life support systems (LSS). A unique set of experimental data of a single adsorption equilibrium of CO2 on KO2 pellet adsorbents at concentrations 8500–9500 mg L−1 (as closed atmosphere with a CO2% high value due to respiratory of human) and temperature 298.15 K is reported. Operating parameters such as temperature and humidity are tested experimentally to check the adsorption capacity. The maximum adsorption capacity at a temperature of 20 °C and humidity of 70% was 660 and 620 mg g−1, respectively. The kinetic study showed that the CO2 adsorption data correctly are adjusted by the Rate-controlling model with an R2 value of 0.984. The calculated thermodynamic parameters such as entropy (-0.0277 kJ mol−1 K−1), enthalpy (-12.406 kJ mol−1), and Gibbs free energy changes (-4.136 kJ mol−1) indicate the spontaneous and exothermic of the process. Equilibrium adsorption data were placed in the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherms. Based on the regression coefficient (R2), the Dubinin-Radushkovich model provides a complete fit with the experimental data (R2 = 0.989). The BET-specific surface area of the KO2 pellets before and after the CO2 adsorption process was about 1.26 and 1.19 m2 g−1, respectively.



中文翻译:

CO2 吸附等温线、动力学和热力学平衡的建模,以及对 KO2 颗粒的 Brunauer-Emmett-Teller 分析

在这项研究中,已经针对 CO 2吸附过程评估了作为固体吸附剂的KO 2颗粒。除了生产O 2外,在 CO 2吸收方面具有优势的 KO 2颗粒被认为是空气再生组件,特别是对于生命支持系统 (LSS) 基础设施中的封闭呼吸环境。一组独特的 CO 2在浓度为 8500–9500 mg L -1 的KO 2颗粒吸附剂上的单一吸附平衡的实验数据(作为具有 CO 2% 高值由于人类呼吸)和温度 298.15 K 报告。通过实验测试温度和湿度等操作参数以检查吸附能力。在20°C 的温度和70% 的湿度下的最大吸附容量分别为660 和620 mg g -1。动力学研究表明,CO 2吸附数据通过速率控制模型正确调整,R 2值为0.984。计算出的热力学参数,例如熵 (-0.0277 kJ mol -1  K -1 )、焓 (-12.406 kJ mol -1 ) 和吉布斯自由能变化 (-4.136 kJ mol -1) 表示过程的自发和放热。平衡吸附数据置于 Langmuir、Freundlich、Dubinin-Radushkevich 和 Temkin 等温线中。基于回归系数 (R 2 ),Dubinin-Radushkovich 模型提供了与实验数据的完全拟合 (R 2  = 0.989)。CO 2吸附过程前后的KO 2颗粒的BET比表面积分别为约1.26和1.19 m 2  g -1

更新日期:2021-08-19
down
wechat
bug