Kinetics Studies of CO2 Adsorption/Desorption on Amine-Functionalized Multiwalled Carbon Nanotubes

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• 作者：Qing Liu ; Junjie Shi ; Shudong Zheng ; Mengna Tao ; Yi He ; Yao Shi
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 23, 2014
• 年：2014
• 卷：53
• 期：29
• 页码：11677-11683
• 全文大小：412K
• ISSN：1520-5045

文摘

The adsorption/desorption kinetics of carbon dioxide on tetraethylenepentamine (TEPA) impregnated industrial grade multiwalled carbon nanotubes (IG-MWCNTs) was investigated to obtain insight into the underlying mechanisms on the fixed bed. After evaluating four kinetic models for CO₂ adsorption at various adsorption temperatures, CO₂ partial pressure, and amine loadings, it was found that Avrami鈥檚 fractional-order kinetic model provided the best fitting for the adsorption behavior of CO₂. In order to find the optimal regeneration method, three desorption methods were evaluated for the regeneration of solid sorbents. The activation energy E_a of CO₂ adsorption/desorption was calculated from Arrhenius equation and used to evaluate the performance of the adsorbent. The E_a decreased with increasing CO₂ concentration, indicating that CO₂ adsorption of amine-functionalized IG-MWCNTs is possibly intraparticle controlled. Meanwhile, because of the energy input of a vacuum pump, E_a for the vacuum swing regeneration method was less than that for temperature swing regeneration.