Application of IAST in the Prediction of Multicomponent Adsorption Equilibrium of Gases in Heterogeneous Solids: Micropore Size Distribution versus Energy Distribution

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• 作者：Kean Wang ; Shizhang Qiao ; and Xijun Hu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2000
• 出版时间：February 2000
• 年：2000
• 卷：39
• 期：2
• 页码：527 - 532
• 全文大小：78K
• 年卷期：v.39,no.2(February 2000)
• ISSN：1520-5045

文摘

This article investigates the effect of surface heterogeneity and energy-matching scheme on theprediction of adsorption equilibria on activated carbon. The ideal adsorbed solution theory (IAST)is employed to evaluate the local adsorption equilibria on each energy site while the energeticheterogeneity of the system is represented by two forms: (1) uniform energy distribution, whichemploys the cumulative energy scheme to match different adsorbates in the adsorbed phase;and (2) micropore size distribution, which invokes the adsorbate-pore interaction matchingscheme. The adsorption equilibria of hydrocarbon gas mixtures measured on two commercialactivated carbons are used to compare the two models. It is found that uniform energy distributioncan be insufficient in the prediction of multicomponent adsorption equilibria. On the other hand,the model assuming micropore size distribution as adsorption energetic heterogeneity and theadsorbate-pore interaction energy-matching scheme presents relatively stable prediction results.