Reprint of: CO₂/CH₄, CH₄/H₂ and CO₂/CH₄/H₂ separations at high pressures using Mg₂(dobdc)

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• 作者：Zoey R. Herm ; Rajamani Krishna ; ¹ ; ^{r.krishna@uva.nl} ; Jeffrey R. Long ; ^{jrlong@berkeley.edu}
• 关键词：Metal&ndash ; organic framework ; Carbon capture ; Mg2(dobdc) ; Hydrogen purification ; Natural gas purification
• 刊名：Microporous and Mesoporous Materials
• 出版年：2012
• 期刊代码：78_13871811
• 类别：ch
• 出版时间：15 July, 2012
• 卷：157
• 期：Complete
• 页码：94-100
• 文件大小：731 K

摘要

High-pressure separations of binary and ternary mixtures of CO₂, CH₄, and H₂ are relevant to carbon dioxide capture as well as hydrogen and natural gas purification. Metal-organic frameworks represent a class of porous materials that could be used to accomplish these separations, and Mg₂(dobdc) (dobdc^{4鈭?/sup> = 1,4-dioxido-2,5-benzenedicarboxylate), also sometimes referred to as Mg-MOF-74 or CPO-27-Mg, is an especially lightweight metal-organic framework with a high concentration of coordinatively-unsaturated metal sites decorating its interior surfaces. High pressure CH₄ adsorption isotherms presented here, together with CO₂ and H₂ adsorption behavior, are analyzed using the Ideal Adsorbed Solution Theory to model CO₂/CH₄, CH₄/H₂, and CO₂/CH₄/H₂ mixture separations using Mg₂(dobdc). The selectivities, working capacities and breakthrough performances for these three mixtures are reported, and Mg₂(dobdc) is shown to outperform zeolite 13X in each scenario.}