Adsorption of CO₂, CO, CH₄ and N₂ on a zinc based metal organic framework

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• 作者：Prashant Mishra^a ; ^{m.prashant@iitg.ernet.in} ; Samuel Mekala^a ; Freider Dreisbach^b ; ^{dreisbach@rubotherm.de} ; Bishnupada Mandal^a ; ^{bpmandal@iitg.ernet.in} ; Sasidhar Gumma^a ; ^{s.gumma@iitg.ernet.in}
• 关键词：CO2 separation ; Adsorption ; Metal organic framework ; ZnDABCO ; Adsorption enthalpy
• 刊名：Separation and Purification Technology
• 出版年：2012
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：19 June, 2012
• 卷：94
• 期：Complete
• 页码：124-130
• 文件大小：442 K

摘要

In this work, we report the gas adsorption properties of a zinc based metal organic framework, (Zn₂(bdc)₂(dabco)(H₂O)_0.5(DMF)₄), more commonly known as ZnDABCO. Equilibrium adsorption isotherms for four industrially relevant gases (CO₂, CO, CH₄ and N₂) were measured up to 26 bar at three different temperatures (294, 314 and 350 K) using a standard gravimetric method. The isotherms were modeled using modified virial equation. Ideal Adsorbed Solution Theory (IAST) was used to predict selectivity of binary mixtures. The results indicate that absence of open metal centers in the ZnDABCO framework, results in lower capacities and adsorption enthalpies when compared to MOFs like CuBTC and MIL-101. The small values of adsorption enthalpy and Henry constant should make it easier to regenerate the adsorbent. IAST predicts an increase in the selectivity of CO₂ over the other three gases, with increasing pressure and CO₂ mole-fraction; this phenomenon is attributed to the increase in lateral interactions between the adsorbed CO₂ molecules. IAST predictions also indicate that this framework shows selectivity for CH₄ over CO.