Stability Effects on CO2 Adsorption for the DOBDC Series of Metal鈥揙rganic Frameworks

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• 作者：Jian Liu ; Annabelle I. Benin ; Amanda M. B. Furtado ; Paulina Jakubczak ; Richard R. Willis ; M. Douglas LeVan
• 刊名：Langmuir
• 出版年：2011
• 出版时间：September 20, 2011
• 年：2011
• 卷：27
• 期：18
• 页码：11451-11456
• 全文大小：816K
• 年卷期：v.27,no.18(September 20, 2011)
• ISSN：1520-5827

文摘

Metal鈥搊rganic frameworks with unsaturated metal centers in their crystal structures, such as Ni/DOBDC and Mg/DOBDC, are promising adsorbents for carbon dioxide capture from flue gas due to their high CO₂ capacities at subatmospheric pressures. However, stability is a critical issue for their application. In this paper, the stabilities of Ni/DOBDC and Mg/DOBDC are investigated. Effects of steam conditioning, simulated flue gas conditioning, and long-term storage on CO₂ adsorption capacities are considered. Results show that Ni/DOBDC can maintain its CO₂ capacity after steam conditioning and long-term storage, whereas Mg/DOBDC does not. Nitrogen isotherms for Mg/DOBDC show a drop in surface area after steaming, corresponding to the decrease in CO₂ adsorption, which may be caused by a reduction of unsaturated metal centers in its structure. Conditioning with dry simulated flue gas at room temperature only slightly affects CO₂ adsorption in Ni/DOBDC. However, introducing water vapor into the simulated flue gas further reduces the CO₂ capacity of Ni/DOBDC.