Complexity behind CO2 Capture on NH2-MIL-53(Al)

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• 作者：Eli Stavitski ; Evgeny A. Pidko ; Sarah Couck ; Tom Remy ; Emiel J. M. Hensen ; Bert M. Weckhuysen ; Joeri Denayer ; Jorge Gascon ; Freek Kapteijn
• 刊名：Langmuir
• 出版年：2011
• 出版时间：April 5, 2011
• 年：2011
• 卷：27
• 期：7
• 页码：3970-3976
• 全文大小：908K
• 年卷期：v.27,no.7(April 5, 2011)
• ISSN：1520-5827

文摘

Some Metal Organic Frameworks (MOFs) show excellent performance in extracting carbon dioxide from different gas mixtures. The origin of their enhanced separation ability is not clear yet. Herein, we present a combined experimental and theoretical study of the amino-functionalized MIL-53(Al) to elucidate the mechanism behind its unusual high efficiency in CO₂ capture. Spectroscopic and DFT studies point out only an indirect role of amine moieties. In contrast to other amino-functionalized CO₂ sorbents, no chemical bond between CO₂ and the NH₂ groups of the structure is formed. We demonstrate that the functionalization modulates the 鈥渂reathing鈥?behavior of the material, that is, the flexibility of the framework and its capacity to alter the structure upon the introduction of specific adsorbates. The absence of strong chemical interactions with CO₂ is of high importance for the overall performance of the adsorbent, since full regeneration can be achieved within minutes under very mild conditions, demonstrating the high potential of this type of adsorbents for PSA like systems.