How Water Fosters a Remarkable 5-Fold Increase in Low-Pressure CO2 Uptake within Mesoporous MIL-100(Fe)

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• 作者：Estelle Soubeyrand-Lenoir ; Christelle Vagner ; Ji Woong Yoon ; Philippe Bazin ; Florence Ragon ; Young Kyu Hwang ; Christian Serre ; Jong-San Chang ; Philip L. Llewellyn
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：June 20, 2012
• 年：2012
• 卷：134
• 期：24
• 页码：10174-10181
• 全文大小：422K
• 年卷期：v.134,no.24(June 20, 2012)
• ISSN：1520-5126

文摘

The uptake and adsorption enthalpy of carbon dioxide at 0.2 bar have been studied in three different topical porous MOF samples, HKUST-1, UiO-66(Zr), and MIL-100(Fe), after having been pre-equilibrated under different relative humidities (3, 10, 20, 40%) of water vapor. If in the case of microporous UiO-66, CO₂ uptake remained similar whatever the relative humidity, and correlations were difficult for microporous HKUST-1 due to its relative instability toward water vapor. In the case of MIL-100(Fe), a remarkable 5-fold increase in CO₂ uptake was observed with increasing RH, up to 105 mg g^鈥? CO₂ at 40% RH, in parallel with a large decrease in enthalpy measured. Cycling measurements show slight differences for the initial three cycles and complete reversibility with further cycles. These results suggest an enhanced solubility of CO₂ in the water-filled mesopores of MIL-100(Fe).