Water Adsorption in Porous Metal鈥揙rganic Frameworks and Related Materials

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• 作者：Hiroyasu Furukawa ; Felipe G谩ndara ; Yue-Biao Zhang ; Juncong Jiang ; Wendy L. Queen ; Matthew R. Hudson ; Omar M. Yaghi
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：March 19, 2014
• 年：2014
• 卷：136
• 期：11
• 页码：4369-4381
• 全文大小：864K
• 年卷期：v.136,no.11(March 19, 2014)
• ISSN：1520-5126

文摘

Water adsorption in porous materials is important for many applications such as dehumidification, thermal batteries, and delivery of drinking water in remote areas. In this study, we have identified three criteria for achieving high performing porous materials for water adsorption. These criteria deal with condensation pressure of water in the pores, uptake capacity, and recyclability and water stability of the material. In search of an excellently performing porous material, we have studied and compared the water adsorption properties of 23 materials, 20 of which are metal鈥搊rganic frameworks (MOFs). Among the MOFs are 10 zirconium(IV) MOFs with a subset of these, MOF-801-SC (single crystal form), 鈭?02, 鈭?05, 鈭?06, 鈭?08, 鈭?12, and 鈭?41 reported for the first time. MOF-801-P (microcrystalline powder form) was reported earlier and studied here for its water adsorption properties. MOF-812 was only made and structurally characterized but not examined for water adsorption because it is a byproduct of MOF-841 synthesis. All the new zirconium MOFs are made from the Zr₆O₄(OH)₄(鈭扖O₂)_n secondary building units (n = 6, 8, 10, or 12) and variously shaped carboxyl organic linkers to make extended porous frameworks. The permanent porosity of all 23 materials was confirmed and their water adsorption measured to reveal that MOF-801-P and MOF-841 are the highest performers based on the three criteria stated above; they are water stable, do not lose capacity after five adsorption/desorption cycles, and are easily regenerated at room temperature. An X-ray single-crystal study and a powder neutron diffraction study reveal the position of the water adsorption sites in MOF-801 and highlight the importance of the intermolecular interaction between adsorbed water molecules within the pores.