Hierarchical MOF-xerogel monolith composites from embedding MIL-100(Fe,Cr) and MIL-101(Cr) in resorcinol-formaldehyde xerogels for water adsorption applications
Hierarchical MOF-xerogel monolith composites from embedding MIL-100(Fe,Cr) and MIL-101(Cr) in resorcinol-formaldehyde xerogels for water adsorption applications
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DOI：
10.1016/j.micromeso.2015.05.017
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发表时间：
2015-10
影响因子：
5.2
通讯作者：
Martin Wickenheisser;A. Herbst;René Tannert;B. Milow;C. Janiak
中科院分区：
文献类型：
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作者：
Martin Wickenheisser;A. Herbst;René Tannert;B. Milow;C. Janiak
粉末状金属有机骨架材料的成型是将其推向应用阶段的一个越来越重要的问题。使用微-介孔MIL-100（Fe，Cr）和MIL-101（Cr）作为热稳定和化学稳定的MOFs，与介孔间苯二酚-甲醛基干凝胶一起作为粘合剂，合成整体式MOFs复合材料。通过预聚合的干凝胶溶液，在保留MIL表面积和孔隙率（来自N2吸附）的情况下，单块体可以负载高达77重量%的粉末状MIL材料。所获得的整料是机械稳定的，并且根据MIL重量百分比吸附接近预期的水蒸气量。尤其是MIL-101（Cr）复合材料的BET表面积、孔隙率和吸水能力没有损失。水蒸气吸附等温线显示，与纯MIL-101（Cr）相比，负载77重量% MIL-101（Cr）的复合材料甚至具有略微增加的水蒸气吸收，直至相对蒸气压P· P 0− 1= 0.5。这些亲水性单片复合材料可用于热转换应用，如热驱动吸附式制冷机或吸附式热泵。
Shaping of otherwise powdery metal-organic frameworks is recognized as a more-and-more important issue to advance them to the application stage. Monolithic MOF composites were synthesized using micro-to-mesoporous MIL-100 (Fe, Cr) and MIL-101 (Cr) as thermally and chemically stable MOFs together with a mesoporous resorcinol-formaldehyde based xerogel as binding agent. The monolithic bodies could be loaded with up to 77 wt% of powdery MIL material under retention of the MIL surface area and porosities (from N 2 adsorption) by pre-polymerization of the xerogel solution. The obtained monoliths are mechanically stable and adsorb close to the expected water vapor amount according to the MIL weight percentage. There is no loss of BET surface area, porosity and water uptake capacity especially for the MIL-101 (Cr) composites. Water vapor adsorption isotherms show that the 77 wt% MIL-101 (Cr) loaded composite even features a slightly increased water vapor uptake compared to pure MIL-101 (Cr) up to a relative vapor pressure of P· P 0− 1= 0.5. These hydrophilic monolithic composites could be applied for heat transformation application such as thermally driven adsorption chillers or adsorption heat pumps.