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    Porous liquid metal-organic frameworks with selectively high gas solubility

    Year: 2023

    Journal: Fuel, Volume 344, 2023-07-15, page 128051

    Authors: Ma, Jie; He, Libo; Yang, Ruilu; Wang, Dechao; Qu, Danyao; Su, Chen; Pang, Haili; Wu, Weiwei; Li, Peipei; Zhang, Lu; Liu, Xiaowei

    Keywords: Hydrophilicity; Ionic liquid; Permanent porosity; Porous liquid; Selective gas solubility

    Porous liquid metal–organic frameworks (MOFs) have recently been discovered rather promising for gas absorption and separation in practical chemical industry processes. In this work, we successfully fabricated a kind of MOF-based porous liquid (i.e., UIO-66-PL) by dispersing the hydrophilic porous filler of UIO-66-NH2 nanoparticles into a specific hydrophilic ionic liquid (IL, [HEMIM][DCA]) through the wet-impregnation method. The obtained UIO-66-PL was a kind of stable porous liquid with well-maintained permanent porosity and liquid-like behavior at room temperature. More importantly, this UIO-66-PL has larger gas absorption capacities than its reference IL hindered solvent as the well-preserved permanent porosity could act as free void space for gas accommodation. Also, IL could serve as a selective gate for target gas to the permanent porosity within UIO-66-PL, i.e., the majority of the permanent porosity in UIO-66-PL is inaccessible to nitrogen, but available for carbon dioxide, demonstrating that this UIO-66-PL could function as a type of fluid selective gas sorbent with high target gas solubility.
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