3D hierarchical porous MOF-74 based structured adsorbent for gas-phase dynamic separations

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Abstract

With the present society’s focus towards carbon capture using adsorption processes, Mg-MOF-74 is a distinct reticular material which exhibits distinguished CO2 adsorption capacity and selectivity due to
the open metal sites in the hexagonal channels aligned along the c-axis[1]. Commonly, synthesis of MOF- 74 involve use of organic solvents such as dimethylformamide (DMF)[2,3] and Tetrahydrofuran (THF)[4,5] at high temperatures. In the literature, though Sánchez-Sánchez et.al. have informed synthesis of Zn-MOF-74 in an aqueous media[6], here we report synthesis of Mg-MOF-74 crystals, for the first time, in the aqueous media and room temperature, based on the approach of alkaline-based salts of organic linker. Additionally, though material-focused development work is necessary for the
separation processes, integration of these porous materials into fixed bed systems for efficient separation is also essential. Therefore, employing melamine sponge (MS) as a 3D hierarchical permeable support, without any pre-treatment/additive, Mg-MOF-74@MS composite was synthesized and investigated, for the first time, for gas-phase dynamic separations. SEM image of the composite revealed self-assembly of nanocrystals over the 3D skeleton surface (Fig. 1a). Next, breakthrough experiments with mixtures
of 20% CO2 and 80% CH4 were performed at 1 bar and 298 K (Fig. 1b). Owing to the spatial structure of the sponge, the composite retained the adsorption properties of Mg-MOF-74 for CO2 capture i.e., high dynamic capacity, high selectivity, and facile regeneration and showed high permeability (low
pressure drop), thus presenting melamine sponge-based MOF structured adsorbent as a potential candidate for gas-phase separation applications.

References
[1] J. H. Choe, H. Kim, C. S. Hong, Mater. Chem. Front. 2021, 5172.
[2] C. Xin, Y. Ren, Z. Zhang, L. Liu, X. Wang, J. Yang, ACS Omega 2021, 6, 7739.
[3] Z. Y. Yao, J. H. Guo, P. Wang, Y. Liu, F. Guo, W. Y. Sun, Mater. Lett. 2018, 223, 174.
[4] F. Rezaei, S. Lawson, H. Hosseini, H. Thakkar, A. Hajari, S. Monjezi, A. A. Rownaghi, Chem. Eng. J. 2017, 313, 1346.
[5] S. Lawson, F. Rezaei, ACS Sustain. Chem. Eng. 2021, 9, 10902.
[6] M. Sánchez-Sánchez, N. Getachew, K. Díaz, M. Díaz-García, Y. Chebude, I. Díaz, Green Chem. 2015, 17, 1500.
Original languageEnglish
Title of host publication2022 French MOFs, COFs and Porous Polymers conference
Subtitle of host publicationProgram and Abstract Book
Place of PublicationMontpellier, France
PublisherPresses Universitaires de Montpellier
Pages33-33
Number of pages1
Publication statusPublished - Jun 2022
Event2022 French MOFs, COFs and Porous Polymers conference (French MOF 2022) - Montpellier, France
Duration: 8 Jun 20229 Jun 2022
https://www.coudert.name/French_MOF_2022.html

Conference

Conference2022 French MOFs, COFs and Porous Polymers conference (French MOF 2022)
Abbreviated titleFrench MOF 2022
Country/TerritoryFrance
CityMontpellier
Period8/06/229/06/22
Internet address

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