Fast Gas-Adsorption Kinetics in Supraparticle-Based MOF Packings with Hierarchical Porosity

Fujiwara A, Wang J, Hiraide S, Götz A, Miyahara MT, Hartmann M, Apeleo Zubiri B, Spiecker E, Vogel N, Watanabe S (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Advanced Materials Wiley

DOI: 10.1002/adma.202305980

Abstract

Metal–organic frameworks (MOFs) are microporous adsorbents for high-throughput gas separation. Such materials exhibit distinct adsorption characteristics owing to the flexibility of the crystal framework in a nanoparticle, which can be different from its bulk crystal. However, for practical applications, such particles need to be compacted into macroscopic pellets, creating mass-transport limitations. In this work, this problem is addressed by forming materials with structural hierarchy, using a supraparticle-based approach. Spherical supraparticles composed of nanosized MOF particles are fabricated by emulsion templating and they are used as the structural component forming a macroscopic material. Zeolitic imidazolate framework-8 (ZIF-8) particles are used as a model system and the gas-adsorption kinetics of the hierarchical material are compared with conventional pellets without structural hierarchy. It is demonstrated that a pellet packed with supraparticles exhibits a 30 times faster adsorption rate compared to an unstructured ZIF-8 powder pellet. These results underline the importance of controlling structural hierarchy to maximize the performance of existing materials. In the hierarchical MOFs, large macropores between the supraparticles, smaller macropores between individual ZIF-8 primary particles, and micropores inherent to the ZIF-8 framework collude to combine large surface area, defined adsorption sites, and efficient mass transport to enhance performance.

Authors with CRIS profile

Junwei Wang Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Alexander Götz Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Martin Hartmann Professur für Katalyse Benjamin Apeleo Zubiri Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Nicolas Vogel Lehrstuhl für Partikelsynthese

Related research project(s)

Support design for enhanced catalytic activity of SILP systems (B03) (SFB 1452 CLINT B03) Catalysis at Liquid Interfaces (CLINT) (SFB 1452 CLINT) Jan. 1, 2021 - Dec. 31, 2024

Involved external institutions

Kyoto University / 京都大学 Kyōto daigaku JP Japan (JP)

How to cite

APA:

Fujiwara, A., Wang, J., Hiraide, S., Götz, A., Miyahara, M.T., Hartmann, M.,... Watanabe, S. (2023). Fast Gas-Adsorption Kinetics in Supraparticle-Based MOF Packings with Hierarchical Porosity. Advanced Materials. https://dx.doi.org/10.1002/adma.202305980

MLA:

Fujiwara, Atsushi, et al. "Fast Gas-Adsorption Kinetics in Supraparticle-Based MOF Packings with Hierarchical Porosity." Advanced Materials (2023).

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