Shaping and silane coating of a diamine-grafted metal-organic framework for improved CO2 capture

Although metal-organic framework (MOF) powders can be successfully shaped by conventional methods, postsynthetic functionalization of the shaped MOFs remains almost unexplored, yet is required to overcome intrinsic limitations, such as CO 2 adsorption capacity and stability. Here, we present a scala...

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Bibliographic Details
Published in:Communications materials 2021-01, Vol.2 (1), p.1-8, Article 3
Main Authors: Choe, Jong Hyeak, Park, Jeoung Ryul, Chae, Yun Seok, Kim, Dae Won, Choi, Doo San, Kim, Hyojin, Kang, Minjung, Seo, Hwimin, Park, Yong-Ki, Hong, Chang Seop
Format: Article
Language:English
Subjects:
639/638/169/824
639/638/263/915
639/638/298/921
639/638/898
Aluminum oxide
Beads
Carbon dioxide
Carbon sequestration
Chemistry and Materials Science
Coating
Diamines
Hydrophobicity
Materials Science
Metal-organic frameworks
Nanoparticles
Particle size distribution
Silanes
Silicon
Synthesis
Work capacity
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Summary:Although metal-organic framework (MOF) powders can be successfully shaped by conventional methods, postsynthetic functionalization of the shaped MOFs remains almost unexplored, yet is required to overcome intrinsic limitations, such as CO 2 adsorption capacity and stability. Here, we present a scalable synthesis method for Mg 2 (dobpdc) MOF and its shaped beads, which are obtained by using a spray dry method after mixing Mg 2 (dobpdc) powders with alumina sol. The synthesized MOF/Al beads have micron-sized diameters with a moderate particle size distribution of 30–70 μm. They also maintain a high mechanical strength. N-ethylethylenediamine (een) functionalization and coating with long alkyl chain silanes results in een-MOF/Al-Si, which exhibits a significant working capacity of >11 wt% CO 2 capture and high hydrophobicity. The een-MOF/Al-Si microbeads retain their crystallinity and improved CO 2 uptake upon exposure to humid conditions for three days at a desorption temperature of 140 °C. Metal organic frameworks (MOFs) are promising for CO 2 capture. Here, the Mg 2 (dobpdc) MOF is synthesized as micron-sized beads with a silane coating resulting in > 11 wt% CO 2 absorption, which is retained after three days in a humid environment at 140 °C.
ISSN:2662-4443
2662-4443
DOI:10.1038/s43246-020-00109-8