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

Jong Hyeak Choe, Jeoung Ryul Park, Yun Seok Chae, Dae Won Kim, Doo San Choi, Hyojin Kim, Minjung Kang, Hwimin Seo, Yong Ki Park, Chang Seop Hong

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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 CO2 adsorption capacity and stability. Here, we present a scalable synthesis method for Mg2(dobpdc) MOF and its shaped beads, which are obtained by using a spray dry method after mixing Mg2(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% CO2 capture and high hydrophobicity. The een-MOF/Al-Si microbeads retain their crystallinity and improved CO2 uptake upon exposure to humid conditions for three days at a desorption temperature of 140 °C.

Original languageEnglish
Article number3
JournalCommunications Materials
Volume2
Issue number1
DOIs
Publication statusPublished - 2021 Dec

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials

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