High Ammonia Uptake of a Metal–Organic Framework Adsorbent in a Wide Pressure Range

Dae Won Kim, Dong Won Kang, Minjung Kang, Jung Hoon Lee, Jong Hyeak Choe, Yun Seok Chae, Doo San Choi, Hongryeol Yun, Chang Seop Hong

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Although numerous porous adsorbents have been investigated for NH3 capture applications, these materials often exhibit insufficient NH3 uptake, low NH3 affinity at the ppm level, and poor chemical stability against wet NH3 conditions. The NH3 capture properties of M2(dobpdc) complexes (M=Mg2+, Mn2+, Co2+, Ni2+, and Zn2+; dobpdc4−=4,4-dioxidobiphenyl-3,3-dicarboxylate) that contain open metal sites is presented. The NH3 uptake of Mg2(dobpdc) at 298 K was 23.9 mmol g−1 at 1 bar and 8.25 mmol g−1 at 570 ppm, which are record high capacities at both pressures among existing porous adsorbents. The structural stability of Mg2(dobpdc) upon exposure to wet NH3 was superior to that of the other M2(dobpdc) and the frameworks tested. Overall, these results demonstrate that Mg2(dobpdc) is a recyclable compound that exhibits significant NH3 affinity and capacity, making it a promising candidate for real-world NH3-capture applications.

Original languageEnglish
Pages (from-to)22531-22536
Number of pages6
JournalAngewandte Chemie - International Edition
Volume59
Issue number50
DOIs
Publication statusPublished - 2020 Dec 7

Keywords

  • adsorption
  • ammonia capture
  • metal–organic frameworks
  • open metal sites
  • porosity

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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