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Kim, Dae Won; Kang, Dong Won; Kang, Minjung; Lee, Jung‐Hoon; Choe, Jong Hyeak; Chae, Yun Seok; Choi, Doo San; Yun, Hongryeol; Hong, Chang Seop
Angewandte Chemie International Edition, December 7, 2020, Letnik: 59, Številka: 50Journal Article
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. A metal–organic framework adsorbent with open metal sites is presented. It has record high capacities over a wide range of NH3 concentrations as well as an exceptional stability upon exposure to wet NH3.
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