Details

Autor(en) / Beteiligte

• Xue, Ying‐Ying
• Bai, Xiao‐Ying
• Zhang, Jing
• Wang, Ying
• Li, Shu‐Ni
• Jiang, Yu‐Cheng
• Hu, Man‐Cheng
• Zhai, Quan‐Guo

Titel

Precise Pore Space Partitions Combined with High‐Density Hydrogen‐Bonding Acceptors within Metal–Organic Frameworks for Highly Efficient Acetylene Storage and Separation

Ist Teil von

• Angewandte Chemie International Edition, 2021-04, Vol.60 (18), p.10122-10128

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The high storage capacity versus high selectivity trade‐off barrier presents a daunting challenge to practical application as an acetylene (C2H2) adsorbent. A structure–performance relationship screening for sixty‐two high‐performance metal–organic framework adsorbents reveals that a moderate pore size distribution around 5.0–7.5 Å is critical to fulfill this task. A precise pore space partition approach was involved to partition 1D hexagonal channels of typical MIL‐88 architecture into finite segments with pore sizes varying from 4.5 Å (SNNU‐26) to 6.4 Å (SNNU‐27), 7.1 Å (SNNU‐28), and 8.1 Å (SNNU‐29). Coupled with bare tetrazole N sites (6 or 12 bare N sites within one cage) as high‐density H‐bonding acceptors for C2H2, the target MOFs offer a good combination of high C2H2/CO2 adsorption selectivity and high C2H2 uptake capacity in addition to good stability. The optimized SNNU‐27‐Fe material demonstrates a C2H2 uptake of 182.4 cm3 g−1 and an extraordinary C2H2/CO2 dynamic breakthrough time up to 91 min g−1 under ambient conditions. Benchmark metal–organic framework (MOF) adsorbents for C2H2/CO2 separation are reported. The MOFs offer moderate pore size distributions, which are regulated by precise pore space partitions and coupled with a high‐density of hydrogen‐bonding acceptors.