Authors
Zhu-Lin Li, Shan-Shan Wang, Guang-Li Zhu, Cai-Feng Tang, Yu-Jie Liang, Bo Huang, Ai-Xin Zhu
Published in
Inorganic chemistry. Volume 65. Issue 36. Pages 21305-21313. Sep 14, 2026.
Abstract
The efficient separation of acetylene (C2H2) from carbon dioxide (CO2) and ethylene (C2H4) is critical for producing high-purity chemical feedstocks but remains challenging due to their similar physicochemical properties. The development of functional metal-organic frameworks (MOFs) featuring superior selectivity for both C2H2/CO2 and C2H2/C2H4 mixtures is quite necessary. Herein, we synthesized a novel 4-fold interpenetrated flexible MOF (Zn-MOF-α) that exhibits a reversible solid-state structural transformation upon guest removal/uptake. After activation, Zn-MOF-α (featuring 2D cavities) converts to Zn-MOF-β (with 0D voids) accompanied by the rotation of the organic linkers and the contraction of interstitial spaces. Notably, Zn-MOF-β features unique temperature-dependent gate-opening effects toward C2 gases. At 298 K and 1 bar, it exhibits high selectivities of 15.7 for equimolar C2H2/CO2 and 15.2 for equimolar C2H2/C2H4, outperforming many previously reported MOFs. Dynamic breakthrough experiments further confirm its excellent separation performance for binary mixtures (C2H2/CO2 and C2H2/C2H4) under various conditions, demonstrating efficient recovery of high-purity C2H2 with remarkable cyclic stability. This work provides a promising adsorbent for challenging gas separation and offers a rational design strategy for advanced MOF materials.
PMID:
42734379
Bibliographic data and abstract were imported from PubMed on 14 Sep 2026.
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