Modulation of the Pore Environment in Pillar-Layered MOFs for One-Step Purification of Ethylene
Yi Wang , Jian Tan , Yongheng Ren , Yang Chen , Jinping Li , Libo Li
Chinese Journal of Chemistry ›› 2025, Vol. 43 ›› Issue (6) : 613 -619.
Modulation of the Pore Environment in Pillar-Layered MOFs for One-Step Purification of Ethylene
Due to the extremely similar physical and chemical properties of C 2H 6, C 2H 4, and C 2H 2, purifying ethylene from the C 2 ternary mixture in one-step is very challenging. In this work, we developed a series of pillar-layered MOF materials ((Ni(BTC)(Bipy), Ni(BTC)(3-Me-Bipy), and Ni(BTC)(3-NH 2-Bipy)) through the functionalization of pillar ligands using pore engineering strategies. Single-component adsorption isotherm measurements demonstrate that these materials preferentially adsorb C 2H 6 and C 2H 2, thereby achieving one-step purification of the three C 2 hydrocarbons to obtain C 2H 4. By introducing functional groups on the pillars, the selectivity for C 2H 6/C 2H 4 increased by over 10%, while the selectivity for C 2H 2/C 2H 4 increased by more than 300%. Specifically, Ni(BTC)(3-NH 2-Bipy) exhibits a selectivity of 1.5 for C 2H 6/C 2H 4 (50/50, V/ V) and 5.16 for C 2H 2/C 2H 4 (1/99, V/ V). Under ambient conditions, the adsorption capacity of Ni(BTC)(3-NH 2-Bipy) for C 2H 2 reached 121.6 cm 3/g, Ni(BTC)(3-NH 2-Bipy) exhibits superior C 2H 2 adsorption capacity and C 2H 2/C 2H 4 selectivity compared to many classic materials, including TJT-100, Azole-Th-1, and MOF-808-Bzz, commonly used for C 2H 4 purification from C 2 ternary mixtures. Dynamic breakthrough experiments indicate that in a ternary C 2 mixture, Ni(BTC)(3-NH 2-Bipy) preferentially captures C 2H 6 and C 2H 2, enabling one-step purification of C 2H 4.
Pillar-layered MOFs / Gas separation / Ethylene purification / Pore regulation / Adsorption / Crystal engineering / Strategies / Surface modification / Self-assembly
2024 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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