Citation: Yao-Yu Ma, Wen-Juan Shi, Gang-Ding Wang, Xin Liu, Lei Hou, Yao-Yu Wang. Enhancing ethane/ethylene separation performance through the amino-functionalization of ethane-selective MOF[J]. Chinese Chemical Letters, ;2025, 36(3): 109729. doi: 10.1016/j.cclet.2024.109729 shu

Enhancing ethane/ethylene separation performance through the amino-functionalization of ethane-selective MOF

Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, China

swjuan2000@126.com

lhou2009@nwu.edu.cn

Received Date: 26 December 2023
Revised Date: 29 January 2024
Accepted Date: 23 February 2024
Available Online: 9 March 2024

Figures(9)

The utilization of ethane-selective materials for adsorption-based separation technology presents an energy-efficient alternative to cryogenic distillation for ethylene (C₂H₄) purification from ethane (C₂H₆). To study the relations between separation performance and pore environments, we carried out the isoreticular chemistry rule to introduce the -NH₂ groups into a C₂H₆-selective MOF [Cu_1.5(BTC)(DPU)_1.5(H₂O)_1.5], and successfully improved the adsorption capacity and selectivity for C₂H₆ over C₂H₄. The NH₂-functionalized MOF [Cu_1.5(NH₂-BTC)(DPU)_1.5(H₂O)_1.5] with a relatively narrow pore not only forms appropriate pore restriction but also provides additional binding sites to enhance the adsorption capacity of C₂H₆ relative to C₂H₄. Both gas adsorption and dynamic breakthrough results indicated that the -NH₂ functionalization significantly enhanced the separation performance of materials for C₂H₆/C₂H₄ mixtures, allowing the production of C₂H₄ with a purity of over 99.99% and a productivity of up to 30.02 L/kg in one step. Theoretical calculations revealed that the synergistic effect of appropriate pore confinement and NH₂-modified functional surfaces imposed stronger interactions on C₂H₆ than C₂H₄.
- Metal-organic framework,
- Amino-functionalization,
- Gas adsorption,
- Adsorption selectivity,
- Separation
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