A pacs-type metal–organic framework with high adsorption capacity for inverse C2H6/C2H4 separation

• Published in: New journal of chemistry 2024-06, Vol.48 (23), p.10577-10583
• Main Authors: Zhang, Kuo, Jing-Jing Pang, Lian, Xin, Zi-Han, Song, Yue-Chao, Yuan, Huang, Hongliang, Zhao-Quan, Yao, Xu, Jian
• Format: Article
• Language: English
• Subjects: Adsorption; Adsorptivity; Binary mixtures; Binding sites; Dicarboxylic acids; Ethane; Metal-organic frameworks; Pore size; Purification; Selectivity; Separation
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d4nj00605d

Separation of the mixture of ethylene (C2H4) and ethane (C2H6) to produce polymer-grade C2H4 is of prime importance in the petrochemical industry. In this context, metal–organic frameworks (MOFs) featuring tunable pore metrics and surface chemistry, especially those with inverse C2H6/C2H4 adsorption selectivity, hold great promise in energy-effective purification of C2H4 by adsorptive separation, but often encounter the well-known trade-off between adsorption selectivity and capacity. In this work, we report two new MOFs by deploying the pore-space-partition (PSP) strategy for the purpose of reducing the pore aperture size while retaining the gas-accessible pore volume. As a result, Ni-bodc-tpt (bodc = bicyclo[2.2.2]octane-1,4-dicarboxylic acid, tpt = 2,4,6-tri(4-pyridyl)-1,3,5-triazine) by combining optimal pore size, large cage pore volume, and rich C–H binding sites exhibits concurrently high C2H6 adsorption capacity (131.65 cm3 g−1) and C2H6/C2H4 selectivity (1.8) at 298 K and 1 bar, which is superior or comparable to many benchmark C2H6-selective MOFs. A dynamic breakthrough experiment demonstrates that high-purity C2H4 (>99.9%) can be harvested in one step from a binary mixture of C2H6/C2H4 (50/50, v/v), attesting to the feasibility of this new MOF as a prospective C2H4 purification agent.