Electro‐field alignment in a novel metal–organic framework for benchmark separation of ethylene from a ternary gas mixture
Lingmin Wang, Yan Zhang, Peixin Zhang, Xing Liu, Hanting Xiong, Rajamani Krishna, Junhui Liu, Shuai Hua, Pengxiang Wang, Zhenyu Zhou, Jingwen Chen, Shixia Chen, Shuguang Deng, Jun Wang
Abstract
Abstract One‐step separation of C 2 H 4 from ternary gas mixtures containing acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), and carbon dioxide (CO 2 ) represents a great challenge in chemical industry. Herein, we report the electro‐field alignment in a novel anion‐pillared MOF (SIFSIX‐TEPE‐Cu) for benchmark C 2 H 4 separation from C 2 H 2 /CO 2 /C 2 H 4 gas mixtures. The semi‐cage cavities featuring capped facets generated negative potentials along anion pillars and compensatory positive‐charged electro‐fields along organic ligands (TEPE) that facilitate specific recognitions of C 2 H 2 and CO 2 over C 2 H 4 . As a result, SIFSIX‐TEPE‐Cu exhibits high adsorption capacities for C 2 H 2 (123 cm 3 g −1 ) and CO 2 (65 cm 3 g −1 ) at 1.0 bar and 298 K. Notably, the record‐high C 2 H 2 uptake (78 cm 3 g −1 ) at 0.01 bar and remarkable C 2 H 2 /C 2 H 4 selectivity (615.2) renders benchmark trace C 2 H 2 removal ability. Dynamic breakthrough experiments demonstrate the benchmark productivity for high‐purity C 2 H 4 (>99.995%) of 194.7 mol kg −1 and 5.96 mol kg −1 from binary C 2 H 2 /C 2 H 4 (1/99, v/v ) and ternary C 2 H 2 /CO 2 /C 2 H 4 (1/9/90, v/v/v ) gas mixtures.