Electro ‐field alignment in a novel metal–organic framework for benchmark separation of ethylene from a ternary gas mixture

AbstractOne-step separation of C2H4 from ternary gas mixtures containing acetylene (C2H2), ethylene (C2H4), and carbon dioxide (CO2) 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 C2H4 separation from C2H2/CO2/C2H4 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 C2H2 and CO2 over C2H4. As a result, SIFSIX-TEPE-Cu exhibits high adsorption capacities for C2H2 (123  cm3 g−1) and CO2 (65  cm3 g−1) at 1.0  bar and 298 K. Notably, the record-high C2H2 uptake (78  cm3 g−1) at 0.01  bar and remarkable C2H2/C2H4 selectivity (615.2) renders benchmark trace C2H2 removal ability. Dynamic breakthrough experiments demonstrate the benchmark productivity for high-purity C2H4 (>99.995%) of 194.7  mol kg−1 and 5.96  mol kg−1 from binary C2H2/C2H4 (1/99,v/v) and ternary C2H2/CO2/C2H4 (1/9/90,v/v/v) gas mixtures.

Source: AIChE Journal - February 23, 2024 Category: Science Authors: Lingmin Wang, Yan Zhang, Peixin Zhang, Xing Liu, Hanting Xiong, Rajamani Krishna, Junhui Liu, Hua Shuai, Pengxiang Wang, Zhenyu Zhou, Jingwen Chen, Shixia Chen, Shuguang Deng, Jun Wang Tags: RESEARCH ARTICLE Source Type: research