One‐Step Ethylene Purification from Ternary Mixture through Adaptive Recognition Sites
Danhua Song, Shuixiang Zou, Zhenyu Ji, Yashuang Li, Hengbo Li, Yunzhe Zhou, Cheng Chen, Qihui Chen, Mingyan Wu, Mingyan Wu
Abstract
Abstract One‐step adsorptive purification of ethylene (C 2 H 4 ) from ternary mixture comprising of acetylene (C 2 H 2 ), ethylene (C 2 H 4 ) and carbon dioxide (CO 2 ) is a great challenge in the chemical industry. Herein, a microporous metal–organic framework ( FJI‐H38) has been reported, which possesses high‐density electronegative O/N binding sites and appropriate pore size. Notably, at 0.01 bar and 298 K FJI‐H38 shows excellent trapping capability for C 2 H 2 (1.64 mmol/g) and CO 2 (2.33 mmol/g), while the uptake of C 2 H 4 is only 0.41 mmol/g, which endows FJI‐H38 high C 2 H 2 /C 2 H 4 and top‐level CO 2 /C 2 H 4 selectivity simultaneously. Polymer‐grade C 2 H 4 (≥99.95 %) with record‐high productivity can be successfully obtained from ternary C 2 H 2 /CO 2 /C 2 H 4 mixture in one step under various conditions. Even at 318 K, the separation performance has no obvious decrease. Such excellent separation performance is due to the adaptive recognition of C 2 H 2 and CO 2 by FJI‐H38 through the synergistic effect of appropriate pore size and the match of electrostatic potentials, where C 2 H 2 and CO 2 can be stabilized by the O/N and aromatic ring sites.