Abstract
The one-step purification of ethylene (C2H4) from ternary gas mixtures containing acetylene (C2H2), carbon dioxide (CO2), and C2H4 represents an efficient approach. It remains a significant challenge to simultaneously enhance the adsorption capacities of C2H2 and CO2. Herein, we reported a novel adsorbent, BFFOUR-TEPE-Cu, with compatible alignment of pore electro-fields. The one-connected BF4- anions provide more electronegative F atoms to reinforce the alignment of compatible electro-fields, thereby promoting the preferential adsorption of C2H2 and CO2 over C2H4. As a result, BFFOUR-TEPE-Cu exhibits a leading C2H2 capacity of 63.0 cm3 g−1 and C2H2/C2H4 (1/99, v/v) selectivity of 31.1 at 0.1 bar and 298 K. Computational studies reveal the favorable capture of both C2H2 and CO2 due to the compatible electron-fields. Dynamic breakthrough experiments demonstrate the exceptional capability for one-step production of high-purity C2H4 (>99.99 %) from ternary C2H2/CO2/C2H4 (1/9/90) gas mixture with a C2H4 productivity of 3.4 mol kg−1.
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