Abstract
• For the first time, specific binding sites for C 2 H 2 are constructed utilizing the MOFs interpenetration nets. • The synergy of hydrogen bond anchoring and strong Tb···C≡C electrostatic interaction enhances the C 2 H 2 capture. • High C 2 H 2 capacity and excellent selectivity over CO 2 and C 2 H 4 . • Detailed theoretical calculations explore the mechanism of host-guest combination. Efficient separation of C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 is necessary and challenging for industrial processes. The traditional method of pore sieving has great limitations for separating gases with similar characteristics. Herein, we report a new case ( UPC-80 ) with the help of C 2 H 2 anchoring traps constructed by 4-fold interpenetration nets for gas separation. The single-component adsorption isotherms indicate that UPC-80 adsorbs more C 2 H 2 than C 2 H 4 and CO 2 , resulting in high adsorption selectivities of 6.34 and 4.78 for C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 at 298 K, respectively. Laboratory-scale fixed-bed breakthrough experiments verify the efficient separation ability of UPC-80 toward the C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 gas mixtures, remaining separation stability with negligible capacity loss. Theoretical simulations confirm that the good separation performance can be attributed to the anchoring of C 2 H 2 by two Tb 2 (COO) 6 clusters in adjacent interpenetration nets, as well as the strong electrostatic interaction. UPC-80 makes the first exploration to obtain specific C 2 H 2 binding sites by interpenetrated networks, becoming an excellent candidate as porous adsorbent for separating C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 .
Published Version
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