Pore Space Partition Enabled by Lithium(I) Chelation of a Metal–Organic Framework for Benchmark C 2 H 2 /CO 2 Separation

Adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) offers a promising approach to purify C2H2 with low-energy footprints. However, the development of ideal adsorbents with simultaneous high C2H2 adsorption and selectivity remains a great challenge due to their very small molecular sizes and physical properties. Herein, we report a lithium(I)-chelation strategy for pore space partition (PSP) in a microporous MOF (Li+@NOTT-101-(COOH)2) to achieve simultaneous high C2H2 uptake and selectivity. The chelation model of Li+ ions within the framework was visually identified by single-crystal X-ray diffraction studies. The immobilized Li+ ions were found to have two functions: (1) partitioning large…

• NN
  National Natural Science Foundation of China

  Awards: U22A20251, 22275064, 92163110, W2431013, 52073251
• SA
  Science and Technology Department of Zhejiang Province

  Award: 2022C01225
• NS
  Natural Science Foundation of Zhejiang Province

  Award: LR22E030003