Metal Node Guided Pore Engineering in Carborane‐Based MOFs for Efficient C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 Separations

ABSTRACT The efficient separation of C 2 H 2 from C 2 H 2 /CO 2 and C 2 H 2 /C 2 H 4 mixtures is essential for the preparation of high‐purity C 2 H 2 and C 2 H 4 , but challenged by the trade‐off between the capacity and selectivity. In this work, we report a node guided pore engineering strategy in carborane‐based metal‐organic frameworks (MOFs), leading to the partitioned dual cage system in Co‐CB‐HPBTA in contrast to its analogue Zn‐CB‐HPBTA with one‐dimensional channels. This structural evolution endows Co‐CB‐HPBTA with a high C 2 H 2 adsorption capacity of 103.2 cm 3 /g (4.61 mmol/g) at 298 K and 1 bar, along with superior selectivity for C 2 H 2 /CO 2 (10.6) and C 2 H 2 /C 2 H 4 (13.3). Breakthrough…

• NN
  National Natural Science Foundation of China

  Awards: 22205207, 22378369, W2431013