Abstract Efficient capture and recovery of sulfur hexafluoride (SF 6 ) from SF 6 /N 2 mixtures is critical for mitigating greenhouse effects and promoting gas recycling in the electronics industry. Herein, we report a novel ultra‐microporous three‐dimensional covalent organic framework (COF), termed CPOF‐12, enriched with tert ‐butyl groups. CPOF‐12 exhibits a Brunauer−Emmett−Teller (BET) surface area of 1,140 m 2 g −1 , a pore volume of 0.66 cm 3 g −1 , and a uniform pore size of 0.59 nm, which closely matches the kinetic diameter of SF 6 (0.52 nm). Gas adsorption measurements reveal a high SF 6 uptake of 2.20 mmol g −1 at 298 K and 1 bar, along with an exceptional SF 6 /N 2 selectivity of 149.4, calculated using ideal adsorbed solution theory (IAST). This study highlights the effectiveness of pore surface engineering in COFs for high‐performance separation of greenhouse gases.
Zhao et al. (2025) studied this question.