Multifunctional and Ultrastable Co-MOF Effectively Separates Various Different Component Gas Mixtures

Developing low-cost and multifunctional adsorbents for adsorption separation to obtain high-purity (>99.9%) gases is intriguing yet challenging. Notably, the ongoing trade-off between adsorption capacity and selectivity in separating multicomponent mixed gases still persists as a pressing scientific challenge requiring urgent attention. Herein, the ultrastable TJT-100 exhibits unique structural characteristics including uncoordinated carboxylate oxygen atoms, coordinated water molecules directed toward the pore surface, and sufficient Me₂NH₂⁺ cations in channels. TJT-100 exhibits a high adsorption capacity and exceptional separation performance, particularly notable for its high C₂H₂ capacity of 127.7 cm³/g and remarkable C₂H₂ selectivity over CO₂ (5.4) and CH₄ (19.8), which makes it a standout material for various separation applications. In a breakthrough experiment with a C₂H₂/CO₂ mixture (v/v = 50/50), TJT-100 achieved a record-high C₂H₂ productivity of 69.33 L/kg with a purity of 99.9%. Additionally, TJT-100 demonstrates its effectiveness in separating CO₂ from natural gas and flue gas. Its exceptional selectivity for CO₂/CH₄ (10.7) and CO₂/N₂ (11.9) results in a high CO₂ productivity of 21.23 and 22.93 L/kg with 99.9% purity from CO₂/CH₄ (v/v = 50/50) and CO₂/N₂ (v/v = 15/85) mixtures, respectively.