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 Me 2 NH 2 + cations in channels. TJT-100 exhibits a high adsorption capacity and exceptional separation performance, particularly notable for its high C 2 H 2 capacity of 127.7 cm 3 /g and remarkable C 2 H 2 selectivity over CO 2 (5.4) and CH 4 (19.8), which makes it a standout material for various separation applications. In a breakthrough experiment with a C 2 H 2 /CO 2 mixture (v/v = 50/50), TJT-100 achieved a record-high C 2 H 2 productivity of 69.33 L/kg with a purity of 99.9%. Additionally, TJT-100 demonstrates its effectiveness in separating CO 2 from natural gas and flue gas. Its exceptional selectivity for CO 2 /CH 4 (10.7) and CO 2 /N 2 (11.9) results in a high CO 2 productivity of 21.23 and 22.93 L/kg with 99.9% purity from CO 2 /CH 4 (v/v = 50/50) and CO 2 /N 2 (v/v = 15/85) mixtures, respectively.