Multifunctional\nand Ultrastable Co-MOF Effectively\nSeparates Various Different Component Gas Mixtures

Developing low-cost and multifunctional adsorbents for\nadsorption\nseparation to obtain high-purity (>99.9%) gases is intriguing yet\nchallenging. Notably, the ongoing trade-off between adsorption capacity\nand selectivity in separating multicomponent mixed gases still persists\nas a pressing scientific challenge requiring urgent attention. Herein,\nthe ultrastable <b>TJT-100</b> exhibits unique structural characteristics\nincluding uncoordinated carboxylate oxygen atoms, coordinated water\nmolecules directed toward the pore surface, and sufficient Me<sub>2</sub>NH<sub>2</sub><sup>+</sup> cations in channels. <b>TJT-100</b> exhibits a high adsorption capacity and exceptional separation performance,\nparticularly notable for its high C<sub>2</sub>H<sub>2</sub> capacity\nof 127.7 cm<sup>3</sup>/g and remarkable C<sub>2</sub>H<sub>2</sub> selectivity over CO<sub>2</sub> (5.4) and CH<sub>4</sub> (19.8),\nwhich makes it a standout material for various separation applications.\nIn a breakthrough experiment with a C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> mixture (v/v = 50/50), <b>TJT-100</b> achieved a record-high\nC<sub>2</sub>H<sub>2</sub> productivity of 69.33 L/kg with a purity\nof 99.9%. Additionally, <b>TJT-100</b> demonstrates its effectiveness\nin separating CO<sub>2</sub> from natural gas and flue gas. Its exceptional\nselectivity for CO<sub>2</sub>/CH<sub>4</sub> (10.7) and CO<sub>2</sub>/N<sub>2</sub> (11.9) results in a high CO<sub>2</sub> productivity\nof 21.23 and 22.93 L/kg with 99.9% purity from CO<sub>2</sub>/CH<sub>4</sub> (v/v = 50/50) and CO<sub>2</sub>/N<sub>2</sub> (v/v = 15/85)\nmixtures, respectively.