Efficient Xe selective separation from Xe/Kr/N mixtures over a microporous CALF-20 framework.

Capture and separation of xenon and krypton by adsorption are particularly important issues at room temperature in both industry and environmental security. Herein, hydrophobic zinc-based frameworks (CALF-20) were synthesized to separate mixtures of Xe, Kr and N, and adsorptive properties and stability of as-prepared samples were investigated in detail. CALF-20 with the 1,2,4-triazole and oxalate as the ligand and Zn metal centers showed a surface area of 442 m g and average pore size of 6-7 Å, and exhibited excellent stability in a high-temperature acidic solution.