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A High-Stability Co-MOF with Open Metal Sites for C2H2/CO2/CH4 Separation
Tianyi Hou1, He Wang1, Yuan-Yuan Zhang1
1Academy of Interdisciplinary Studies on Intelligent Molecules, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China.
Abstract:
One-step purification of C2H2 from ternary mixtures (C2H2, CO2, and CH4) can significantly reduce the energy consumption of the separation process, but it is extremely challenging. A new Co-MOF (TNU-BTTB-1) with a three-dimensional (3D) framework was synthesized, which displays high thermal stability, retaining its structural integrity at temperatures up to 400 °C. The structure possesses rich accessible open metal sites in the porous walls and shows high uptake for C2H2 (37.4 cm3 g-1) and significant adsorption selectivity for C2H2 over CH4 (20.1) and CO2 (4.9) at 298 K and 100 kPa. Dynamic breakthrough studies show that it exhibits excellent C2H2 separation from C2H2/CO2/CH4 three-component mixtures.
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