A High-Stability Co-MOF with Open Metal Sites for C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub>/CH<sub>4</sub> Separation
Tianyi Hou, He Wang, Yuanyuan Zhang, Zhengyi Di, Cheng‐Peng Li
Abstract
One-step purification of C 2 H 2 from ternary mixtures (C 2 H 2, CO 2, and CH 4 ) 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 C 2 H 2 (37.4 cm 3 g –1 ) and significant adsorption selectivity for C 2 H 2 over CH 4 (20.1) and CO 2 (4.9) at 298 K and 100 kPa. Dynamic breakthrough studies show that it exhibits excellent C 2 H 2 separation from C 2 H 2 /CO 2 /CH 4 three-component mixtures.