title = {Breaking the trade-off between selectivity and adsorption capacity for gas separation},
journal = {Chem},
year = {2021},
issn = {2451-9294},
doi = {https://doi.org/10.1016/j.chempr.2021.07.007},
url = {https://www.sciencedirect.com/science/article/pii/S2451929421003636},
author = {Naveen Kumar and Soumya Mukherjee and Nathan C. Harvey-Reid and Andrey A. Bezrukov and Kui Tan and Vinicius Martins and Matthias Vandichel and Tony Pham and Lisa M. {van Wyk} and Kolade Oyekan and Amrit Kumar and Katherine A. Forrest and Komal M. Patil and Leonard J. Barbour and Brian Space and Yining Huang and Paul E. Kruger and Michael J. Zaworotko},
keywords = {crystal engineering, porous materials, physisorbent, hybrid ultramicroporous material, gas purification, gas separation, selectivity, acetylene, carbon dioxide},
abstract = {Summary
The trade-off between selectivity and adsorption capacity with porous materials is a major roadblock to reducing the energy footprint of gas separation technologies. To address this matter, we report herein a systematic crystal engineering study of C2H2 removal from CO2 in a family of hybrid ultramicroporous materials (HUMs). The HUMs are composed of the same organic linker ligand, 4-(3,5-dimethyl-1H-pyrazol-4-yl)pyridine, pypz, three inorganic pillar ligands, and two metal cations, thereby affording six isostructural pcu topology HUMs. All six HUMs exhibited strong binding sites for C2H2 and weaker affinity for CO2. The tuning of pore size and chemistry enabled by crystal engineering resulted in benchmark C2H2/CO2 separation performance. Fixed-bed dynamic column breakthrough experiments for an equimolar (v/v = 1:1) C2H2/CO2 binary gas mixture revealed that one sorbent, SIFSIX-21-Ni, was the first C2H2 selective sorbent that combines exceptional separation selectivity (27.7) with high adsorption capacity (4 mmol·g−1).}