Pore chemistry and size control in hybrid porous materials for acetylene capture from ethylene

X. Cui, K. Chen, H. Xing, Q. Yang, R. Krishna, Z. Bao, H. Wu, W. Zhou, X. Dong, Y. Han, B. Li, Q. Ren, M.J. Zaworotko, B. Chen
Science, (2016)

Pore chemistry and size control in hybrid porous materials for acetylene capture from ethylene

Keywords

Pore chemistry, Size control, Porous materials, Acetylene capture

Abstract

​The trade-off between physical adsorption capacity and selectivity of porous materials is a major barrier for efficient gas separation and purification through physisorption. We report control over pore chemistry and size in copper coordination networks with SiF62- and organic linkers for the preferential binding and orderly assembly of acetylene molecules through cooperative host-guest and/or guest-guest interactions. The specific binding sites for acetylene are validated by modeling and neutron powder diffraction studies. The energies associated with these binding interactions afford high adsorption capacity (2.1 mmol/g at 0.025 bar) and selectivity (39.7 to 44.8) for acetylene at ambient conditions. Their efficiency for the separation of acetylene/ethylene mixtures is demonstrated by experimental breakthrough curves (0.73 mmol/g from 1/99 mixture).

Code

DOI: 10.1126/science.aaf2458

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