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, Xinglong Dong, Y. Han, B. Li, Q. Ren, M. J. Zaworotko, B. Chen

Research output: Contribution to journalArticlepeer-review

593 Scopus citations

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 metal coordination networks with hexafluorosilicate and organic linkers for the purpose of 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 millimoles per gram 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 millimoles per gram from a 1/99 mixture).
Original languageEnglish (US)
Pages (from-to)141-144
Number of pages4
JournalScience
Volume353
Issue number6295
DOIs
StatePublished - May 19 2016

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