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Low-Cost and High-Performance Microporous Metal–Organic Framework for Separation of Acetylene from Carbon Dioxide

By Ling Zhang (18071), Ke Jiang (193253), Jun Zhang (48506), Jiyan Pei (6087404), Kai Shao (6087407), Yuanjing Cui (1468846), Yu Yang (83671), Bin Li (39349), Banglin Chen (1525054) and Guodong Qian (1468855)


Separation of acetylene (C<sub>2</sub>H<sub>2</sub>) from carbon dioxide (CO<sub>2</sub>) is very difficult and challenging because of their similar molecular sizes and associated physical properties. Realization of low-cost and high-performance porous materials is of importance to facilitate the implementation of energy-efficient adsorptive separation into practical gas separation applications. Here, we utilized a cheap and commercially available formic acid ligand to successfully construct a robust MOF material [Ni<sub>3</sub>(HCOO)<sub>6</sub>·DMF] (<b>1</b>·DMF), offering high chemical stability, low cost, and high selectivity toward C<sub>2</sub>H<sub>2</sub> over CO<sub>2</sub>. The exceptional separation performance of the activated <b>1</b> is mainly attributed to the small pore size (4.3 Å) and functional O donor sites on the pore walls that provide strong binding affinity toward C<sub>2</sub>H<sub>2</sub>, as revealed by the detailed computational studies. This material thus exhibits ultrahigh low-pressure C<sub>2</sub>H<sub>2</sub> uptake (38.2 cm<sup>3</sup> cm<sup>–3</sup> at 0.01 bar and 298 K) and possesses a high C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> selectivity (22.0 at ambient conditions), comparable to other leading porous materials. The high separation performance of <b>1</b> was further confirmed by the actual breakthrough experiments on a 50/50 C<sub>2</sub>H<sub>2</sub>/CO<sub>2</sub> mixture

Topics: Biochemistry, Medicine, Evolutionary Biology, Ecology, Sociology, Space Science, Environmental Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Carbon Dioxide Separation, gas separation applications, material, HCOO, DMF, pore, selectivity, separation performance, C 2 H 2, CO 2, MOF, cm, O donor sites, formic acid ligand
Year: 2018
DOI identifier: 10.1021/acssuschemeng.8b05431.s001
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Provided by: FigShare
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