期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 1, 页码 1667-1672出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b05431
关键词
Porous material; Acetylene; Gas separation; Functional sites; Gas selectivity; Molecular sieving
资金
- National Natural Science Foundation of China [51472217, 51432001]
- Zhejiang Provincial Natural Science Foundation of China [LR13E020001, LZ15E020001]
- Fundamental Research Funds for the Central Universities [2015QNA4009, 2016FZA4007, 2018QNA4010]
- Welch Foundation [AX-1730]
Separation of acetylene (C2H2) from carbon dioxide (CO2) 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-3(HCOO)(6)center dot DMF] (1DMF), offering high chemical stability, low cost, and high selectivity toward C2H2 over CO2. The exceptional separation performance of the activated 1 is mainly attributed to the small pore size (4.3 angstrom) and functional O donor sites on the pore walls that provide strong binding affinity toward C2H2, as revealed by the detailed computational studies. This material thus exhibits ultrahigh low-pressure C2H2 uptake (38.2 cm(3) cm(-3) at 0.01 bar and 298 K) and possesses a high C2H2/CO2 selectivity (22.0 at ambient conditions), comparable to other leading porous materials. The high separation performance of 1 was further confirmed by the actual breakthrough experiments on a 50/50 C2H2/CO2 mixture.
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