Cation exchange in an anionic metal-organic framework enhancing propylene/propane separation

被引:3
|
作者
Zhang, Xue [1 ]
Tang, Hui-Juan [1 ]
Zeng, Min [1 ]
Yang, Rong [1 ]
Wang, Yu [1 ]
Chen, Kai-Jie [1 ]
机构
[1] Northwestern Polytech Univ, Sch Chem & Chem Engn, Key Lab Special Funct & Smart Polymer Mat, Minist Ind & Informat Technol,Xian Key Lab Funct O, Xian 710072, Shaanxi, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
ADSORPTION; ETHYLENE; ETHANE; MOFS;
D O I
10.1039/d3ce00761h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Highly selective adsorptive separation of propylene/propane (C3H6/C3H8) using metal-organic frameworks (MOFs) is a promising approach to reducing energy consumption in the chemical industry. Here, we report a 3D anionic MOF obtained by the exchange of dimethylamine cations with small K+ ions. 77 K N2 isotherms proved that the pore volume increased from 0.30 cm3 g-1 to 0.42 cm3 g-1 after ion exchange. Moreover, at near room temperatures (273 K and 298 K), both single-component gas adsorption capacity and selectivity of C3H6/C3H8 were enhanced. The C3H6/C3H8 separation potential was further confirmed by breakthrough experiments with equimolar C3H6/C3H8 mixtures. Similar separation properties were also observed in ethylene/ethane separation. Exchanging dimethylamine cations with smaller K+ ions in an anionic MOF can significantly increase the pore volume and provide preferable interactions for C3H6, resulting in improved adsorption capacity and selectivity of C3H6/C3H8.
引用
收藏
页码:6039 / 6043
页数:5
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