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Construction of a Stable Crystalline Polyimide Porous Organic Framework for C<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub> and CO<sub>2</sub>/N<sub>2</sub> Separation
45
Citations
53
References
2019
Year
Utilization of porous materials for gas capture and separation is a hot research topic. Removal of acetylene (C<sub>2</sub> H<sub>2</sub> ) from ethylene (C<sub>2</sub> H<sub>4</sub> ) is important in the oil refining and petrochemical industries, since C<sub>2</sub> H<sub>2</sub> impurities deactivate the catalysts and terminate the polymerization of C<sub>2</sub> H<sub>4</sub> . Carbon dioxide (CO<sub>2</sub> ) emission from power plants contributes to global climate change and threatens the survival of life on this planet. Herein, 2D crystalline polyimide porous organic framework PAF-120, which was constructed by imidization of linear naphthalene-1,4,5,8-tetracarboxylic dianhydride and triangular 1,3,5-tris(4-aminophenyl)benzene, showed significant thermal and chemical stability. Low-pressure gas adsorption isotherms revealed that PAF-120 exhibits good selective adsorption of C<sub>2</sub> H<sub>2</sub> over C<sub>2</sub> H<sub>4</sub> and CO<sub>2</sub> over N<sub>2</sub> . At 298 K and 1 bar, its C<sub>2</sub> H<sub>2</sub> and CO<sub>2</sub> selectivities were predicted to be 4.1 and 68.7, respectively. More importantly, PAF-120 exhibits the highest selectivity for C<sub>2</sub> H<sub>2</sub> /C<sub>2</sub> H<sub>4</sub> separation among porous organic frameworks. Thus PAF-120 could be a suitable candidate for selective separation of C<sub>2</sub> H<sub>2</sub> over C<sub>2</sub> H<sub>4</sub> and CO<sub>2</sub> over N<sub>2</sub> .
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