Dong Qiubing, Zhang Xin, Liu Shuang, Lin Rui-Biao, Guo Yanan, Ma Yunsheng, Yonezu Akira, Krishna Rajamani, Liu Gongpin, Duan Jingui, Matsuda Ryotaro, Jin Wanqin, Chen Banglin
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249-0698, USA.
Angew Chem Int Ed Engl. 2020 Dec 7;59(50):22756-22762. doi: 10.1002/anie.202011802. Epub 2020 Oct 7.
In comparison with the fast development of binary mixture separations, ternary mixture separations are significantly more difficult and have rarely been realized by a single material. Herein, a new strategy of tuning the gate-opening pressure of flexible MOFs is developed to tackle such a challenge. As demonstrated by a flexible framework NTU-65, the gate-opening pressure of ethylene (C H ), acetylene (C H ), and carbon dioxide (CO ) can be regulated by temperature. Therefore, efficient sieving separation of this ternary mixture was realized. Under optimized temperature, NTU-65 adsorbed a large amount of C H and CO through gate-opening and only negligible amount of C H . Breakthrough experiments demonstrated that this material can simultaneously capture C H and CO , yielding polymer-grade (>99.99 %) C H from single breakthrough separation.
与二元混合物分离的快速发展相比，三元混合物的分离要困难得多，并且很少通过单一材料实现。在此，开发了一种调节柔性金属有机框架（MOF）开孔压力的新策略来应对这一挑战。如柔性框架NTU-65所示，乙烯（C₂H₄）、乙炔（C₂H₂）和二氧化碳（CO₂）的开孔压力可通过温度调节。因此，实现了该三元混合物的高效筛分分离。在优化温度下，NTU-65通过开孔吸附了大量的C₂H₄和CO₂，而C₂H₂的吸附量可忽略不计。突破实验表明，这种材料可以同时捕获C₂H₄和CO₂，单次突破分离即可得到聚合物级（>99.99%）的C₂H₄。
