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Tuning Gate-Opening of a Flexible Metal-Organic Framework for Ternary Gas Sieving Separation. 2020

Qiubing Dong, and Xin Zhang, and Shuang Liu, and Rui-Biao Lin, and Yanan Guo, and Yunsheng Ma, and Akira Yonezu, and Rajamani Krishna, and Gongpin Liu, and Jingui Duan, and Ryotaro Matsuda, and Wanqin Jin, and Banglin Chen
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.

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 (C2 H4 ), acetylene (C2 H2 ), and carbon dioxide (CO2 ) 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 C2 H2 and CO2 through gate-opening and only negligible amount of C2 H4 . Breakthrough experiments demonstrated that this material can simultaneously capture C2 H2 and CO2 , yielding polymer-grade (>99.99 %) C2 H4 from single breakthrough separation.

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