Chemistry

Materials science

Programming language

Engineering

Composite material

Biochemistry

Nanotechnology

Organic chemistry

Membrane

Ternary operation

Catalysis

Computer science

Carbon dioxide

Adsorption

Ethylene

Metal-organic framework

Gas separation

Acetylene

Chemical engineering

Polymer

Angewandte Chemie International Edition

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.

Tuning Gate‐Opening of a Flexible Metal–Organic Framework for Ternary Gas Sieving Separation