Cu-based metal-organic framework with dual open metal sites for efficient separation of CO2 from flue gas.

Excessive carbon dioxide (CO 2) emissions from flue gases intensify the greenhouse effect. Exploring porous adsorbents with high CO 2 /N 2 selectivity is of great significance to reducing the CO 2 content in flue gases. Herein, we report a novel PtS-type metal-organic framework (MOFs), termed ZSTU-21, with narrow pore size and excellent CO 2 /N 2 separation performance with dual open copper sites. At 298 K, ZSTU-21 exhibits a CO 2 uptake capacity of 62 cm3 g−1 and a high selectivity of 105 for CO 2 /N 2 (CO 2 /N 2 = 15/85, v/v). Multicomponent adsorption breakthrough experiments further verified the superior performance of ZSTU-21 MOF in CO 2 /N 2 separation. Moreover, the synthesis of ZSTU-21 MOF can be carried out under mild experimental conditions at room temperature, making the process simple and cost-effective, thus laying a solid foundation for its widespread application in CO 2 /N 2 separation. A novel PtS-type metal-organic framework (MOFs), termed ZSTU-21, with narrow pore size and excellent CO 2 /N 2 separation performance with dual open copper sites was reported. [Display omitted] • Cu-MOF (ZSTU-21) with two different pore sizes was successfully synthesized at room temperature. • CO 2 /N 2 selectivity was achieved by introducing open metal ions. • ZSTU-21 exhibits high adsorption performance for CO 2 and good separation performance for CO 2 /N 2 capture. [ABSTRACT FROM AUTHOR]