Abstract
The archetypical metal-organic framework (MOF), HKUST-1, has been systematically modified in both its organic and inorganic building blocks to introduce diversity in the metal centers and create defects within the network, achieving a variety of bimetallic hierarchical structures. These modifications changed the affinity of the MOFs for acid gases. The introduction of bimetallic sites mostly affects CO2 adsorption, while the hierarchical structure generates an increase in SO2 uptake capacity, allowing better performance in the separation of binary mixtures of these gases near room temperature. Notably, the synthesized HH-Cu100 material exhibited an exceptionally high IAST SO2/CO2 (10:90) selectivity of 3420 at 298 K, outperforming benchmark MOFs with open metal sites.
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