Engineering Porphyrin Metal-Organic Framework Composites as Multifunctional Platforms for CO₂ Adsorption and...

As an effective solution toward the establishment of a sustainable society, the reductive transformation of CO₂ into value-added products is certainly important and imperative. Herein, we report a porphyrin metal-organic framework composite Au@Ir-PCN-222, which is obtained through the in situ formation of Au nanoparticles in the coordination interspaces of Ir-PCN-222. Catalytic results show that Au@Ir-PCN-222 is highly efficient for CO₂ reduction and aminolysis, giving rise to formamides in high yields and selectivities under room temperature and atmospheric pressure. Mechanistic studies disclose that the high efficiency of Au@Ir-PCN-222 is due to the synergistic catalysis of Au NPs and Ir-PCN-222, in which Au NPs can adsorb CO₂ molecules on their surfaces and then increase the CO₂ concentration in the cavities of the framework, and at the same time, Au NPs transfer electrons to Ir-porphyrin units and therefore increase the interactions with CO₂ molecules.