Facile Synthesis of Bifunctional Heterogeneous Catalysts Used for the Chemical Fixation of a Low Concentration of CO2
Mounting concerns over climate change driven by anthropogenic greenhouse gas emissions have intensified demands for technologies that enable efficient conversion of CO2 into value-added chemicals. We report a bifunctional heterogeneous catalyst ZnBr2@PIL-VIm-Bpy, engineered through in situ metal coordination and radical polymerization, to co-anchor Lewis acidic ZnBr2-bipyridine complexes and nucleophilic imidazolium species within a porous ionic polymer matrix. Multimodal characterization (including solid-state NMR, XPS, FT-IR, etc.) verified the successful heterogenization of dual active sites in ZnBr2@PIL-VIm-Bpy. The obtained material exhibits excellent catalytic activity in CO2 cycloaddition reactions, and the conversion can reach 98.0% with a selectivity of 99.0% within 48 h at relatively mild conditions, comparable with those of homogeneous ionic liquids of VIm-Bpy and a binary catalytic system of ZnBr2+VIm-Bpy. The catalyst ZnBr2@PIL-VIm-Bpy can be easily separated from the product and can be reused at least 5 times without significant loss of catalytic activity, demonstrating excellent reusability and robustness. Especially, when the catalyst is applied to industrial flue gas conditions with low concentrations of CO2, a conversion of 85.5% can still be achieved in 96 h, which even surpasses the homogeneous catalysts of VIm-Bpy and ZnBr2+VIm-Bpy, confirming its outstanding catalytic performance in the elimination of low concentrations of CO2. This work establishes a heterogenization strategy combining enzymatic-like cooperativity with heterogeneous catalysts’ practicality, demonstrating particular promise for point-source carbon capture–utilization integration.
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