Abstract
Integration of Lewis acid and base sites and oxygen surface groups in one catalyst is favorable to promote CO2 cycloaddition reaction. Here, Zn-ZIF-L was used as starting material to design one kind of catalyst with multiple active sites via pyrolysis and oxidization treatment. The well-dispersed ZnO nanoparticles and pyridinic nitrogen in nitrogen-doped carbon serve as Lewis acid and base sites to activate epoxide and CO2 while oxygen surface groups help promote the ring-opening reaction of epoxides. Results show that Zn-ZIF-L derived catalyst displays high catalytic activities for CO2 cycloaddition (6 h, 83% of yield) under mild conditions (70 °C and 0.1 MPa CO2) and outperforms ZIF-8 derived catalyst. Moreover, the obtained catalyst also achieves a satisfactory photothermal catalysis of cycloaddition reaction under light irradiation (120 mW/cm2), which makes our sample a promising catalyst for CO2 conversion.
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