A Highly Efficient Heterogenized Iridium Complex for the Catalytic Hydrogenation of Carbon Dioxide to Formate

A heterogenized catalyst on a highly porous covalent triazine framework was synthesized and characterized to have a coordination environment similar to that of its homogeneous counterpart. The catalyst efficiently converted CO2 into formate through hydrogenation with a turnover number of 5000 after 2 h and an initial turnover frequency of up to 5300 h−1; both of these values are the highest reported to date for a heterogeneous catalyst, which makes it attractive toward industrial application. Furthermore, the synthesized catalyst was found to be stable in air and was recycled by simple filtration without significant loss of catalytic activity. Complex in New Basket: A new, highly porous, industrially viable, heterogenized Ir catalyst has been synthesized and characterized, and the coordination environment is confirmed to be similar to that of its homogeneous counterpart. The catalyst efficiently converts CO2 to formate through hydrogenation at high turnover frequencies (TOFs) and turnover numbers (TONs) and shows good stability during the recycling process.