Abstract
The reduction of CO2 into value-added chemicals is highly desired, especially when there is no catalyst and the water is used as a green solvent under mild reaction conditions. In this work, an effective process for the base-assisted transfer hydrogenation of CO2 to formate with ammonia borane (BH3NH3) in water is demonstrated under mild conditions without any catalysts. Further research shows that CO2 reacts with water and base to produce bicarbonate intermediate which can be easily reduced to formate by BH3NH3. The role of base is to capture CO2 and move the unfavourable equilibrium of CO2 reduction towards the formation of product. This new mechanism can also lead to achieve the reduction of commercial bicarbonate or carbonate to formate under the same conditions.
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