Low thermal solid-solid coupling reaction for in situ synthesis of nano-CaO and CO via nano-CaCO3 and carbon powder
At high temperatures,solid-phase CaO can directly react with CO2,achieving a capture rate of 78.57 wt％and serving as an efficient means to address carbon emissions.Key challenges in calcium looping technolo-gy include reducing the decomposition temperature of CaCO3,regenerating CaO,and efficiently utilizing CO2.In this study,a low thermal solid-solid coupling reaction between nano-CaCO3 and carbon powder was employed to simultaneously regenerate nano-CaO and convert CO2 in-situ to CO.This process led to a 46 ℃ reduction in the decomposition temperature of nano-CaCO3,accompanied by an approximately 50％increase in decomposi-tion rate.The regenerated porous nano-CaO exhibited small and uniform particle size,facilitating its reuse for CO2 capture and achieving calcium looping utilization.The CO produced from the conversion of CO2 can be ap-plied in industrial syngas synthesis.Nano-CaCO3 and carbon powder offer advantages such as wide availability,low cost,high safety,and convenient transportation.The low thermal solid-solid coupling reaction holds the potential to enhance CO2 capture and utilization efficiency under the premise of low cost.
nano-CaCO3low thermal solid-solid couplingcalcium looping technologyregeneration of nano-CaOin-situ conversion of CO2 to CO
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