CO2 capture performance of calcium-based sorbent doped with manganese salts during calcium looping cycle

► We modified CaCO3 with manganese salts including Mn(NO3)2 and MnCO3. ► The CO2 capture capacity during multiple cycles is enhanced by modification. ► Mn-doped sorbents keep better pore structure during calcium looping cycles. ► The improvements of Mn(NO3)2 and MnCO3 on CO2 capture capacity are almost the same.