Preparation and SO2 capture performance of NCP10/LiOH carbon-based composite for deep desulfurization

Carbon materials mainly capture sulfur dioxide (SO 2 ) from gas through physical adsorption, therefore their SO 2 capture performance will decrease with the increase in desulfurization temperature. In order to meet the stringent requirements of deep desulfurization, further improvements on carbon materials are necessary, improving their SO 2 capture performance and adaptability to changes in desulfurization temperature. In this study, a carbon material (NCP10) was modified with various alkali metal compounds with the aim of enhancing the SO 2 capture performance and adaptability to temperature changes. The results showed that the NCP10/LiOH composite had the best average SO 2 removal rate (100%) and SO 2 capture capacity ( \({113}.{6} \;{\text{mg}}_{{{\text{SO}}_{2} }} /{\text{g}}_{{{\text{material}}}}\) ) within the first hour of reacting at 60 °C, the SO 2 removal rate and SO 2 capture capacity of the NCP10/LiOH composite were 29% and 29% higher than those of the pure NCP10 material, respectively. While the SO 2 capture performance of the NCP10 modified with LiCl, Li 2 CO 3 , NaOH and KOH were not sufficient for deep desulfurization, the SO 2 capture performance of the NCP10/LiOH(2:1) composite was able to meet the requirements of deep desulfurization in the temperature range of 25–100 °C by the physical adsorption and chemical absorption synergistically effect.