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

• Published in: Research on chemical intermediates Vol. 49; no. 8; pp. 3605 - 3626
• Main Authors: Li, Xing, Huhe, Taoli, Zeng, Tao, Ling, Xiang, Huang, Hongyu, Chen, Yong
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.08.2023; Springer Nature B.V
• Subjects: Adsorption; Alkali metal compounds; Carbon; Catalysis; Chemistry; Chemistry and Materials Science; Desulfurizing; Inorganic Chemistry; Lithium carbonate; Metal compounds; Physical Chemistry; Sulfur dioxide; Sulfur dioxide recovery; Carbon-based composites; Alkali metal modified compounds; Sulfur dioxide capture; Desulfurization temperature; Deep desulfurization
• ISSN: 0922-6168; 1568-5675
• DOI: 10.1007/s11164-023-05036-0

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 mg SO 2 / g 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.