title: Regeneration performance and carbon consumption of semi-coke and activated coke for SO₂ and NO removal.
abstract: To decrease the operating cost of flue gas purification technologies based on carbon-based materials, the adsorption and regeneration performance of low-price semi-coke and activated coke were compared for SO2 and NO removal in a simulated flue gas. The functional groups of the two adsorbents before and after regeneration were characterized by a Fourier transform infrared (FTIR) spectrometer, and were quantitatively assessed using temperature programmed desorption (TPD) coupled with FTIR and acid-base titration. The results show that semi-coke had higher adsorption capacity (16.2% for SO2 and 38.6% for NO) than activated coke because of its higher content of basic functional groups and lactones. After regeneration, the adsorption performance of semi-coke decreased because the number of active functional groups decreased and the micropores increased. Semi-coke had better regeneration performance than activated coke. Semi-coke had a larger SO2 recovery of 7.2% and smaller carbon consumption of 12% compared to activated coke. The semi-coke carbon-based adsorbent could be regenerated at lower temperatures to depress the carbon consumption, because the SO2 recovery was only reduced a small amount.
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China; National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: sding@ipe.ac.cn.
authors.forename: Song
authors.initials: S
authors.lastname: Ding
authors.affiliation: National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yuran
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China; National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: tyzhu@ipe.ac.cn.
authors.forename: Tingyu
authors.initials: T
authors.lastname: Zhu
authors.affiliation: National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yangyang
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D003077:Coke / Q000032:analysis*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D009569:Nitric Oxide / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D003077:Coke; D013458:Sulfur Dioxide; D009569:Nitric Oxide; D002244:Carbon
keywords: Adsorption; Carbon consumption; Functional groups; SO(2) recovery