title: Adsorption and desorption of SO2, NO and chlorobenzene on activated carbon.
abstract: Activated carbon (AC) is very effective for multi-pollutant removal; however, the complicated components in flue gas can influence each other's adsorption. A series of adsorption experiments for multicomponents, including SO2, NO, chlorobenzene and H2O, on AC were performed in a fixed-bed reactor. For single-component adsorption, the adsorption amount for chlorobenzene was larger than for SO2 and NO on the AC. In the multi-component atmosphere, the adsorption amount decreased by 27.6% for chlorobenzene and decreased by 95.6% for NO, whereas it increased by a factor of two for SO2, demonstrating that a complex atmosphere is unfavorable for chlorobenzene adsorption and inhibits NO adsorption. In contrast, it is very beneficial for SO2 adsorption. The temperature-programmed desorption (TPD) results indicated that the binding strength between the gas adsorbates and the AC follows the order of SO2>chlorobenzene > NO. The adsorption amount is independent of the binding strength. The presence of H2O enhanced the component effects, while it weakened the binding force between the gas adsorbates and the AC. AC oxygen functional groups were analyzed using TPD and X-ray photoelectron spectroscopy (XPS) measurements. The results reveal the reason why the chlorobenzene adsorption is less affected by the presence of other components. Lactone groups partly transform into carbonyl and quinone groups after chlorobenzene desorption. The chlorobenzene adsorption increases the number of C=O groups, which explains the positive effect of chlorobenzene on SO2 adsorption and the strong NO adsorption.
authors.affiliation: Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: yrli@ipe.ac.cn.
authors.forename: Yuran
authors.initials: Y
authors.lastname: Li
authors.affiliation: Beijing Engineering Research Center of Process Pollution Control, 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
authors.affiliation: Beijing Engineering Research Center of Process Pollution Control, 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: Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Song
authors.initials: S
authors.lastname: Ding
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry; D002606:Charcoal / Q000737:chemistry*; D002722:Chlorobenzenes / Q000737:chemistry*; D008956:Models, Chemical; D009589:Nitrogen Oxides / Q000032:analysis*; D013458:Sulfur Dioxide / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D002722:Chlorobenzenes; D009589:Nitrogen Oxides; D013458:Sulfur Dioxide; D002606:Charcoal; C031294:chlorobenzene
keywords: Activated carbon; Binding force; Flue gas; Functional groups; Multi-components