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Mercury removal from coal combustion flue gas by modified fly ash
Xu, Wenqing1; Wang, Hairui1,2; Zhu, Tingyu1; Kuang, Junyan1,2; Jing, Pengfei1
2013-02-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume25Issue:2Pages:393-398
AbstractFly ash is a potential alternative to activated carbon for mercury adsorption. The effects of physicochemical properties on the mercury adsorption performance of three fly ash samples were investigated. X-ray fluorescence spectroscopy, X-ray photoelectron spectroscopy, and other methods were used to characterize the samples. Results indicate that mercury adsorption on fly ash is primarily physisorption and chemisorption. High specific surface areas and small pore diameters are beneficial to efficient mercury removal. Incompletely burned carbon is also an important factor for the improvement of mercury removal efficiency, in particular. The C M bond, which is formed by the reaction of C and Ti, Si and other elements, may improve mercury oxidation. The samples modified with CuBr2, CuCl2 and FeCl3 showed excellent performance for Hg removal, because the chlorine in metal chlorides acts as an oxidant that promotes the conversion of elemental mercury (Hg-0) into its oxidized form (Hg2+). Cu2+ and Fe3+ can also promote Hg-0 oxidation as catalysts. HCl and O-2 promote the adsorption of Hg by modified fly ash, whereas SO2 inhibits the Hg adsorption because of competitive adsorption for active sites. Fly ash samples modified with CuBr2, CuCl2 and FeCl3 are therefore promising materials for controlling mercury emissions.
KeywordFly Ash Mercury Modified Adsorption Flue Gas
SubtypeArticle
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS KeywordELEMENTAL MERCURY ; OXIDATION ; CATALYSTS ; SURFACE ; CARBON ; ADSORPTION
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000316517600021
Citation statistics
Cited Times:97[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13520
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Res Ctr Proc Pollut Control, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Wenqing,Wang, Hairui,Zhu, Tingyu,et al. Mercury removal from coal combustion flue gas by modified fly ash[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2013,25(2):393-398.
APA Xu, Wenqing,Wang, Hairui,Zhu, Tingyu,Kuang, Junyan,&Jing, Pengfei.(2013).Mercury removal from coal combustion flue gas by modified fly ash.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,25(2),393-398.
MLA Xu, Wenqing,et al."Mercury removal from coal combustion flue gas by modified fly ash".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 25.2(2013):393-398.
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