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Mechanism of Hg-0 oxidation in the presence of HCl over a commercial V2O5-WO3/TiO2 SCR catalyst
Liu, Ruihui1,2; Xu, Wenqing1; Tong, Li1; Zhu, Tingyu1
2015-10-01
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
ISSN1001-0742
Volume36Issue:OCTPages:76-83
Abstract

Experiments were conducted in a fixed-bed reactor containing a commercial V2O5/WO3/TiO2 catalyst to investigatemercury oxidation in the presence of HCl and O-2. Mercury oxidation was improved significantly in the presence of HCl and O-2, and the Hg-0 oxidation efficiencies decreased slowly as the temperature increased from 200 to 400 degrees C. Upon pretreatment with HCl and O-2 at 350 degrees C, the catalyst demonstrated higher catalytic activity for Hg-0 oxidation. Notably, the effect of pretreatment with HCl alone was not obvious. For the catalyst treated with HCl and O-2, better performance was observed with lower reaction temperatures. The results showed that both HCl and Hg-0 were first adsorbed onto the catalyst and then reacted with O-2 following its adsorption, which indicates that the oxidation of Hg0 over the commercial catalyst followed the Langmuir-Hinshelwood mechanism. Several characterization techniques, including Hg-0 temperature-programmed desorption (Hg-TPD) and X-ray photoelectron spectroscopy (XPS), were employed in this work. Hg-TPD profiles showed that weakly adsorbed mercury species were converted to strongly bound species in the presence of HCl and O-2. XPS patterns indicated that new chemisorbed oxygen species were formed by the adsorption of HCl, which consequently facilitated the oxidation of mercury. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

KeywordMercury Hydrogen Chloride Vanadium-based Catalyst Oxidation Mechanism
SubtypeArticle
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1016/j.jes.2015.03.031
Indexed BySCI
Language英语
WOS KeywordCOMBUSTION FLUE-GAS ; PHASE ELEMENTAL MERCURY ; IRON-BASED SORBENTS ; ACTIVATED CARBON ; FUEL GAS ; REDUCTION CATALYSTS ; HYDROCHLORIC-ACID ; POWER-PLANTS ; REMOVAL ; TEMPERATURE
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000362983500010
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19666
Collection湿法冶金清洁生产技术国家工程实验室
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.Northeastern Univ, Qinhuangdao Branch, Sch Resources & Mat, Qinhuangdao 066004, Peoples R China
Recommended Citation
GB/T 7714
Liu, Ruihui,Xu, Wenqing,Tong, Li,et al. Mechanism of Hg-0 oxidation in the presence of HCl over a commercial V2O5-WO3/TiO2 SCR catalyst[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,36(OCT):76-83.
APA Liu, Ruihui,Xu, Wenqing,Tong, Li,&Zhu, Tingyu.(2015).Mechanism of Hg-0 oxidation in the presence of HCl over a commercial V2O5-WO3/TiO2 SCR catalyst.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,36(OCT),76-83.
MLA Liu, Ruihui,et al."Mechanism of Hg-0 oxidation in the presence of HCl over a commercial V2O5-WO3/TiO2 SCR catalyst".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 36.OCT(2015):76-83.
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