ICCAS OpenIR
The poisoning effect of alkali metals doping over nano V2O5-WO3/TiO2 catalysts on selective catalytic reduction of NOx by NH3
Chen, Liang1,2; Li, Junhua1,3; Ge, Maofa2
2011-06-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume170Issue:2-3Pages:531-537
AbstractThe nano TiO2 supported V2O5-WO3/TiO2 catalysts (VWTi) were prepared by impregnation method assisted with ultrasonic energy. Their poisoning on activity by alkali metals (Na, K, Ca and Mg) was investigated. The degree of the poisoning effect for all the alkali metal doped catalysts was shown as follows: K > Na > Ca > Mg. Further investigations were carried by NH3-TPD, DRIFTS, XPS and H-2-TPR characterization. Na and K could decrease the amount and stability of the Bronsted acid sites to a greater extent than Mg and Ca. Surface chemisorbed oxygen could also be reduced and the downward trend was in good agreement with SCR activity. In addition, the reducibility of vanadium species on the Ca and Mg doped catalysts are higher than that on the Na and K doped catalysts with the same alkali metal oxides loadings. Furthermore, Na and K ions could also affect the reduction degree of tungsten species, while no obvious changes have happened for the tungsten species over Ca- and Mg-VWTi catalysts. Consequently, the different poisoning effects of these four alkali metals doped nano V2O5-WO3/TiO2 catalysts are correlated not only to the surface acidity but also to the reducibility of vanadium and tungsten species. (C) 2010 Elsevier B.V. All rights reserved.
KeywordNano V2o5-wo3/tio2 Catalysts Deactivation Alkali Metals Bronsted Acid Sites Reducibility Chemisorbed Oxygen
DOI10.1016/j.cej.2010.11.020
Indexed BySCI
Language英语
WOS IDWOS:000292947200024
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:175[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72062
Collection中国科学院化学研究所
Corresponding AuthorLi, Junhua
Affiliation1.Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China
2.Chinese Acad Sci, Inst Chem, BNLMS, Beijing 100190, Peoples R China
3.State Key Joint Lab Environm Simulat & Pollut Con, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Chen, Liang,Li, Junhua,Ge, Maofa. The poisoning effect of alkali metals doping over nano V2O5-WO3/TiO2 catalysts on selective catalytic reduction of NOx by NH3[J]. CHEMICAL ENGINEERING JOURNAL,2011,170(2-3):531-537.
APA Chen, Liang,Li, Junhua,&Ge, Maofa.(2011).The poisoning effect of alkali metals doping over nano V2O5-WO3/TiO2 catalysts on selective catalytic reduction of NOx by NH3.CHEMICAL ENGINEERING JOURNAL,170(2-3),531-537.
MLA Chen, Liang,et al."The poisoning effect of alkali metals doping over nano V2O5-WO3/TiO2 catalysts on selective catalytic reduction of NOx by NH3".CHEMICAL ENGINEERING JOURNAL 170.2-3(2011):531-537.
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