ICCAS OpenIR
DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3
Chen, Liang1,2; Li, Junhua1,3; Ge, Maofa2
2010-12-15
Source PublicationENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN0013-936X
Volume44Issue:24Pages:9590-9596
AbstractCeO2/TiO2 and CeO2-WO3/TiO2 catalysts prepared by impregnation method assisted with ultrasonic energy were investigated on the selective catalytic reduction (SCR) of NO (NO and NO2) by NH3. The catalytic activity of 10% CeO2/TiO2 (CeTi) was greatly enhanced by the addition of 6% WO3 in the broad temperature range of 200-500 degrees C, the promotion mechanism was proposed on basis of the results of in situ diffuse reflectance infrared transform spectroscopy (DRIFT). When NH3 was introduced into both catalysts preadsorbed with NO + O-2, SCR would not proceed except for the reaction between NO2 and ammonia. For CeO2/TiO2 catalysts, coordinated NH3 linked to Lewis acid sites were the main adsorbed ammonia species. When NO + O-2 was introduced, all the ammonia species consumed rapidly, indicating that these species could react with NO effectively. Two different reaction routes, L-H mechanism at low temperature (<200 degrees C) and E-R mechanism at high temperatures (>200 degrees C), were presented for SCR reaction over CeO2/TiO2 catalyst. For CeO2-WO3/TiO2 catalysts, the Lewis acid sites on CO4+ state could be converted to Bronsted acid sites due to the unsaturated coordination of Cen+ and Wn+ ions. When NO + O-2 was introduced, the reaction proceeded more quickly than that on CeO2/TiO2. The reaction route mainly followed E-R mechanism in the temperature range investigated (150-350 degrees C) over CeO2-WO3/TiO2 catalysts. Tungstation was beneficial for the formation of Ce3+, which would influence the active sites of the catalyst and further change the mechanisms of SCR reaction. In this way, the cooperation of tungstation and the presence of Ce3+ state resulted in the better activity of CeO2-WO3/TiO2 compared to that of CeO2/TiO2.
DOI10.1021/es102692b
Indexed BySCI
Language英语
WOS IDWOS:000285266900055
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:340[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70770
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, State Key Lab Struct Chem Unstable & Stable Speci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China
3.Tsinghua Univ, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Chen, Liang,Li, Junhua,Ge, Maofa. DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2010,44(24):9590-9596.
APA Chen, Liang,Li, Junhua,&Ge, Maofa.(2010).DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3.ENVIRONMENTAL SCIENCE & TECHNOLOGY,44(24),9590-9596.
MLA Chen, Liang,et al."DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3".ENVIRONMENTAL SCIENCE & TECHNOLOGY 44.24(2010):9590-9596.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Chen, Liang]'s Articles
[Li, Junhua]'s Articles
[Ge, Maofa]'s Articles
Baidu academic
Similar articles in Baidu academic
[Chen, Liang]'s Articles
[Li, Junhua]'s Articles
[Ge, Maofa]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chen, Liang]'s Articles
[Li, Junhua]'s Articles
[Ge, Maofa]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.