DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3

doi:10.1021/es102692b

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	DRIFT Study on Cerium-Tungsten/Titiania Catalyst for Selective Catalytic Reduction of NOx with NH3
	Chen, Liang 1,2; Li, Junhua 1,3; Ge, Maofa 2
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2010-12-15
卷号	44 期号:24 页码:9590-9596
ISSN号	0013-936X
DOI	10.1021/es102692b
英文摘要	CeO2/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.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000285266900055
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/70769]
专题	中国科学院化学研究所
通讯作者	Li, Junhua
作者单位	1.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
推荐引用方式 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.