The effects of H2O on a vanadium-based catalyst for NH3-SCR at low temperatures: a quantitative study of the reaction pathway and active sites

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 大气污染控制中心

	The effects of H2O on a vanadium-based catalyst for NH3-SCR at low temperatures: a quantitative study of the reaction pathway and active sites
	Liu, Kuo ; Yan, Zidi ; He, Hong ; Feng, Qingcai ; Shan, Wenpo
刊名	CATALYSIS SCIENCE & TECHNOLOGY
	2019-10-21
卷号	9 期号:20 页码:5593-5604
ISSN号	2044-4753
英文摘要	The influences of H2O on the adsorption amounts of NO, NO2, and NH3 on V2O5/WO3-TiO2 and the reaction pathway at low temperatures for selective catalytic reduction of nitrogen oxides by NH3 (NH3-SCR) were quantitatively obtained using the temperature programmed surface reaction as well as the transient response method (TRM). The active site distribution on V2O5/WO3-TiO2 was also clarified quantitatively. NOx adsorption took place on [V4+]-OH + [V5+]-O, [V5+]-OH, and [Ti4+](2)-O, the surface concentrations of which were 24, 28 and 26 mu mol g(-1), respectively, whereas NH3 was activated on [V4+]-OH + [V5+]-O, [V5+]-OH, [Ti4+](2)-O and W species, with concentrations of 24, 28, 26 and 274 mu mol g(-1), respectively. The V and W species did not distribute as a monolayer. The nitrite path, referring to the reaction between adsorbed NH3 and nitrite species to produce N2 and water (H2O), contributed to standard and fast SCR mechanisms, but the NH4NO3 path, referring to the reaction between the NO gas and NH4NO3 formed from the surface nitrates and adsorbed NH3 species to emit NO2, H2O and N-2, did not occur at low temperatures without H2O. Both the NH4NO3 path and the nitrite path contributed to NH3-SCR with H2O in the gas feed. The presence of H2O increased the amounts of the adsorbed nitrates and ammonia at 150 degrees C, but hindered the reaction between the adsorbed NH3 and NO gas, lowering the SCR activity.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43160]
专题	生态环境研究中心_大气污染控制中心
作者单位	1.Chinese Acad Sci, Ctr Excellence Reg Atmospher Environm, Inst Urban Environm, Xiamen 361021, Fujian, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Editorial Off Journal Environm Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Liu, Kuo,Yan, Zidi,He, Hong,et al. The effects of H2O on a vanadium-based catalyst for NH3-SCR at low temperatures: a quantitative study of the reaction pathway and active sites[J]. CATALYSIS SCIENCE & TECHNOLOGY,2019,9(20):5593-5604.
APA	Liu, Kuo,Yan, Zidi,He, Hong,Feng, Qingcai,&Shan, Wenpo.(2019).The effects of H2O on a vanadium-based catalyst for NH3-SCR at low temperatures: a quantitative study of the reaction pathway and active sites.CATALYSIS SCIENCE & TECHNOLOGY,9(20),5593-5604.
MLA	Liu, Kuo,et al."The effects of H2O on a vanadium-based catalyst for NH3-SCR at low temperatures: a quantitative study of the reaction pathway and active sites".CATALYSIS SCIENCE & TECHNOLOGY 9.20(2019):5593-5604.