期刊
CATALYSIS TODAY
卷 153, 期 3-4, 页码 70-76出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.02.043
关键词
Selective catalytic reduction; Iron titanate catalyst; Mn substitution; SCR mechanism; Ammonium nitrate; H2O/SO2 inhibition effect
资金
- Chinese Academy of Sciences [KZCX1-YW-06-04]
- National High Technology Research and Development Program of China [2009AA064802, 2009AA06Z301]
Selective catalytic reduction (SCR) of NO with NH3 over Mn substituted iron titanate catalyst (Fe-0 75 Mn0 25TiOx) was fully investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy. At relatively low temperatures, both ionic NH4+ and coordinated NH3 contributed to the SCR reaction, and both bridging nitrate and monoclentate nitrate were confirmed to be the reactive nitrate species In the SCR reaction condition. surface NH4NO3 species was formed as intermediate species and its reactivity was also proved. An NH3-SCR mechanism over Fe0 75Mn0 25TiOx at low temperatures was proposed accordingly, in which the reduction of NH4NO3 by NO was possibly the rate-determining step. Due to the mild and reversible inhibition effect of H2O on NH3/NOx adsorption, the SCR activity decline in the presence of H2O was also slight and recoverable, however, the inhibition effect of SO2 was much more intense and irreversible, because the formation of nitrate species was totally inhibited by the formation of sulfate, resulting in the cut-off of the SCR reaction pathway at low temperatures (C) 2010 Elsevier B V All rights reserved
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据