Roles of Nitrates species over MnOx-CeO2-SnO2 Catalyst for Low Temperature Selective Catalytic Reduction of NOX by NH3
Introduction Selective catalytic reduction (SCR) of NOX with NH3 is an efficient and widely used technology and it has a relative high conversion at 350-400℃ on V2O5-WO3(MoO3)/TiO2 catalyst 1. But this technology still has problems, such as the performance suppression by high concentration of ash in the flue gas, the toxicity of vanadium pentoxide to the environment, and the deactivation of vanadia-based catalysts by SO2 2.Some transition-metal oxides catalysts have been investigated for SCR reaction of NOX at low temperature, such as MnOx-CeO2 and other oxidesl-3. They showed various SCR activities below 200 ℃ under different conditions. In our previous work, NH3 can be favorably chemically adsorbed on the surface of SnO2 to form a NHj-Sn bond because of the strong Lewis acidity of Sn cations4. SO2 and water vapor are the main components which lead to catalysts deactivation for NH3-SCR of Nox. This paper showed that MnOx-CeO2-SnO2 catalyst was a superior catalyst for NOX reduction by NH3 at 80-250 ℃, and the mechanisms of low temperature SCR were proposed, effects of SO2 and H2O were investigated.
Huazhen Chang Junhua Li Jiming Hao
School of Environment, Tsinghua University, Beijing 100084 China
国际会议
北京
英文
301-302
2011-11-24（万方平台首次上网日期，不代表论文的发表时间）