Research Progress of NH3-SCR Catalysts with Wide Temperature Window
Selective catalytic reduction of NOx by NH3(NH3-SCR)is the most effective technology for reducing NOx emissions from vehicles.With the upgrading of China automobile exhaust emission standards from"ChinaⅤ"to"China Ⅵ",and the application of hybrid electrical vehicle,NH3-SCR catalysts should have higher NOx conversion efficiency in a wide temperature range(200～550 ℃).This paper reviews the research progress on NH3-SCR catalysts with broad active temperature ranges,primarily summarizing the impact of physicochemical properties and structural characteristics such as surface acidity,redox properties,specific surface area,porosity,and crystal grain state on the denitration temperature range of these catalysts.The exploration of FeMn-based ze-olite molecular sieve NH3-SCR catalysts is discussed,and the research prospects and directions for NH3-SCR catalysts with broad active temperature ranges are also anticipated.
NH3-SCRdenitrationwide temperature windowreaction mechanism
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