Research Progress in Vanadium-Free Catalysts for the Selective Catalytic Re-duction of NO with NH3

Abstract

Selective catalytic reduction of NO with NH3(NH3-SCR) is a well-proven technique for the removal of NOx from stationary sources such as coal-fired power plants,and is also one of the most promising techniques for the NOx elimination from diesel exhaust under oxygen-rich conditions. Due to some inevitable disadvantages of the present V2O5-WO3(MoO3) /TiO2 catalyst for industrial use,many researchers focus on the development of novel,highly efficient,stable,environmental-friendly and vanadium-free NH3-SCR catalysts. The research progress in the field of vanadium-free NH3-SCR catalysts is reviewed,including zeolite catalysts(such as Fe-zeolite catalysts and Cu-zeolite catalysts) and oxide catalysts(such as Fe-based oxide catalysts,Mn-based oxide catalysts,and other vanadium-free oxide catalysts) . Several aspects in this field,including the evaluation of catalytic performance,the structure analysis of active sites,the improvement of low temperature activity,the study of NH3-SCR reaction mechanism,the enhancement of H2O/SO2 durability,and the feasibility analysis for industrial use,have been discussed in detail. The possible developing orientation and research interests in the field of vanadium-free NH3-SCR catalysts are previewed.