Research progress on rare earth-based catalysts for SCR with wide temperature window
Nitrogen oxides(NOx)are important precursors of haze,acid rain and ozone,and flue gas deni-trification of stationary sources such as coal-fired power plants and mobile sources such as diesel vehicles is imminent.Ammonia selective catalytic reduction(NH3-SCR)is currently the most effective flue gas/exhaust denitrification technology.In order to meet NOx emission standards,NH3-SCR catalysts need to have efficient denitrification activity and stability over a wide temperature range.Rare earth materials have a wide range of applications in denitrification due to their unique electronic structure,adjustable surface acidity and redox properties.The latest research progress of medium-low and medium-high temperature rare earth-based metal oxide SCR denitrification catalysts,the preparation methods of molecular sieve SCR denitrification catalysts,including ion exchange method,one-pot method and green synthesis method,are reviewed,and the current research hotspots and challenges of wide-temperature SCR catalysts are summarized.
catalyst engineeringwide temperature windowrare earth-based catalysts for SCRmetal oxidesmolecular sieves
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