Mechanisms study of silicotungstic acid modified CeO2 catalyst for selective catalytic reduction of NOx with NH3: Effect of pH values

136Silicotungstic acid modified CeO2 catalysts (SC) were prepared by a facile one pot method and used for the selective catalytic reduction (SCR) of NO with NH3. Monodentate nitrate and bridging nitrate could react with NH4+ to produce NH4NO3, and then reduced by NO to form NO2. Bidentate nitrate and NO2 reacted with coordinated NH3 to generate N2 and H2O.