Effect of the addition of Ce to MnOx/Ti catalyst on reduction of N2O in low-temperature SCR

The effect of MnOx/Ti catalyst doped with Ce prepared by sol-gel method at a low temperature on N2O formation during the selective catalytic reduction of NO with NH3 was studied in detail. Results showed that the production of N2O was primarily controlled by two paths: (1) direct reaction of NO and NH3 and (2) oxidation of NH3 with O-2. The overoxidation of NH3 was the dominant step in N2O reduction. Addition of Ce to MnOx/Ti catalyst increased the proportion of lattice oxygen on the catalyst surface. Meanwhile, the stability of lattice oxygen, which contributed to the decrease in N2O formation by inhibiting the overoxidation of NH3, on the catalyst surface was the best when the Ce/Ti mole ratio reached 0.1. (c) 2014 Curtin University of Technology and John Wiley & Sons, Ltd.