Effect of the addition of Ce to MnO x /Ti catalyst on reduction of N 2 O in low‐temperature SCR

The effect of MnO x /Ti catalyst doped with Ce prepared by sol–gel method at a low temperature on N 2 O formation during the selective catalytic reduction of NO with NH 3 was studied in detail. Results showed that the production of N 2 O was primarily controlled by two paths: (1) direct reaction of NO and NH 3 and (2) oxidation of NH 3 with O 2 . The overoxidation of NH 3 was the dominant step in N 2 O reduction. Addition of Ce to MnO x /Ti catalyst increased the proportion of lattice oxygen on the catalyst surface. Meanwhile, the stability of lattice oxygen, which contributed to the decrease in N 2 O formation by inhibiting the overoxidation of NH 3 , on the catalyst surface was the best when the Ce/Ti mole ratio reached 0.1. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.