Low-temperature NO reduction performance of peanut shell-derived few-layer graphene loaded CeCo_xMn_1-xO₃ catalyst

The catalysts were prepared by the hydrothermal method using agricultural waste biomass peanut shell-derived few-layer graphene (PS-FLG) as the support. The NO reduction performance test of NH₃-SCR and various characterization means were employed to preliminarily explore the mechanism of Co-doping activity at the B site. The results showed that the conversion rate of NO_x of the three catalysts reached 99.1% and remained stable in the range of 250 ∼ 400 °C. The order of activity at low temperature was 5% CeCo_0.5Mn_0.5O₃ > 5% CeMnO₃ > 5% CeCoO₃. Partial doping of Co could inhibit the aggregation of active components, increase the percentage of high valence ions, improve the migration of lattice oxygen (O_β) to the adsorbed oxygen (O_α), and enhance the redox performance. CeCo_0.5Mn_0.5O₃ exhibited better low-temperature activity, and the conversion rate of NO_x reached 97.0% at 200 °C, and had excellent SO₂ resistance.