Low-temperature NO reduction performance of peanut shell-derived few-layer graphene loaded CeCo<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> catalyst
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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 NH<sub>3</sub>-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<sub>x</sub> 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<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> > 5% CeMnO<sub>3</sub> > 5% CeCoO<sub>3</sub>. 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<sub>β</sub>) to the adsorbed oxygen (O<sub>α</sub>), and enhance the redox performance. CeCo<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> exhibited better low-temperature activity, and the conversion rate of NO<sub>x</sub> reached 97.0% at 200 °C, and had excellent SO<sub>2</sub> resistance.
