NOx-assisted soot combustion over dually substituted perovskite catalysts La1−xKxCo1−yPdyO3−δ

- Dually substituted La0.9K0.1Co0.95Pd0.05O3−δ is highly active for soot oxidation.
- K/Pd co-substitution increases the reducibility and oxidibility of the catalyst.
- Surface adsorbed oxygen species are identified as the main active oxygen species.
- Pd3+ and Pd4+ ions are more capable for NO oxidation and soot combustion than Pd2+.
- Soot can be oxidized not only by the surface adsorbed oxygen but also by NO2.