Structural effects of iron spinel oxides doped with Mn, Co, Ni and Zn on selective catalytic reduction of NO with NH3

- Mn, Co, Ni and Zn are doped into the structure of iron spinel oxides.
- Surface acidity and redox properties are related to iron spinel structures.
- Competition of NH3-CR and NH3-CO exists over metal-doped iron spinel catalysts.
- SCR performance is affected by the redox cycle of Fe3+/Fe2+ in octahedral sites.