Preparation and characterization of CeO2–Fe2O3 catalysts for the selective catalytic reduction of NO with CO

The catalytic performance of CeO2–Fe2O3 catalysts for the selective catalytic reduction of NO by CO was studied. The results showed that the addition of CeO2 can reduce the catalytic reaction temperature. The NO conversion of CeO2–Fe2O3 catalyst (Ce/Fe = 0.1) was more than 90% in the reaction temperature range of 250–650 °C. XRD, BET, XPS, TPR, TPD and in situ DRIFTS showed that with increasing Ce/Fe, the main phase of the catalyst was gradually transformed from iron oxide (Fe2O3) to ceria (CeO2), and the specific surface area gradually increased, which can facilitate the enrichment of Ce on the catalyst surface and improve the redox capacity and adsorption properties. The lattice oxygen released by CeO2 was converted into adsorbed oxygen, and the redox reaction of Ce4+/Ce3+ and Fe3+/Fe2+ on the catalyst surface was beneficial to the storage and release of oxygen, CO and NO on the surface, thus improving the denitration performance. Moreover, the reaction of in situ infrared surface catalysts was a combination of the Langmuir–Hinshelwood mechanism and the Eley–Rideal mechanism.