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

Abstract

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.