Dynamic Tuning of Oxygen Vacancies in Mn-Ce Catalysts via the Electron Complementary Effect for Enhanced Reduction of...

Developing efficient nonprecious metal catalysts for NO reduction using CO under O₂-containing conditions has always been the focus of attention. In this study, the asymmetric Mn-O_v-Ce structure was constructed on the Mn-Ce catalyst via a coprecipitation strategy. The optimized Mn_0.2Ce_0.8O₂ catalyst exhibited superior catalytic performance, achieving 90% NO conversion and 95% N₂ selectivity at 260 °C under 5% O₂. Characterizations and theoretical calculations revealed that the asymmetric Mn-O_v-Ce configuration promoted electron delivery between Mn and neighboring Ce, facilitating the generation of dynamic O_v. Furthermore, in situ DRIFTS and DFT calculations demonstrated that the incorporated Mn was favorable to a faster consumption of intermediates and the dynamic replenishment of O_v on the CeO₂ surface, thus promoting the catalytic performance. This study provides an efficient scheme for designing high-efficiency performance Ce-based catalysts by tuning the electronic structure of CeO₂ for NO reduction by CO under the O₂-containing conditions.