Study on the effect of preparation method on denitration performance of Co-modified Ce/TiO₂ catalyst

This study systematically conducted preparation optimization and performance investigations on Co-modified Ce/TiO2 catalysts, with a focus on examining how preparation methods and Co loading regulate the catalyst’s low-temperature denitrification activity. After identifying optimal preparation parameters via condition screening, multiple characterization techniques-including BET, XRD, XPS, H2-TPR and in situ DRIFTS-were employed to deeply analyze the catalyst’s physicochemical properties and reaction mechanism. Results demonstrated that compared to the impregnation and co-precipitation methods, the Ce-Co0.025/TiO2-SG catalyst (prepared by the sol-gel method with a Co/Ti mass ratio of 0.025) exhibited significantly superior denitrification activity: NO conversion remained stably above 95% in the 225−350 °C temperature range, and it displayed high N2 selectivity. Characterization analysis revealed that abundant surface oxygen vacancies, a high proportion of Ce3+ species, and prominent acidic sites collectively contributed to enhancing its low-temperature denitrification performance. This work provides reference value for the development of highly efficient low-temperature denitrification catalysts.