Patil, S.S.Naik, S.Ramesh, M.D.Harshini, H.Prasad Dasari, H.P.2026-02-042022Chemical Engineering and Technology, 2022, 45, 3, pp. 517-5259307516https://doi.org/10.1002/ceat.202100523https://idr.nitk.ac.in/handle/123456789/22640Niobium-doped ceria catalysts were synthesized to study soot oxidation activity. X-Ray diffraction (XRD) and Raman analysis of the samples revealed the presence of a fluorite structure of CeO<inf>2</inf> for all the doped samples. The T<inf>50</inf> temperature of the pure CeO<inf>2</inf> sample was more significant than that of bare soot. The high catalytic activity of the CeO<inf>2</inf> catalyst can be attributed to the low crystallite size, high facet ratio, and the large Brunauer-Emmett-Teller (BET) surface area as compared to Nb-doped samples. The activation energy calculated by both Ozawa and KAS methods were found to be low for CeO<inf>2</inf> when compared to Nb-doped samples. CeO<inf>2</inf> resulted in better soot oxidation activity with low activation energy. © 2022 Wiley-VCH GmbHActivation energyCatalyst activityCrystallite sizeDustFluorsparNiobiumNiobium compoundsOxidationSootCeria catalystsDiffraction analysisDoped ceriaDoped sampleEffect of niobiumNb dopedOxidation activitiesSoot oxidationSynthesisedX- ray diffractionsCerium oxide