Abstract
A novel Ti4+ and Sn4+ co-incorporated CeO2-MnOx based catalyst was synthesized by an inverse co-precipitation method with the purpose of inhibiting the formation of N2O and enhancing the NOx conversion of CeO2-MnOx catalyst for NH3-SCR at low temperature. The obtained catalysts were characterized by a series of XRD, Raman, N2-physisorption, NH3-TPD, H2-TPR, XPS, and in situ DRIFTS techniques in details. The experiment results suggested that CeO2-MnOx-TiO2-SnO2 (Ce-Mn-Ti-Sn) catalyst displayed the optimal catalytic performance with an enhancement of 30% compared with CeO2-MnOx (Ce-Mn) in the range of 225–275 °C. Moreover, the N2O formation was inhibited remarkably compared to Ce-Mn (152 ppm), and there was no N2O (0 ppm) detected even at 250 °C. This is linked to moderate weakening of redox property, more generation of acid sites, enhancement of acidic strength, as well as large amount of Ce3+, oxygen vacancies, and absorbed oxygen species, which are contributed to improving the chemical property of Ce-Mn-Ti-Sn catalyst, and further enhancing the catalytic performance and inhibiting the generation of N2O.
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