Effect of Ti4+ and Sn4+ co-incorporation on the catalytic performance of CeO2-MnOx catalyst for low temperature NH3-SCR
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.
- Publication:
-
Applied Surface Science
- Pub Date:
- May 2019
- DOI:
- 10.1016/j.apsusc.2019.01.095
- Bibcode:
- 2019ApSS..476..283C
- Keywords:
-
- CeO<SUB>2</SUB>-MnO<SUB>x</SUB>-TiO<SUB>2</SUB>-SnO<SUB>2</SUB> catalyst;
- Ti<SUP>4+</SUP> and Sn<SUP>4+</SUP> co-incorporation;
- Low-temperature NH<SUB>3</SUB>-SCR;
- Catalytic performance;
- By-product N<SUB>2</SUB>O