NH₃ treatment of CeO₂ nanorods catalyst for improving NH₃-SCR of NO

CeO₂ nanorods (CeO₂-NRs) catalyst was prepared and treated with ammonia (NH₃) gas and the effect of NH₃ treatment on CeO₂ nanorods catalyst was also studied for improving NH₃-SCR of NO. And the catalysts were tested for NH₃-SCR of NO during 100–450 °C. The results showed that NH₃ treatment could improve the De-NO efficiency of the catalyst, which increased evidently in the range of about 160–410 °C. XPS results revealed that NH₃ treatment made CeO₂-NRs catalyst produce more Ce³⁺ on its surface, and thereby produced more oxygen vacancies and further promoted SCR reaction. The XRD and H₂-TPR characterization test results indicated that CeO₂ catalyst with NH₃ treatment could destroy its crystallinity and enhance the reducibility. In addition, the in situ DRIFTS results also exhibited more activity functional groups on the surface of N–CeO₂-NRs catalyst than that of CeO₂-NRs catalyst.