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

Abstract

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.