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 degrees 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 degrees 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 H-2-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.

Automated summary

NH3 treatment significantly improves the De-NO efficiency of CeO2 nanorods catalyst, especially in the temperature range of 160-410 degrees C. NH3 treatment promotes the production of Ce3+ on the surface of CeO2 catalyst, leading to more oxygen vacancies and enhanced SCR reaction. Additionally, NH3 treatment disrupts the crystallinity of CeO2 catalyst, enhances its reducibility, and increases the content of active functional groups on the surface.