CeO(2) supported on reduced TiO(2) for selective catalytic reduction of NO by NH(3).

In this paper, a series of catalysts about CeO active sites prepared using reduced TiO (TiR) as supports were firstly used for selective catalytic reduction (SCR) of NO by NH. The catalytic performance evaluation results showed that the NO removal efficiency of CeO/TiR (CeTiR) was much higher than that of CeO/TiO (CeTi). Hence, the aim of this study was to investigate the promotion mechanism of catalytic performance of CeTiR catalysts. The catalysts were characterized by XRD, BET, Raman, XPS, NH-TPD and H-TPR. The results of characterization revealed that CeO had a strong interaction with oxygen vacancies of TiR supports. The strong interaction resulted in more Ce formation and better redox properties for CeTiR catalysts. In addition, it was confirmed that the better redox properties of CeTiR could be considered as the major reason of its high SCR activity via L-H mechanism but not acid properties. We expected that this study could shed some lights on the development of SCR catalysts for improving the interaction between Ti support and active species for enhancing SCR reaction.