The effect of Ce on a high-efficiency CeO2/WO3-TiO2 catalyst for the selective catalytic reduction of NOx with NH3

In this study, W0.1TiOx and CeaW0.1TiOx ( a = 0.1, 0.2, 0.5, 1.0) catalysts were prepared by a novel stepwise precipitation approach. The CeaW0.1TiOx catalysts showed much better activities and N-2 selectivity than W0.1TiOx. Particularly, the Ce0.2W0.1TiOx (CeO2/WO3-TiO2) catalyst showed excellent catalytic performance in a broad temperature range from 200 to 450 degrees C, under a high GHSV condition of 400 000 h(-1). Characterizations revealed that the novel preparation approach can achieve highly dispersed Ce species on the surface of the catalyst, and the Ce species could induce enhanced charge imbalance, superior redox functions, and outstanding adsorption and activation properties for NOx and NH3, which is the main reason for the highly efficient NOx abatement capability of the CeO2/WO3-TiO2 catalyst.