A highly efficient CeWOx catalyst for the selective catalytic reduction of NOx with NH3

Abstract

In this study, two methods were used to prepare Ce–W oxide catalysts. The CeWO_x catalyst prepared by the homogeneous precipitation method showed excellent NH₃-SCR performance, with over 80% NO_x conversion obtained from 225 to 450 °C under a high GHSV of 300 000 h⁻¹. Characterization revealed that the homogeneous precipitation method can achieve highly dispersed active species and intense interaction between the Ce and W species on the CeWO_x catalyst, and thus result in enhanced charge imbalance, superior redox functions, and outstanding adsorption and activation properties for the reactants, which are the main reasons for the highly efficient NO_x abatement of the CeWO_x catalyst.