Enhanced activity of tungsten doped CeAlOX catalysts for the selective catalytic reduction of NOx with NH3

A series of tungsten modified CeAlOx catalysts prepared by the homogeneous co-precipitation method were used for the selective catalytic reduction NOx with NH3. The activity evaluation results exhibited that the activity of CeAlOx was enhanced by the addition of tungsten, and the CeWAlOx catalyst also showed high resistance to SO2 and H2O poisoning at 300 °C. The BET analysis results showed that the total pore volume and the average pore diameter of the CeAlOx catalyst was improved by the addition of WO3.The NH3-TPD, in situ DRIFTS, H2-TPR and XPS characterization results displayed that the introduction of tungsten could enhance the amount of acid sites, the adsorbability to the NH3, the redox ability and the amount of oxygen vacancies, which should be the critical factors for the CeWAlOx catalyst to achieve high NH3-SCR performance.