Abstract
A series of CuCe catalysts were prepared by an incipient-wetness impregnation method for selective catalytic reduction of NO in combination with dielectric barrier discharge plasma. The effect of the Cu/Ce mass ratio on NO and NOx (NO+NO2) removal efficiency has been studied as a function of energy density at ambient temperature. The catalyst samples were characterised by BET, XRD, XPS, H2-TPR and NH3-TPD. The results indicated that catalyst addition enhances NO and NOx removal based on only the plasma process. The CuCe catalysts exhibited higher reduction performance compared with the 4wt.% Cu or 4wt.% Ce catalysts, and the catalyst with 4wt.% Cu and 4wt.% Ce showed the best reduction performance with the highest NO and NOx removal efficiencies of 90.7% and 80.1%, respectively, at an energy density of 367J/L. The interactions between Cu and Ce increase oxygen migration to form oxygen vacancies, which facilitates the oxidation of NO to NO2, and NO2 favours NO removal via a fast selective catalytic reduction reaction at low temperature. In addition, the CuCe catalysts exhibited low thermal stability, thereby facilitating the catalytic reduction of NO at ambient temperature.
Published Version
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