Selective catalytic reduction of NOx with NH3 over MoO3/Mn-Zr composite oxide catalyst

MO3-doped Mn-Zr composite oxide catalyst has been developed for the NOx reduction by NH3. The introduction of MoO3 exerted significant effect on the activity and N-2 selectivity of Mn-Zr composite oxide for the catalytic removal of NOx. The synergistic effect between MoO3 and Mn-Zr contributes to generating more acid sites, which not only suppressed the formation of inactive nitrate but also benefited the adsorption and activation of NH3. Moreover, the strong interaction between MoO3 and MnOx resulted in the decreased redox ability of MnOx and more Mn3+ formed, thus remarkably enhancing the N-2 selectivity. Therefore, MO3/Mn-Zr catalyst is active and highly selective for the NOx reduction. The present research shed light on the design of novel NH3-SCR catalyst by adjusting the redox ability and surface acidity.