The promotion effect of Sb on the Na resistance of Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3

• Mn–Sb/TiO2 catalyst shows higher NH3-SCR activity and wider temperature window than Mn/TiO2 catalyst.
• Mn–Sb/TiO2 catalyst has much better Na-resistance than Mn/TiO2 catalyst.
• The addition of Sb on Mn/TiO2 catalyst can improve its low-temperature reducibility.
• The addition of Sb on Mn/TiO2 catalyst can generate strong Lewis acid sites for NH3 adsorption.

Na has a serious deactivation effect on Mn/TiO2 catalyst for selective catalytic reduction of NO with NH3. In this study, it was found that Sb had a promotion effect on the Na resistance of MnOx/TiO2 catalyst. Then the promotion mechanism was investigated based on the characterization results of BET, XRD, H2-TPR, NH3-TPD, XPS and in situ DRIFT. The results of H2-TPR and NH3-TPD showed that the addition of Sb on MnOx/TiO2 could enhance the redox ability and surface acidity respectively, and the results of DRIFT indicated that the addition of Sb on MnOx/TiO2 could generate strong Lewis acid sites on the catalyst surface for NH3 adsorption. Therefore, the doping of Sb has a promotion effect on the Na resistance of Mn/TiO2 catalyst.

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