Effects of Fe addition on the structure and catalytic performance of mesoporous Mn/Al–SBA-15 catalysts for the reduction of NO with ammonia

• Addition of Fe to Mn/AS(573) lowers the binding energy of Mn by about 0.4 eV.
• The appropriate Mn4 +/Mn3 + ratio may have a great effect on the reduction of NO.
• The iron addition greatly enhances the redox properties of Mn–Fe/AS(573).
• The Mn–Fe/AS(573) catalyst showed almost 100% conversion at 453–663 K.

Mesoporous Al–SBA-15 has been synthesized by a hydrothermal method and used as a support for Mn/Al–SBA-15, Fe/Al–SBA-15, and Mn–Fe/Al–SBA-15 catalysts. XRD, N2 sorption, XPS, H2-TPR and activity tests have been used to assess the properties of catalysts. The Mn–Fe/Al–SBA-15 catalyst exhibited a higher SCR activity than Mn/Al–SBA-15 or Fe/Al–SBA-15 due to a synergistic effect between Mn and Fe. After the addition of Fe, the binding energy of Mn 2p3/2 on Mn–Fe/Al–SBA-15(573) decreased by about 0.4 eV and the Mn4 +/Mn3 + ratio decreased to 1.10. The appropriate Mn4 +/Mn3 + ratio may have a great effect on the reduction of NO over Mn–Fe/Al–SBA-15(573) catalyst.

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