The promotion effect of Co doping on the K resistance of Mn/TiO2 catalyst for NH3-SCR of NO

• Mn–Co/TiO2 catalyst has better K resistance than Mn/TiO2 catalyst.
• The NH3-SCR reaction over Mn/TiO2 and Mn–Co/TiO2 follows the Langmuir–Hinshelwood mechanism.
• The doping of Co on Mn/TiO2 catalyst could enhance its reducibility and the adsorption of NH3 species and NOx species on it.
• The absorbed NH3 species on Mn/TiO2 and Mn–Co/TiO2 are more active than the absorbed NOx species on them.
• The addition of K on Mn–Co/TiO2 catalyst has little inhibition effect on the adsorption of NOx species.

In this study, it was found that the doping of Co on Mn/TiO2 catalyst could enhance its K resistance. The characterization results showed that the modification of Mn/TiO2 catalyst by Co could increase its reducibility and the adsorption of NH3 and NOx species on it. From the results of in situ DRIFT study, the NH3-SCR reaction over Mn/TiO2 catalyst obeyed the Langmuir–Hinshelwood mechanism. And the addition of K on Mn–Co/TiO2 had little inhibition effect on NOx adsorption. These features made Mn–Co/TiO2 catalyst show better K resistance than Mn/TiO2.

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