Abstract
Potassium, as one of the alkali metals, could cause significant deactivation on the Ce-based SCR catalysts. In this work, Zr-doping was found to efficiently enhance the K tolerance of Ce/TiO2 catalyst. The BET, XRD, Raman, XPS, H2-TPR, NH3-TPD, O2-TPD and NOx-TPD were adopted for exploring the mechanism of the promoted anti-K-poisoning property of Ce/TiO2 catalyst. The obtained results demonstrated that Ce/TiO2 with the addition of Zr exhibited larger specific surface area, higher dispersion of Ce species, higher redox property and more acid sites. As a result, the factors mentioned above could efficiently enhance the K tolerance of Ce/TiO2 catalyst. By virtue of the in situ DRIFT analysis, the SCR reaction over Ce/TiZrOx catalyst was accelerated via Langmuir-Hinshelwood (L-H) mechanism.
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