Promotion effect of Ce and Ta co-doping on the NH 3 -SCR performance over V 2 O 5 /TiO 2 catalyst.

NH ₃ -SCR (SCR: Selective catalytic reduction) is an effective technology for the de-NO _x process from both mobile and stationary pollution sources, and the most commonly used catalysts are the vanadia-based catalysts. An innovative V ₂ O ₅ -CeO ₂ /TaTiO _x catalyst for NO _x removal was prepared in this study. The influences of Ce and Ta in the V ₂ O ₅ -CeO ₂ /TaTiO _x catalyst on the SCR performance and physicochemical properties were investigated. The V ₂ O ₅ -CeO ₂ /TaTiO _x catalyst not only exhibited excellent SCR activity in a wide temperature window, but also presented strong resistance to H ₂ O and SO ₂ at 275 ℃. A series of characterization methods was used to study the catalysts, including H ₂ -temperature programmed reduction, X-ray photoelectron spectroscopy, NH ₃ -temperature programmed desorption, etc. It was discovered that a synergistic effect existed between Ce and Ta species. The introduction of Ce and Ta enlarged the specific surface area, increased the amount of acid sites and the ratio of Ce ³⁺ , (V ³⁺ +V ⁴⁺ ) and O _α , and strengthened the redox capability which were related to synergistic effect between Ce and Ta species, significantly improving the NH ₃ -SCR activity.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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