Ti³⁺ doped V₂O₅/TiO₂ catalyst for efficient selective catalytic reduction of NO_x with NH₃

The effect of self-doping Ti³⁺ into V₂O₅/TiO₂ catalysts on the activity of the catalysts was assessed by the selective catalytic reduction of NO_X with NH₃ (NH₃-SCR). 0.2-V₂O₅/TiO₂ (Al(acac)₃:TBOT = 0.2%) catalyst had the highest catalytic activity at low-temperature range. The as-prepared catalysts are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), H₂ temperature-programmed reduction (H₂-TPR), NH₃ temperature-programmed desorption (NH₃-TPD), surface area and pore structure. XPS and EPR were used to confirm the existence of Ti³⁺ and oxygen vacancy in the catalysts. The specific surface area, surface acidity, reducibility and valence state of the active components of the catalysts are significantly affected by the self-doping of Ti³+. This work would lead to a new strategic design of Ti³⁺ self-doped catalysts with fine structure and that can efficiently improve low-temperature SCR performance.