Fe-promoted V/W/TiO₂ catalysts for enhanced low-temperature denitrification efficiency

Research on low-temperature ammonia selective catalytic reduction (NH₃-SCR) is being actively conducted to reduce the operating costs of environmental facilities and fulfill stringent environmental regulations. The main limitation of these catalysts is the low denitrification (DeNO_x) efficiency of flue gas at temperatures below 200 °C. In this study, the effect of Fe doping on the low-temperature SCR activity of V/W/TiO₂ catalysts was investigated. The addition of 0.5 wt% Fe to V/W/TiO₂ catalysts resulted in excellent DeNO_x efficiency (84%) at 180 °C. The presence of Fe as a structural and electronic promoter in the V/W/TiO₂ catalyst increased the dispersion of W⁵⁺, Fe³⁺, and non-stoichiometric V⁴⁺ species and improved the redox properties of the catalyst. In addition, the DeNO_x efficiency of low-temperature NH₃-SCR was greatly affected by the adsorption capacity of the NH₃-Lewis acid sites and the reoxidation ability of the V/W-0.5Fe/TiO₂ catalyst.