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 (DeNOx) 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 DeNOx 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 DeNOx 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.