An environmentally friendly FeTiSOx catalyst with a broad operation‐temperature window for the NH3‐SCR of NOx

Abstract

AbstractA novel FeTiSOx catalyst prepared by a simple hydrolysis coprecipitation method was used for the selective catalytic reduction (SCR) of NOx with NH3, which exhibited high catalytic activity (NOx conversion of >97% and N2 selectivity of >95%) and tolerance for both H2O and SO2 at a broad temperature window of ~325–475°C. The characterization results showed that the formation of Fe–O–Ti and Fe–O–S species could significantly enhance the acidic sites of the catalyst, which play an important role in NH3 absorption and their catalytic activity. The Fe3+ ions in the bulk anatase TiO2 could significantly enhance the redox properties for the SCR reaction and suppress the side reaction of NH3 oxidation to NO or N2O. In addition, the reaction mechanism was discussed based on in situ diffuse reflectance infrared Fourier transform spectroscopy measurements and kinetic investigation, indicating that the reaction was dominated by the Eley–Rideal mechanism over the FeTiSOx catalyst.