Tungsten Oxide Modified V2O5-Sb2O3/TiO2 Monolithic Catalyst: NH3-SCR Activity and Sulfur Resistance

In this study, a V2O5-Sb2O3/TiO2 monolithic catalyst was modified by introducing WO3. The WO3-modified catalyst exhibited enhanced catalytic activity in the measuring temperature range of 175-320 degrees C. The changes in dispersion of vanadia species were investigated by ultraviolet-visible (UV-Vis) spectroscopy and H-2 temperature-programmed reduction (H-2-TPR). A durability test was conducted in a wet SO2-containing atmosphere at 220 degrees C for 25 h. The sulfate deposition was estimated by temperature-programmed decomposition (TPDC) of sulfates, thermo-gravimetric (TG) analysis, and temperature-programmed desorption (TPD) of NH3. Isothermal SO2 oxidation and temperature-programmed surface reaction (TPSR) of NH4HSO4 with NO were performed. Based on these characterizations, effects of WO3 modification on the sulfate tolerance of the catalyst were explored.

Automated summary

In this study, a V2O5-Sb2O3/TiO2 monolithic catalyst was modified with WO3, leading to enhanced catalytic activity in the temperature range of 175-320 degrees C. Characterization techniques such as UV-Vis spectroscopy, H-2-TPR, TPDC, TG analysis, TPD, isothermal SO2 oxidation, and TPSR were used to investigate the effects of WO3 modification on the sulfate tolerance of the catalyst.