Polyol-Mediated Synthesis of V2O5-WO3/TiO2 Catalysts for Low-Temperature Selective Catalytic Reduction with Ammonia

We demonstrated highly efficient selective catalytic reduction catalysts by adopting the polyol process, and the prepared catalysts exhibited a high nitrogen oxide (NOx) removal efficiency of 96% at 250 degrees C. The V2O5 and WO3 catalyst nanoparticles prepared using the polyol process were smaller (similar to 10 nm) than those prepared using the impregnation method (similar to 20 nm), and the small catalyst size enabled an increase in surface area and catalytic acid sites. The NO chi removal efficiencies at temperatures between 200 and 250 degrees C were enhanced by approximately 30% compared to those of the catalysts prepared using the conventional impregnation method. The NH3-temperature-programmed desorption and H-2-temperature-programmed reduction results confirmed that the polyol process produced more surface acid sites at low temperatures and enhanced the redox ability. The in situ Fourier-transform infrared spectra further elucidated the fast absorption of NH3 and its reduction with NO and O-2 on the prepared catalyst surfaces. This study provides an effective approach to synthesizing efficient low-temperature SCR catalysts and may contribute to further studies related to other catalytic systems.