Ce1-xFexVO4 with Improved Activity for Catalytic Reduction of NO with NH3

A series of Ce1-xFexVO4 (x = 0, 0.25, 0.50, 0.75, 1) catalysts prepared by modified hydrothermal synthesis were used for selective catalytic reduction (SCR) of NOx with NH3. Among them, Ce0.5Fe0.5VO4 showed the highest catalytic activity. The catalysts were characterized by X-ray diffraction (XRD), N-2 adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction using H-2 (H-2-TPR), and temperature-programmed desorption of NH3 (NH3-TPD). The results indicated the formation of Ce-Fe-V-O solid solutions. The average oxidation states (AOS) of Ce, Fe, V, and O atoms changed obviously with the incorporation of Fe3+ into CeVO4, and the acidity of Ce0.5Fe0.5VO4 differs from that of CeVO4 and FeVO4. The presence of more acid sites and a sharp increase in active oxygen species in Ce0.5Fe0.5VO4 effectively improved the selective catalytic reduction (SCR) activity.

Automated summary

A series of Ce1-xFexVO4 catalysts prepared by modified hydrothermal synthesis were found to exhibit good catalytic activity in selective catalytic reduction (SCR) of NOx with NH3. Among them, Ce0.5Fe0.5VO4 showed the highest catalytic activity. Characterization analysis revealed the formation of Ce-Fe-V-O solid solutions in Ce0.5Fe0.5VO4, along with significant changes in the average oxidation states of Ce, Fe, V, and O atoms. The presence of more acid sites and active oxygen species in Ce0.5Fe0.5VO4 effectively enhanced the SCR activity.