Surface characterization studies on the interaction of V2O5–WO3/TiO2 catalyst for low temperature SCR of NO with NH3

• Interaction of V, W and Ti species improved the SCR reaction at low-temperature.
• Hybridization between WO3 and V2O5 improved the reducibility and reduced V2O5 species formation of V2O5–WO3/TiO2 catalyst.
• The interaction improved the NO oxidation and NO3−NO3− decomposition over V2O5–WO3/TiO2 catalyst.

This study aimed at elucidating the surface characterization of V2O5–WO3/TiO2 catalyst to investigate the interaction of V, W and Ti species for the improvement of the catalytic activity in the SCR reaction at low-temperature. Analysis by XRD, UV–vis, PL spectra and DFT theoretical calculations, XPS, EPR and in situ DRIFT showed that WO3 could interact with TiO2 to improve the electrons transfer, and the WO3 hybridization with V2O5 could also improve the reducibility and formation of reduced V2O5 species for the V2O5–WO3/TiO2 catalyst. These aspects resulted in the NO oxidation and NO3−NO3− decomposition that were responsible for the high catalytic activity of V2O5–WO3/TiO2 catalyst.

Interaction of V, W and Ti species improved the formation of reduced V2O5 and O2−O2−, NO oxidation and NO3−NO3− decomposition to enhance the catalytic activity of VWTi catalyst.Figure optionsDownload as PowerPoint slide