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

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⁻ decomposition that were responsible for the high catalytic activity of V₂O₅–WO₃/TiO₂ catalyst. - Graphical abstract: Interaction of V, W and Ti species improved the formation of reduced V₂O₅ and O₂⁻, NO oxidation and NO₃⁻ decomposition to enhance the catalytic activity of VWTi catalyst. - Highlights: • 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⁻ decomposition over V₂O₅–WO₃/TiO₂ catalyst