Surface characterization studies on F-doped V2O5/TiO2 catalyst for NO reduction with NH3 at low-temperature

This study aimed at elucidating the surface characterization of F-doped V2O5/TiO2 catalyst to investigate the improvement of F doping for the catalytic activity in the SCR reaction at low-temperature. Analysis by PL spectra and DFT theoretical calculations showed that F doping improved the interaction of V species with TiO2 by oxygen vacancies and the electrons in oxygen vacancies were captured by V species. It could facilitate the formation of the reduced V species. The results of XPS, O-2-TPD and EPR confirmed that the formation of the reduced V species, as well as the reduced V species were the active sites for the formation of superoxide ions. By the above process, NO oxidation was improved by F doping, which were beneficial for the SCR reaction. Moreover, the surface reaction characterization of VTiF catalyst was investigated that the nitrite and nitrate species of NO oxidation could react with Bronsted acid sites and Lewis acid sites over the F-doped V2O5/TiO2 catalyst. (C) 2014 Elsevier B.V. All rights reserved.