Activity of Selective Catalytic Reduction of NO over V 2 O 5 /TiO 2 Catalysts Preferentially Exposed Anatase {001} and {101} Facets

Three V 2 O 5 /TiO 2 catalysts with V 2 O 5 loading of 3 wt% were fabricated by wet impregnation, in which the TiO 2 supports had different crystal types, including the octahedral TiO 2 (preferentially exposed anatase {101} facets, labeled as TiO 2 -O), the sheet TiO 2 (preferentially exposed anatase {001} facets, labeled as TiO 2 -S), and the commercial TiO 2 (TiO 2 -P25), giving the three corresponding catalysts, respectively. The activities and the effects of H 2 O and SO 2 over the V 2 O 5 /TiO 2 catalysts for the selective catalytic reduction (SCR) of NO by NH 3 were investigated. It was found that the crystal facets of TiO 2 nanoparticles played an essential role in the catalytic activity. The V 2 O 5 /TiO 2 -S catalyst exhibited the better catalytic activity than the V 2 O 5 /TiO 2 -O and V 2 O 5 /TiO 2 -P25 catalysts for the NH 3 -SCR reaction. The N 2 sorption isotherm measurement (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (H 2 -TPR), temperature-programmed desorption (NH 3 -TPD), X-ray photoelectron spectra (XPS) and in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) characterizations showed that the good dispersion and reducibility of vanadium species, and the high concentration of chemisorbed oxygen of the V 2 O 5 /TiO 2 -S catalyst could be responsible for the enhancement in the activity of NH 3 -SCR reaction over the catalyst. Graphical Abstract