Characterization of MoO3–V2O5/Al2O3 catalysts for selective catalytic reduction of NO by NH3

MoO3–V2O5/Al2O3 catalysts were characterized by B.E.T., XRD, LRS, XPS and TPR and the effect of MoO3 addition to alumina supported vanadia catalysts on the catalytic activity for the selective catalytic reduction of NO by ammonia was investigated. Upon the addition of MoO3, catalytic activity was enhanced and the particle size of V2O5 which is shown by the results of B.E.T., XRD and Raman spectroscopy decreased. This was one reason for increased catalytic activity. The results obtained by XPS and TPR showed that MoO3 addition to alumina supported vanadia catalysts increased the reducibility of vanadia and this was the another reason for synergy effect between MoO3 and V2O5 in MoO3–V2O5/Al2O3 catalysts.