FT-IR Emission Spectroscopic Studies of Surface Structure of V2O5/TiO2 Catalyst

FT-IR emission spectroscopy has been used to study the surface structure V2O5/TiO2 catalyst with V2O5 loadings of 0.4%, 2% and 10% wt. prepared by of TiO2 in NH4VO3 solution. The IR emission spectra were recorded insitu the course of a calcination of the impregnated catalyst from 100 degrees C to 500 degrees C. ammonium vanadate supported on TiO2 was found to be decomposition more easily pure NH4VO3 most possibly owing to the chemical interaction between vanadate 1102. For 10% wt. V2O5/TiO2 catalyst the IR peaks due to V2O5 phase appeared catalyst was calcined at 200-400 degrees C. when the catalyst was calcined at 500 degrees C of V2O5 phase were evidently reduced indicating that the part of V2O5 phase spreaded into highly dispersed vanadium oxide on TiO2. For the catalysts with - loading of vanadium,the IR peaks due to V2O5 phase decreased and a broad peak from 1050cm(-1) to 900cm(-1) became prominent especially after a calcination at 500 The broad peak was tentatively assigned to the highly dispersed VOx species which - be the two-dimensional vanadium oxide. This study also demonstrated that FT-IR spectroscopy is a very sensitive technique for investigating the surface structure oxide catalyst.