THERMAL DEACTIVATION OF V2O5 TIO2 CATALYST USED IN SELECTIVE CATALYTIC REDUCTION OF NOX/

Thermal deactivation and structural specificity of V2O5/TiO2 catalyst were investigated in the selective catalytic reduction of nitric oxide s. Catalysts were characterised by BET specific surface area technique , mercury penetration porosimetry, X-ray diffraction and scanning elec tron microscopy. A steady state fixed bed reactor with the appropriate measurement system was used for the activity tests of original and th ermally deactivated catalyst samples. The 72 hour heat treatment at th e temperature of 420 and 480 degrees C has not significant effect on t he bulk density, density, pore volume and phase composition of catalys t. The surface area of samples decreased characteristically. The relat ion of reaction rate preexponent constant to the specific surface area can be used as a measure of deactivation.