Synthesis and characterization of V2O5 supported on TiO2 selective catalytic reduction (SCR) catalyst for De-NOX

Abstract

The most efficient after-treatment technology for reducing harmful NO_x emissions from mobile and stationary sources of Power plants is the selective catalytic reduction (SCR) of NO_x with ammonia (NH₃). V₂O₅-WO₃based SCR catalysts reduce NO_x selectively between ca. 200 and 500°C. Pure and (NH₄VO₃:WO₃:TiO₂) vanadium (V⁵⁺) and WO₃ doped TiO₂ have been synthesized by Sol-gel method, using different sources of carrier materials. Synthesized materials have been characterized by Brunauer-Emmett-Teller (BET) and De-NO_x techniques. Specific surface area and the mean pore diameter of the catalysts were determined by BET. BET study shows the catalyst prepared by TiO₂/ V₂O₅-WO₃ from titanium oxy sulphate with 87:10:03 ratio of TiO₂:Tungsten:Vanadia has highest surface area of 150.32m²/g. Percentage of NO_X conversion is found out by De-NOx test. Highest NO_x conversion was observed for catalyst prepared by titanium, NO_x conversion reduces with increase in calcination time and increases with decrease in space velocity. At 2000hr^-1 space velocity the catalyst synthesized from titanium oxysulphate with 85:10:05 ratio of TiO₂:Tungsten:Vanadia gives highest NO_x conversion of 36.74% at 440^oC & TiO₂ in 2-Propanol with 87:10:03 ratio of TiO₂:Tungsten:Vanadia gives highest NO_x conversion of 25.8% at 325^oC.