SELECTIVE CATALYTIC REDUCTION OF NITROGEN-OXIDES WITH AMMONIA ON V2O5TIO2 CATALYST/

An evaluative method was elaborated for the kinetics description of th e selective catalytic reduction (SCR) of nitrogen oxides, being presen t in the exhaust gases of stationary sources. The volumetric ratio of NO and NO2 was roughly one in the simulated flue gases. Data on the de nox reaction of this type of exhaust gases can hardly be found in lite rature. It was proved that the reduction rate can be fairly well descr ibed with the help of a power rate type kinetic equation. The kinetic data of NO-NO2-NH3 reaction on V2O5/TiO2 catalyst show that the reacti on rate depends linearly on the NOx concentration (order = 1.07), to a smaller extent on the ammonia concentration (order = 0.73), and it is practically independent of the oxygen concentration. The used catalys t particles of 3 mm characteristic size show a considerable intraparti cle diffusion hindrance, it has not an influence on the total reaction order.