EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE DYNAMICS OF THE SCR- DENOX REACTION

The kinetics of NH3 -adsorption -desorption over model V2O5-(WO3)/TiO2 catalysts for the Selective Catalytic Reduction of NOx has been studi ed by transient response techniques, and described according to rate e xpressions which account for heterogeneity of the catalyst surface. A dynamic mathematical model of the industrial SCR monolith reactor has been derived, using the results of the transient study of NH3 adsorpti on as well as other independently estimated parameters. It has been su ccessfully validated against laboratory data concerning unsteady opera tion of commercial SCR honeycomb catalysts, and applied to the simulat ion of typical transients of industrial SCR reactors. It is shown that the variations of the NOx emissions are always much faster than the d ynamics of NH3.