The role of reaction kinetics and mass transfer in the selective catalytic reduction of NO with NH₃ in monolithic reactors

Selective catalytic reduction of NO in a reverse-flow reactor: Modelling and experimental validation

“…As shown, NO concentration decreases sharply, as determined by the reaction kinetics and the concentration of NH 3 adsorbed in the catalyst. This last factor is very important for the reactor performance, as demonstrated previously in this work and elsewhere [9]. In this case, the maximum concentration of adsorbed NH 3 is relatively low (around 20%), and it is obtained at the entrance of the reactor, when NO concentration and hence reaction rate are high.…”

“…This parameter was calculated from experiments carried out with the monolith and correlated with temperature according to g int = exp(8304/T À 19.6), as discussed in [9].…”

“…The kinetic parameters appearing in Table 2 have been determined by fitting experimental data obtained in the absence of diffusional limitations (e.g. using a small amount of ground monolith), as explained elsewhere [9]. The total NH 3 adsorption capacity of the catalyst was measured in 0.113 mol NH 3 /kg cat .…”

“…So reaction (1) or standard SCR, is the most important, and in many simplified studies is the only considered. The third reaction, or ''fast-SCR'', is relevant only at low temperature [9,10].…”