SELECTIVE CATALYTIC REDUCTION OF NITROGEN OXIDE BY PROPYLENE
The reaction of selective catalytic reduction (SCR) of nit ro gen oxide (NO) in lean-burning engine exhaust with propylene was studied on Pt/ γ-Al_2O_3 supported by monolith honeycomb. A one-dimensional heterogeneous model was set up to simulate the process behavior of reactions, and the effects of factors, such as reaction temperature, reactant concentration, dimension of channel of monolith catalyst, were discussed in detail both by experiment and th eory. The results predicted by the model were tested through experiments. With this model, the effects of inter- and intra-phase diffusion and other factors are discussed. The model shows that the NO conversion rate will rise when high er concentration C_3H_6 is used; the influence of hydraulic diameter is small; the reaction is controlled by the kinetics under low temperature and after the light off of C_3H_6 the internal diffusion becomes serious.