关键词:

选择催化还原, 丙烯, 一维非均相模型, 扩散

Abstract: The reaction of selective catalytic reduction (SCR) of nitrogen oxide (NO) in lean-burning engine exhaust with propylene was studied on Pt/γ-Al₂O₃ 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 theory. 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 higher concentration C₃H₆ 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 C₃H₆ the internal diffusion becomes serious.

Key words:

选择催化还原, 丙烯, 一维非均相模型, 扩散