Transient behaviour of catalytic monolith with NOx storage capacity

摘要: Abstract Transient behaviour of catalytic monolith converter with NOx storage is studied under conditions typical for automobiles lean-burn engines (i.e., diesel and advanced gasoline ones). Periodical alternation inlet concentrations applied—NOx are adsorbed on the catalyst surface during a long reductant-lean phase (2–3 min) then reduced to N2 within short reductant-rich (2–6 s). Samples industrial reduction NM/Ba/CeO2/γ-Al2O3 type (NM = noble metal), washcoated 400 cpsi cordierite substrate, used in study. Effects rich-phase length composition overall conversions examined experimentally. Reduction by CO, H2 unburned hydrocarbons (represented C3H6) presence CO2 H2O considered. Effective, spatially 1D, heterogeneous mathematical model oxygen capacity described. The minimum set experiments needed evaluation relevant reaction kinetic parameters discussed: (i) HC oxidation light-off both lean rich conditions, including inhibition effects, (ii) NO/NO2 transformation, (iii) storage, temperature dependence effective capacity, (iv) water gas shift steam reforming i.e., situ production hydrogen, (v) reduction, (vi) desorption conditions. experimental data compared simulation results.