Basic reaction model of after-treatment of automobile exhaust gas over the three-way catalyst
The after-treatment of automobile exhaust gas over the three-way catalyst is a complex reaction system. In order to estimate the behavior of the catalytic converter, a dynamic model is desired. In this study, a steady-state reaction model, which is comprehensive and simple enough to be a base of the dynamic model, was proposed. For attaining a short residence time, a small reactor having the 1 mm pitch 2-73 mm long honeycomb catalyst cut out of a commercial catalyst with Pt and Rh supported alumina washcoated was employed. To formulate the reaction rate, the subsets of reactions such as NO reduction by CO or C3H6 were carried out at 140-340 ℃. In NO reduction, dissociation of NO is rate-determining as well as adsorbed oxygen is involved in the reaction mechanism. The ratio of N2O production to N2 production rates was proportional to the NO pressure, indicating they are formed in different paths. Each of the rate constants and the equilibrium constants were determined. After-treatment reaction experiments of a simulated exhaust gas were also Carried out. The results calculated with the proposed model well accounted for the experimental results.
reaction model after-treatment automobile exhaust three-way catalyst
Motoaki KAWASE Hitoshi NAKANISHI Tatsuya YOSHIKAWA Kouichi MIURA
Department of Chemical Engineering, Kyoto University, Katsura, Kyoto 615-8510,Japan ICT Co., Ltd., 992-1 Nishioki, Okihama, Aboshi-Ku, Himeji 671-1292 Japan
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）