Improvement of Prediction Accuracy of SCR Catalyst Model under High Temperature Condition (First Report)

- Identification Issues and Modeling -

Abstract

In recent years, exhaust purification performance under high temperature became more important for commercial vehicle due to the regulation of off-cycle emission and introduction of close-coupled after-treatment system. In this report, we clarified the problem of prediction accuracy of NOx conversion performance under high temperature in conventional Cu-SCR model proposed in previous reports. To improve prediction accuracy of NOx conversion performance under high temperature, we found NOx concentration dependent NH₃ oxidations are the key reactions. Improved Cu-SCR model showed good correlation to experimental results of reactor in the range of 150-600 °C.