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http://dx.doi.org/10.7467/KSAE.2013.21.6.064

A Performance Modeling of the Lean NOx Trap Catalyst with GT-POWERTM  

Kim, Hyunjun (Graduate School of Mechanical and Automotive Engineering, Keimyung University)
Han, Manbae (Department of Mechanical and Automotive Engineering, Keimyung University)
Jeon, Ji-Yong (R&D Center, E&D Corporate Ltd.)
Kim, Tae-Min (R&D Center, E&D Corporate Ltd.)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.21, no.6, 2013 , pp. 64-71 More about this Journal
Abstract
In this study we designed a lean $NO_x$ trap (LNT) model with $GT-POWER^{TM}$ program and then the LNT model was compared to the bench flow reactor test results. This model consists of 9 kinetic reactions to represent the main steps of NO oxidation, $NO_x$ adsorption, $NO_x$ release and then its reduction. The comparison was performed on the operating conditions at the space velocity of 50,000 1/hr and 80,000 1/hr with the temperature range of $200^{\circ}C{\sim}500^{\circ}C$ with the even spaced temperature step of $50^{\circ}C$. The experimental results show that the $NO_x$ conversion efficiency was enhanced by the temperature up to $350^{\circ}C$ and then decayed at higher temperatures. The LNT model predicts the similar trend of the $NO_x$ conversion efficiency to the experimental results below $350^{\circ}C$, but overestimates above $350^{\circ}C$. This overestimation comes from the higher reduction efficiency which was obtained by the different reduction gas composition such as $C_3H_6$ in the model to replace $CH_4$, $C_2H_4$ in the bench test.
Keywords
Lean $NO_x$ trap; $NO_x$ conversion efficiency; $NO_x$ storage efficiency; $NO_x$ reduction efficiency;
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