Abstract
In this study we designed a lean <TEX>$NO_x$</TEX> trap (LNT) model with <TEX>$GT-POWER^{TM}$</TEX> 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, <TEX>$NO_x$</TEX> adsorption, <TEX>$NO_x$</TEX> 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 <TEX>$200^{\circ}C{\sim}500^{\circ}C$</TEX> with the even spaced temperature step of <TEX>$50^{\circ}C$</TEX>. The experimental results show that the <TEX>$NO_x$</TEX> conversion efficiency was enhanced by the temperature up to <TEX>$350^{\circ}C$</TEX> and then decayed at higher temperatures. The LNT model predicts the similar trend of the <TEX>$NO_x$</TEX> conversion efficiency to the experimental results below <TEX>$350^{\circ}C$</TEX>, but overestimates above <TEX>$350^{\circ}C$</TEX>. This overestimation comes from the higher reduction efficiency which was obtained by the different reduction gas composition such as <TEX>$C_3H_6$</TEX> in the model to replace <TEX>$CH_4$</TEX>, <TEX>$C_2H_4$</TEX> in the bench test.
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