DeNOx 효율 증진을 위한 LNT 촉매 최적화

LNT has been considered as one of NOx reduction technologies for EURO6 regulations and is required to be optimized for the diesel passenger cars of which the exhaust gas temperature is expected to be lower than those of cars complying with the previous regulations. There are two major factors to be considered, increasing the NO conversion to NO2, which is likely to be stored on the storage site, at the temperature region as low as possible and trapping ability to the formed NO2 under the specific exhaust gas condition. And the desulfation characteristics is the another aspect of LNT to be addressed because of the fuel penalty resulting from the extra fuel consumption that is necessary to generate the fuel-rich high temperature environment. In this study, an optimization has been carried out to develop LNT catalyst for EURO-6 regulations in terms of PM-NSC interaction, NSC amount. Combining the optimization with the application of new NSC showed a significant improvement in the LNT performance such as NOx conversion, NOx storage capacity and desulfation characteristics.