In order to reduce oxides of nitrogen (NOx) emanated from a diesel eng ine, a comprehensive urea selective catalyst reduction (SCR) DeNOx catalys t was modeled in which numerical simulations were used as a complementary tool f or the experimental investigations to make the design decisions, and hence short en the development process. In this approach, relevant conversion reactions were studied in 1D model, and the parameters obtained in this way were transferred t o 3D simulations. According to the results of the study, the conversion of NO an d NO2 increased with the increase in monolith solid temperature. With the incr ease in the ratio of NO2/NO, the conversion of NO, NO2 and NOx increas ed resulting in maximum reduction of NOx at the ratio of 1; beyond this ra tio, the conversion of NO2 and NOx decreased; however, NO continued to b e converted till the ratio was 1.8. The conversion of NOx decreased with the increase in space velocity.
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