| 초록 |
Three-way catalysts (TWC) have been employed for converting CO, HCs and NOx simultaneously, however, the emission of byproducts such as poisonous and corrosive ammonia (NH3) and the greenhouse gas, nitrous oxide (N2O) is one of the major concerns in aftertreatment system. Moreover, the feed composition (i.e., A/F ratio and reductant species) is the key parameter affecting the TWC performance as well as the byproducts formation. To minimize the NH3 and N2O emissions via NO reduction, it is highly desirable to identify the impact of feed composition and its reaction pathway for the NO reduction to the formation of NH3 and N2O. In the present study, simple and full mixture feed tests have been systematically performed over the commercial aged Pd/Rh TWCs. The simple feed test has been conducted under the condition containing single reductant (CO, H2 or HCs: C3H6/C3H8) or NO together with 10% H2O as a function of A/F ratio, where full mixture contains all reactants mentioned. This study will provide an optimal feed condition for minimized NH3 and N2O emissions as well as a role of each reactants, CO, H2 and HCs in TWC reactions. |
