Korrelation zwischen Umsatzverhalten und katalytischer Oberfläche von Dieseloxidationskatalysatoren unter Variation von Beladung und Alterungszustand

It is investigated if the kinetics of catalysts is describable by the same rate equations if only the rate constant of the reaction steps is scaled by the catalytically active surface. A microkinetik model is applied for simulation of Pt/Al2O3 catalysts with different Pt loading and aging state in exhaust-gas experiments. It is shown that the approach is suitable for CO and propene oxidation. However, the correlation for NO oxidation is displaced by the formation of platinum oxide.