Method for operating an exhaust gas purification device comprising an SCR catalytic converter and an exhaust gas purification component with oxidation catalytic action mounted upstream thereof

摘要

The method involves determining an aging condition of an oxidation-catalytically effective exhaust gas cleaning component e.g. oxidation catalyzer (3), by correlation of hydrocarbon existed in an exhaust gas upstream of the component with a nitrogen oxide conversion of a selective catalytic reduction (SCR) catalyzer (5) e.g. nitrogen oxide reductions catalyzer. Different hydrocarbon portions in the exhaust gas are adjusted in an operating point with temperature of the component and temperature of the SCR catalyzer in a range between 180 degree Celsius and 350 degree Celsius.