Abstract
NO x adsorption was measured with a barium based NO x storage catalyst at an engine bench equipped with a lean burn gasoline direct injection engine (GDI). In order to study the influence of gas phase NO2 on the NO x storage efficiency two different precatalysts were used: One with excellent NO oxidation activity to produce a high NO2 concentration and another pre-catalyst without NO oxidation activity and therefore high NO concentration at the NO x storage catalyst inlet. Both pre-catalyst had excellent HC and CO conversion efficiency and therefore the CO and HC concentration at the NO x storage catalyst inlet was practically zero. No lean NO x reduction was observed. Under that conditions, experiments with NO x storage catalysts of different length show that a high NO2 inlet concentration did not enhance the NO x storage efficiency. Moreover, we observed reduction of NO2 to NO over the NO x storage catalyst. However, in presence of a high NO inlet concentration NO2 formation was observed which may proceed parallel to NO x storage.
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