EXHAUST PURIFYING DEVICE OF INTERNAL COMBUSTION ENGINE
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United States of America Patent
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Issued Date -
Apr 7, 2011
app pub date -
Nov 6, 2008
filing date -
Nov 7, 2007
priority date (Note) -
Abandoned
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Abstract
An upstream catalyst and a downstream catalyst are arranged in series and are housed in a common casing disposed in an engine exhaust passage. The upstream catalyst including a NOx storage-reduction catalyst that adsorbs NOx contained in incoming exhaust gas when the air-fuel ratio of the incoming exhaust gas is lean, and releases and reduces the adsorbed NOx when the air-fuel ratio of the incoming exhaust gas becomes rich, and the downstream catalyst includes a three-way catalyst. The upstream catalyst has a higher oxidizing capability than the downstream catalyst, and the downstream catalyst has a higher reducing capability than the upstream catalyst. The upstream catalyst has a multi-layer structure including an upper layer and a lower layer, and is prepared such that the upper layer has a higher oxidizing capability than the lower layer, and the lower layer has a higher reducing capability than the upper layer.
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