EXHAUST PURIFICATION DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

An engine wherein a plurality of NOx storing catalysts (11, 12) are arranged in parallel in an engine exhaust passage, reducing agent feed valves (14, 15) for supplying reducing agent to the NOx storing catalysts (11, 12) are individually provided for the NOx storing catalysts (11, 12), and, when NOx should be released from the NOx storing catalysts (11, 12), the upstream-most NOx storing catalyst (11) is fed with the reducing agent required for consuming the oxygen contained in the exhaust gas in addition to the reducing agent required for reducing the NOx stored in the upstream-most NOx storing catalyst (11) from the first reducing agent feed valve (14).