Patent ID: 7520126
Filing Date: 2009-04-21
Classification: B01D,F01N,F02B,F02D,F02M,Y02A

Abstract:
1. An exhaust purification method of an internal combustion engine wherein combustion gas or burned gas in an engine combustion chamber or an exhaust gas exhausted from the engine combustion chamber is brought into contact with a NO x storing and decomposing catalyst, nitrogen oxide contained in these gases is adsorbed at the NO x storing and decomposing catalyst and disassociated to nitrogen and oxygen when burning fuel under a lean air-fuel ratio, the disassociated oxygen is held on the NO x storing and decomposing catalyst at this time, the disassociated nitrogen is separated from the NO x storing and decomposing catalyst, an energy necessary for purging part of the oxygen held on the NO x storing and decomposing catalyst from the NO x storing and decomposing catalyst is imparted to the NO x storing and decomposing catalyst to purge part of the oxygen held on the NO x storing and decomposing catalyst from the NO x storing and decomposing catalyst, and this purging action induces the remaining oxygen held on the NO x storing and decomposing catalyst to be purged from the NO x storing and decomposing catalyst, wherein oxygen defects formed in the carrier of the NO