Apparatus for purifying exhaust gas of internal combustion engine

Abstract

The invention provides an exhaust gas purifying apparatus comprising a NOx storage reduction catalyst and a particulate filter, wherein the original NOx storage ability of the NOx storage reduction catalyst is sufficiently utilized. Specifically, the exhaust gas purifying apparatus comprises a filter (40) arranged in the upstream of a NOx storage reduction catalyst (22), a fuel supply means (42) for supplying a fuel so that the fuel is mixed with the exhaust gas flowing into the filter (40), and an ozone supply means (30) for supplying ozone in the downstream of the filter (40) so that ozone is mixed with the exhaust gas flowing into the NOx storage reduction catalyst (22).

Description

technical field [0001] The invention relates to an exhaust gas purification device for an internal combustion engine, in particular to a device with NO x Exhaust gas purification with storage reduction catalyst and particle filter. Background technique [0002] Conventionally, for example, as disclosed in the following patent documents, in an internal combustion engine, particularly a diesel engine, it is known that a filter, a NO x An exhaust gas purification device that stores a reduced catalyst (hereinafter referred to as an NSR catalyst). With this device, it is possible to use a filter to capture particulates contained in exhaust gas, and to use an NSR catalyst to capture NO, which becomes insufficient to purify under a lean atmosphere. x . [0003] In the exhaust gas purification device described above, in order to prevent an increase in exhaust resistance due to clogging of the filter, it is necessary to perform a process of removing captured particles from the fil...

AI Technical Summary

Problems solved by technology

However, in conventional exhaust gas purification devices, the NO x The occlusion capacity is not fully utilized

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