EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE

Title:

EXHAUST GAS PURIFIER FOR INTERNAL COMBUSTION ENGINE

Document Type and Number:

WIPO Patent Application WO/2007/064004

Kind Code:

A1

Abstract:

This invention provides an exhaust gas purifier for an internal combustion engine comprising exhaust gas purification means such as an NOx catalyst (20) provided in an exhaust passage (15) in an internal combustion engine, and an SOx trapping catalyst (30) provided upstream of the exhaust gas purification means, and ozone supply means (40, 41) which can supply ozone to a position upstream of the SOx trapping catalyst (30). According to the above constitution, SOx in the exhaust gas can be absorbed in the SOx trapping catalyst (30) before arrival at the NOx catalyst (20). In particular, SOx in the exhaust gas can be oxidized with ozone as an oxidizing gas to a decomposable state, and SOx can be absorbed even at a low temperature. Preferably, the SOx trapping catalyst (30) does not have an active site of a noble metal. In this case, sulfur poisoning of the SOx trapping catalyst can be prevented, and a lowering of the SOx absorption capacity can be suppressed.

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Inventors:

HIRATA HIROHITO (JP)
KAKINOHANA MASARU (JP)
IBE MASAYA (JP)

Application Number:

PCT/JP2006/324133

Publication Date:

June 07, 2007

Filing Date:

November 28, 2006

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
HIRATA HIROHITO (JP)
KAKINOHANA MASARU (JP)
IBE MASAYA (JP)

International Classes:

F01N3/08; B01D53/86; B01D53/94; F01N3/10; F01N3/28

Domestic Patent References:

WO1999036162A1	1999-07-22
WO2004024301A1	2004-03-25

Foreign References:

JP2005535438A	2005-11-24
JP2003516491A	2003-05-13
JP2000145436A	2000-05-26

Other References: