Exhaust gas purifier

a technology of exhaust gas purifier and purification apparatus, which is applied in the direction of physical/chemical process catalyst, metal/metal-oxide/metal-hydroxide catalyst, separation process, etc., can solve the problems of difficult suppression of harmful substances, deterioration of fuel efficiency, and unsatisfactory purification of exhaust gas, etc., to achieve superior oxidation performance, superior oxidation activity, and low cost
US20160367943A1Active Publication Date: 2016-12-22N E CHEMCAT
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
N E CHEMCAT
Publication Date
2016-12-22

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Abstract

An exhaust gas purification catalyst apparatus, which is superior in oxidation performance of, in particular, nitrogen monoxide, among hydrocarbons, carbon monoxide, nitrogen oxides and particulate components such as soot, included in exhaust gas from a lean burn engine, and combustion performance of light oil. The exhaust gas purification apparatus arranged with an oxidation catalyst (DOC) comprising a noble metal component for oxidizing carbon monoxide, hydrocarbons, in particular, nitrogen monoxide among nitrogen oxides, and for combusting light oil, a catalyzed soot filter (CSF) including a noble metal component for collecting a particulate component such as soot and removing by combustion (oxidation). The oxidation catalyst (DOC) has a catalyst layer where platinum (Pt), palladium (Pd) and barium oxide (BaO) are supported on alumina (Al2O3) having a pore size of 12 to 120 nm, and ratio of platinum and palladium is 1:1 to 11:2 in weight equivalent.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This is a divisional of U.S. application Ser. No. 14 / 396,234 filed on Oct. 22, 2014, which is a 371 of PCT / JP2013 / 060669 filed on Apr. 9, 2013, which claims priority to Japanese Application No. 2012-110519 filed May 14, 2012, the entire contents of which is incorporated herein by reference.TECHNICAL FIELD

[0002] The present invention relates to an exhaust gas purification apparatus, and in more detail, the present invention relates to an exhaust gas purification catalyst apparatus combined an diesel oxidation catalyst (DOC) and a catalyzed soot filter (CSF), which are superior in oxidation performance of, in particular, nitrogen monoxide (NO), among hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and particulate components such as soot, included in exhaust gas from a lean burn engine, and combustion performance of unburned fuel such as light oil.BACKGROUND ART

[0003] In exhaust gas discharged from a lean burn engine such as a b...

Claims

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