JP2018021564A5 - - Google Patents
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- JP2018021564A5 JP2018021564A5 JP2017207375A JP2017207375A JP2018021564A5 JP 2018021564 A5 JP2018021564 A5 JP 2018021564A5 JP 2017207375 A JP2017207375 A JP 2017207375A JP 2017207375 A JP2017207375 A JP 2017207375A JP 2018021564 A5 JP2018021564 A5 JP 2018021564A5
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- JP
- Japan
- Prior art keywords
- nox
- catalyst layer
- catalyst
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003054 catalyst Substances 0.000 claims description 50
- 229910002089 NOx Inorganic materials 0.000 claims description 33
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 239000000969 carrier Substances 0.000 claims description 9
- 238000000746 purification Methods 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 5
- 150000001340 alkali metals Chemical class 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 5
- 229910052723 transition metal Inorganic materials 0.000 claims description 5
- 150000003624 transition metals Chemical class 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium(0) Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052703 rhodium Inorganic materials 0.000 claims description 2
- 239000010948 rhodium Substances 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 239000010970 precious metal Substances 0.000 claims 1
- 210000003660 Reticulum Anatomy 0.000 description 4
- 230000000274 adsorptive Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
Description
上記の目的を達成するために、請求項１の内燃機関の排気浄化装置では、内燃機関の排気通路に設けられた内燃機関の排気浄化装置であって、空燃比がストイキよりもリーンなリーン雰囲気下でＮＯｘをトラップするアルカリ金属またはアルカリ土類金属が担持されたＮＯｘトラップ触媒層とリーン雰囲気下でＮＯｘを吸着する遷移金属が担持されたＮＯｘ吸着触媒層とが一の触媒担体に設けられた第１の触媒と、前記排気通路における前記第１の触媒よりも排気流れ方向の下流側に設けられ、ＮＯｘの還元性能を有する第２の触媒とを備え、前記ＮＯｘトラップ触媒層が前記触媒担体における排気流れ方向の上流側に設けられ、かつ、前記ＮＯｘ吸着触媒層が前記触媒担体における下流側に設けられており、前記触媒担体において前記ＮＯｘトラップ触媒層にのみ酸化性能を有する貴金属が更に担持されたことを特徴とする。 In order to achieve the above object, the exhaust gas purification apparatus for an internal combustion engine according to claim 1 is an exhaust gas purification apparatus for an internal combustion engine provided in an exhaust passage of the internal combustion engine, wherein the air-fuel ratio is leaner than the stoichiometric. An NOx trap catalyst layer supporting an alkali metal or alkaline earth metal that traps NOx below and a NOx adsorption catalyst layer supporting a transition metal that adsorbs NOx under a lean atmosphere are provided on one catalyst carrier. A first catalyst, and a second catalyst provided in the exhaust passage in the exhaust flow direction downstream of the first catalyst and having NOx reduction performance, wherein the NOx trap catalyst layer is the catalyst carrier. The NOx adsorption catalyst layer is provided on the downstream side of the catalyst carrier, and the NOx adsorption catalyst layer is provided on the catalyst carrier. Wherein the noble metal is further supported with only oxidation performance trap catalyst layer.
また、請求項２の内燃機関の排気浄化装置では、請求項１において、前記ＮＯｘトラップ触媒層に前記アルカリ金属またはアルカリ土類金属としてバリウムが担持され、前記ＮＯｘ吸着触媒層に前記遷移金属として銀が担持され、前記ＮＯｘトラップ触媒層に前記貴金属としてプラチナ、パラジウム、ロジウムの全てが担持されたことを特徴とする。
また、請求項３の内燃機関の排気浄化装置では、請求項１または２において、前記排気通路には前記内燃機関に吸入される新気を圧縮するターボチャージャが設けられており、前記第１の触媒が前記排気通路における前記ターボチャージャの直下に設けられることを特徴とする。
Further, in the exhaust gas purification apparatus for an internal combustion engine according to claim 2, in claim 1, barium is supported as the alkali metal or alkaline earth metal on the NOx trap catalyst layer, and silver as the transition metal is supported on the NOx adsorption catalyst layer. Is supported, and platinum, palladium, and rhodium are all supported as the noble metal on the NOx trap catalyst layer .
According to a third aspect of the present invention, there is provided an exhaust gas purification apparatus for an internal combustion engine according to the first or second aspect, wherein the exhaust passage is provided with a turbocharger for compressing fresh air drawn into the internal combustion engine. A catalyst is provided immediately below the turbocharger in the exhaust passage .
本発明によれば、アルカリ金属またはアルカリ土類金属が担持されたＮＯｘトラップ触媒層を上流側、ＮＯｘを吸着する遷移金属が担持されたＮＯｘ吸着触媒層を下流側に配置することにより、リーン雰囲気下における高温時と低温時の双方において効果的にＮＯｘをトラップまたは吸着するようにできるとともに、ＮＯｘパージ時には、第１の触媒より放出されたＮＯｘを第２の触媒確実に還元浄化することができる。したがって、簡易な構造で排気を浄化することができる。 According to the present invention, the NOx trap catalyst layer loaded with alkali metal or alkaline earth metal is disposed upstream, and the NOx adsorption catalyst layer loaded with transition metal that adsorbs NOx is disposed downstream, thereby providing a lean atmosphere. The NOx can be effectively trapped or adsorbed at both high temperature and low temperature below, and NOx released from the first catalyst can be reliably reduced and purified by the second catalyst during the NOx purge. . Therefore, exhaust gas can be purified with a simple structure.
上流側触媒６には、筒状のケーシング６ａ内に排気が通過する通路６ｂの両端が開放したハニカム担体、所謂オープンフローハニカム６ｃが備えられている。通路６ｂは、多孔質、またはメタル箔の壁６ｄで形成される。そして、オープンフローハニカム６ｃの通路６ｂを形成する多孔質の壁６ｄには、排気流れ方向の上流側より順にＮＯｘトラップ触媒層６ｅと低温ＮＯｘ吸着触媒層（本発明のＮＯｘ吸着触媒層に相当）６ｆとが形成されている。 The upstream catalyst 6 is provided with a so-called open flow honeycomb 6c, which is a honeycomb carrier in which both ends of a passage 6b through which exhaust gas passes are opened in a cylindrical casing 6a. The passage 6b is formed of a porous or metal foil wall 6d. Then, the wall 6d of the porous forming a passage 6b of the open flow honeycomb 6c is composed, in order from the upstream side of the exhaust gas flow direction NOx trap catalyst layer 6 e and cold NOx adsorption catalyst layer (the N Ox adsorptive catalyst layer of the present invention Equivalent) 6f.
１ エンジン（内燃機関）
５ 排気管（排気通路）
６ 上流側触媒（第１の触媒）
６ｃ オープンフローハニカム
６ｅ ＮＯｘトラップ触媒層
６ｆ 低温ＮＯｘ吸着触媒層（ＮＯｘ吸着触媒層）
７ 下流側触媒（第２の触媒）
７ｃ ウォールフローフィルタ
７ｅ ＮＯｘ還元触媒層
７ｆ ＰＭ燃焼触媒層
1 engine (internal combustion engine)
5 Exhaust pipe (exhaust passage)
6 Upstream catalyst (first catalyst)
6c Open flow honeycomb 6e NOx trap catalyst layer 6f Low temperature NOx adsorption catalyst layer ( N Ox adsorption catalyst layer )
7 Downstream catalyst (second catalyst)
7c Wall flow filter 7e NOx reduction catalyst layer 7f PM combustion catalyst layer
Claims (3)
空燃比がストイキよりもリーンなリーン雰囲気下でＮＯｘをトラップするアルカリ金属またはアルカリ土類金属が担持されたＮＯｘトラップ触媒層とリーン雰囲気下でＮＯｘを吸着する遷移金属が担持されたＮＯｘ吸着触媒層とが一の触媒担体に設けられた第１の触媒と、前記排気通路における前記第１の触媒よりも排気流れ方向の下流側に設けられ、ＮＯｘの還元性能を有する第２の触媒とを備え、
前記ＮＯｘトラップ触媒層が前記触媒担体における排気流れ方向の上流側に設けられ、かつ、前記ＮＯｘ吸着触媒層が前記触媒担体における下流側に設けられており、
前記触媒担体において前記ＮＯｘトラップ触媒層にのみ酸化性能を有する貴金属が更に担持されたことを特徴とする内燃機関の排気浄化装置。 An exhaust purification device for an internal combustion engine provided in an exhaust passage of the internal combustion engine,
NOx trap catalyst layer supporting alkali metal or alkaline earth metal that traps NOx in a lean atmosphere where the air-fuel ratio is leaner than stoichiometric, and NOx adsorption catalyst layer supporting a transition metal that adsorbs NOx in a lean atmosphere And a first catalyst provided on one catalyst carrier, and a second catalyst provided in the exhaust passage on the downstream side of the first catalyst in the exhaust flow direction and having NOx reduction performance. ,
The NOx trap catalyst layer is provided upstream of the catalyst carrier in the exhaust flow direction, and the NOx adsorption catalyst layer is provided downstream of the catalyst carrier;
An exhaust gas purification apparatus for an internal combustion engine , wherein a precious metal having oxidation performance is further supported only on the NOx trap catalyst layer in the catalyst carrier .
前記ＮＯｘ吸着触媒層に前記遷移金属として銀が担持され、
前記ＮＯｘトラップ触媒層に前記貴金属としてプラチナ、パラジウム、ロジウムの全てが担持されたことを特徴とする請求項１に記載の内燃機関の排気浄化装置。 Barium is supported as the alkali metal or alkaline earth metal on the NOx trap catalyst layer,
Silver is supported as the transition metal on the NOx adsorption catalyst layer,
The exhaust purification apparatus for an internal combustion engine according to claim 1 , wherein platinum, palladium, and rhodium are all supported as the noble metal on the NOx trap catalyst layer .
前記第１の触媒が前記排気通路における前記ターボチャージャの直下に設けられることを特徴とする、請求項１または２に記載の内燃機関の排気浄化装置。 The exhaust passage is provided with a turbocharger that compresses fresh air sucked into the internal combustion engine,
3. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the first catalyst is provided immediately below the turbocharger in the exhaust passage .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017207375A JP6402875B2 (en) | 2017-10-26 | 2017-10-26 | Exhaust gas purification device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017207375A JP6402875B2 (en) | 2017-10-26 | 2017-10-26 | Exhaust gas purification device for internal combustion engine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2013156849A Division JP2015025433A (en) | 2013-07-29 | 2013-07-29 | Exhaust emission control device for internal combustion engine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2018021564A JP2018021564A (en) | 2018-02-08 |
| JP2018021564A5 true JP2018021564A5 (en) | 2018-03-29 |
| JP6402875B2 JP6402875B2 (en) | 2018-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017207375A Active JP6402875B2 (en) | 2017-10-26 | 2017-10-26 | Exhaust gas purification device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6402875B2 (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2658754B2 (en) * | 1992-07-30 | 1997-09-30 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP3591186B2 (en) * | 1997-01-23 | 2004-11-17 | 日産自動車株式会社 | Exhaust purification catalyst device for internal combustion engine |
| JP3821343B2 (en) * | 1998-12-10 | 2006-09-13 | トヨタ自動車株式会社 | Exhaust gas purification device |
| JP3613669B2 (en) * | 2000-01-19 | 2005-01-26 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP3733834B2 (en) * | 2000-05-02 | 2006-01-11 | 日産自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP4178858B2 (en) * | 2002-07-15 | 2008-11-12 | 日産自動車株式会社 | Engine exhaust purification system |
| JP2004052680A (en) * | 2002-07-22 | 2004-02-19 | Denso Corp | Exhaust emission control device |
| JP3852466B2 (en) * | 2004-11-30 | 2006-11-29 | いすゞ自動車株式会社 | NOx purification system |
| JP2007002734A (en) * | 2005-06-23 | 2007-01-11 | Mitsubishi Motors Corp | Exhaust emission control device for internal combustion engine |
| JP2010053712A (en) * | 2008-08-26 | 2010-03-11 | Toyota Motor Corp | Exhaust emission control device of internal combustion engine |
| JP2011231755A (en) * | 2010-04-30 | 2011-11-17 | Toyota Motor Corp | Exhaust emission control device of internal combustion engine |
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2017
- 2017-10-26 JP JP2017207375A patent/JP6402875B2/en active Active
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