JP2009160548A - NOx吸着装置 - Google Patents
NOx吸着装置 Download PDFInfo
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- JP2009160548A JP2009160548A JP2008002078A JP2008002078A JP2009160548A JP 2009160548 A JP2009160548 A JP 2009160548A JP 2008002078 A JP2008002078 A JP 2008002078A JP 2008002078 A JP2008002078 A JP 2008002078A JP 2009160548 A JP2009160548 A JP 2009160548A
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- 239000003054 catalyst Substances 0.000 claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 35
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 16
- 239000003463 adsorbent Substances 0.000 claims description 102
- 238000001179 sorption measurement Methods 0.000 claims description 77
- 239000000758 substrate Substances 0.000 claims description 30
- 238000003795 desorption Methods 0.000 claims description 15
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 14
- 239000010457 zeolite Substances 0.000 claims description 14
- 229910021536 Zeolite Inorganic materials 0.000 claims description 13
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 8
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 8
- 238000000746 purification Methods 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 57
- 230000000052 comparative effect Effects 0.000 description 25
- 238000003860 storage Methods 0.000 description 11
- 239000002002 slurry Substances 0.000 description 10
- 230000004913 activation Effects 0.000 description 7
- 239000002585 base Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 229910000510 noble metal Inorganic materials 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
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- 229910052802 copper Inorganic materials 0.000 description 3
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- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000011232 storage material Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 241001228709 Suruga Species 0.000 description 2
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- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
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- 238000010306 acid treatment Methods 0.000 description 1
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- 238000009835 boiling Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
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- 150000002500 ions Chemical group 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052680 mordenite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- -1 silicalite Chemical compound 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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Abstract
【解決手段】吸着したNOx の脱離量が最大となるピーク温度が 200℃以下の第1NOx 吸着材20を排ガス上流側に配置し、吸着したNOx の脱離量が最大となるピーク温度が 200℃を超える第2NOx 吸着材21を第1NOx 吸着材20の排ガス下流側に配置した。
低温域ではNOx は第1NOx 吸着材20に吸着され、高温域で第1NOx 吸着材20から脱離したNOx は第2NOx 吸着材21に再び吸着される。
【選択図】 図1
Description
図1に本実施例に係るNOx 吸着装置を示す。このNOx 吸着装置は、コージェライト製のハニカム基材1と、ハニカム基材1のセル隔壁10の表面にコートされたNOx 吸着材2と、からなる。NOx 吸着材2は、排ガス上流側で全長の1/3の範囲に第1NOx 吸着材層20が形成され、第1NOx 吸着材層20の排ガス下流側に第2NOx 吸着材層21が形成されている。以下、NOx 吸着材2の製造方法を説明し、構成の詳細な説明に代える。
実施例1と同様のハニカム基材1を用意し、上記スラリー(A)を全長にウォッシュコートし、乾燥、焼成して、全長にFe/ZSM-5からなる第1NOx 吸着材層20を形成した。第1NOx 吸着材層20は、ハニカム基材1の1リットルあたり 150g形成された。
実施例1と同様のハニカム基材1を用意し、上記スラリー(B)を全長にウォッシュコートし、乾燥、焼成して、全長にCeO2からなる第2NOx 吸着材層21を形成した。第2NOx 吸着材層21は、ハニカム基材1の1リットルあたり 150g形成された。
実施例1と同様のハニカム基材1を用意し、排ガス流入側端面から全長の1/3の範囲に上記スラリー(B)をウォッシュコートして第2NOx 吸着材層21を形成し、排ガス流出側端面から全長の2/3の範囲にスラリー(A)をウォッシュコートして第2NOx 吸着材層21を形成した。上流側の第2NOx 吸着材層21及び下流側の第1NOx 吸着材層20は、ハニカム基材1の1リットルあたりそれぞれ 150g形成された。
比較例1及び比較例2の各NOx 吸着装置を評価装置にそれぞれ配置し、表1に示すリーンガスを用いて所定温度にてNOx を飽和するまで吸着させた。NOx 吸着後の各NOx 吸着装置を評価装置にそれぞれ配置し、10℃/分の速度で室温から 550℃まで昇温したときに脱離するNOx 量をそれぞれ測定した。結果を図2に示す。
実施例1及び比較例1〜3の各NOx 吸着装置を評価装置にそれぞれ配置し、表1に示したリーンガスを10L/分の流量で流しながら、15℃/分の速度で室温から 300℃まで昇温した。その時にNOx 吸着装置から排出されたガス中のNOx 濃度を連続的に測定し、結果を図3に示す。
実施例1と同様のスラリー(A)とスラリー(B)を用い、第1NOx 吸着材層20の形成範囲を、ハニカム基材1の排ガス流入側端面から全長の0、1/30、1/15、1/10、1/5、1/3、2/5、1/2、3/5、1/1の10水準の範囲とし、残りの範囲に第2NOx 吸着材層21を形成した。第1NOx 吸着材層20が0(ゼロ)のものは比較例2のNOx 吸着装置に相当し、1/3のものは実施例1のNOx 吸着装置に相当し、1/1のものは比較例1に相当する。第1NOx 吸着材層20及び第2NOx 吸着材層21は、ハニカム基材1の1リットルあたりそれぞれ 150g形成された。
実施例1と同様に、排ガス流入側端面から全長の1/3の範囲に第1NOx 吸着材層20を形成し、排ガス流出側端面から全長の2/3の範囲に第2NOx 吸着材層21を形成したNOx 吸着装置において、第1NOx 吸着材層20はハニカム基材1の1リットルあたり 150g固定で形成し、第2NOx 吸着材層21をハニカム基材1の1リットルあたり0g、15g、30g、50g、 100g、 150g、 200g、 250gの8水準でそれぞれ形成した。0gのものについては、第1NOx 吸着材層20を全長に形成し、これは比較例1と同一のものである。
図8に本発明の一実施例に係る排ガス浄化装置を示す。この排ガス浄化装置は、リーンバーンエンジン3の排気系に配置されたNOx 吸着装置4と、NOx 吸着装置4の排ガス下流側に配置されたNOx 吸蔵還元触媒5と、から構成されている。NOx 吸着装置4は、実施例1に係るNOx 吸着装置と同様のものである。NOx 吸着装置4及びNOx 吸蔵還元触媒5は、触媒コンバータ6内に直列に収納されている。
20:第1NOx 吸着材層 21:第2NOx 吸着材層
Claims (7)
- 吸着したNOx の脱離量が最大となるピーク温度が 200℃以下の第1NOx 吸着材と、吸着したNOx の脱離量が最大となるピーク温度が 200℃を超える第2NOx 吸着材とを含み、該第1NOx 吸着材を排ガス上流側に配置し、該第1NOx 吸着材の排ガス下流側に該第2NOx 吸着材を配置したことを特徴とするNOx 吸着装置。
- 前記第1NOx 吸着材はゼオライトである請求項1に記載のNOx 吸着装置。
- 前記第2NOx 吸着材はセリアを含む請求項1又は請求項2に記載のNOx 吸着装置。
- 前記第1NOx 吸着材は、50℃におけるNOx 吸着量が前記第1NOx 吸着材の 100質量部に対して 0.1質量部以上である請求項1〜3のいずれかに記載のNOx 吸着装置。
- 前記第2NOx 吸着材は、 200℃におけるNOx 吸着量が前記第2NOx 吸着材の 100質量部に対して 0.1質量部以上である請求項1〜4のいずれかに記載のNOx 吸着装置。
- 前記第1NOx 吸着材及び前記第2NOx 吸着材は、一つの担体基材の排ガス上流側と排ガス下流側とに形成され、前記第1NOx 吸着材は該担体基材の排ガス流入側端面から全長の1/10〜1/2の範囲に形成されている請求項1〜5のいずれかに記載のNOx 吸着装置。
- 請求項1〜6に記載のいずれかのNOx 吸着装置の排ガス下流側に、NOx を還元浄化するNOx 還元触媒を配置してなることを特徴とする排ガス浄化装置。
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EP08869748A EP2241731B1 (en) | 2008-01-09 | 2008-12-26 | Exhaust purifying device |
US12/812,096 US8435456B2 (en) | 2008-01-09 | 2008-12-26 | NOx adsorbing apparatus and exhaust-gas converting apparatus |
AT08869748T ATE551508T1 (de) | 2008-01-09 | 2008-12-26 | Abgasreinigungsvorrichtung |
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JP2016217357A (ja) * | 2016-09-07 | 2016-12-22 | 日立建機株式会社 | 熱機関の排ガス浄化装置 |
JP2017155643A (ja) * | 2016-03-01 | 2017-09-07 | 株式会社Soken | NOx浄化装置、およびNOx浄化装置の製造方法 |
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WO2013136463A1 (ja) * | 2012-03-14 | 2013-09-19 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP2015025433A (ja) * | 2013-07-29 | 2015-02-05 | 三菱自動車工業株式会社 | 内燃機関の排気浄化装置 |
GB201405868D0 (en) * | 2014-04-01 | 2014-05-14 | Johnson Matthey Plc | Diesel oxidation catalyst with NOx adsorber activity |
GB201517578D0 (en) * | 2015-10-06 | 2015-11-18 | Johnson Matthey Plc | Passive nox adsorber |
US10920645B2 (en) | 2018-08-02 | 2021-02-16 | Ford Global Technologies, Llc | Systems and methods for on-board monitoring of a passive NOx adsorption catalyst |
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JP3278514B2 (ja) | 1993-12-15 | 2002-04-30 | マツダ株式会社 | 排気ガス浄化用触媒構造 |
JPH08281106A (ja) | 1995-04-11 | 1996-10-29 | Nissan Motor Co Ltd | 排気ガス浄化用触媒及びその製造方法 |
JP3601221B2 (ja) | 1996-11-20 | 2004-12-15 | 株式会社豊田中央研究所 | アンモニア脱硝触媒 |
JPH10263368A (ja) | 1997-03-26 | 1998-10-06 | Jisedai Haikazu Shokubai Kenkyusho:Kk | 排ガス浄化装置 |
DE69929396T2 (de) * | 1998-02-05 | 2006-09-21 | Nissan Motor Co., Ltd., Yokohama | Verfahren zur Reinigung von hochsauerstoffhaltigen Abgasen |
JP2001289035A (ja) * | 1998-11-05 | 2001-10-19 | Toyota Motor Corp | 排ガス浄化方法及び排ガス浄化装置 |
US6182443B1 (en) | 1999-02-09 | 2001-02-06 | Ford Global Technologies, Inc. | Method for converting exhaust gases from a diesel engine using nitrogen oxide absorbent |
JP2001198455A (ja) | 2000-01-17 | 2001-07-24 | Toyota Motor Corp | 窒素酸化物吸着材及びその使用方法 |
US6391822B1 (en) * | 2000-02-09 | 2002-05-21 | Delphi Technologies, Inc. | Dual NOx adsorber catalyst system |
JP4144174B2 (ja) * | 2000-10-25 | 2008-09-03 | トヨタ自動車株式会社 | 排ガス浄化装置 |
US7375056B2 (en) * | 2003-07-23 | 2008-05-20 | Unicore Ag & Co. Kg | Method of making a NOx adsorber catalyst |
JP2007075707A (ja) | 2005-09-13 | 2007-03-29 | Hino Motors Ltd | 排気浄化装置 |
JP2007160168A (ja) | 2005-12-12 | 2007-06-28 | Toyota Motor Corp | 排ガス浄化装置 |
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US8955313B2 (en) | 2011-02-18 | 2015-02-17 | Toyota Jidosha Kabushiki Kaisha | Exhaust purification system of internal combustion engine |
JP2017155643A (ja) * | 2016-03-01 | 2017-09-07 | 株式会社Soken | NOx浄化装置、およびNOx浄化装置の製造方法 |
JP2016217357A (ja) * | 2016-09-07 | 2016-12-22 | 日立建機株式会社 | 熱機関の排ガス浄化装置 |
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EP2241731B1 (en) | 2012-03-28 |
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