JP2003097251A - Exhaust gas purifier - Google Patents
Exhaust gas purifierInfo
- Publication number
- JP2003097251A JP2003097251A JP2001287458A JP2001287458A JP2003097251A JP 2003097251 A JP2003097251 A JP 2003097251A JP 2001287458 A JP2001287458 A JP 2001287458A JP 2001287458 A JP2001287458 A JP 2001287458A JP 2003097251 A JP2003097251 A JP 2003097251A
- Authority
- JP
- Japan
- Prior art keywords
- peripheral side
- combustion
- temperature
- catalyst layer
- outer peripheral
- 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 52
- 230000002093 peripheral effect Effects 0.000 claims abstract description 49
- 229910000510 noble metal Inorganic materials 0.000 claims description 23
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims description 10
- 150000001340 alkali metals Chemical class 0.000 claims description 9
- 229910002651 NO3 Inorganic materials 0.000 claims description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 7
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 239000010970 precious metal Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 43
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 abstract description 34
- 229910000027 potassium carbonate Inorganic materials 0.000 abstract description 17
- 101100224414 Caenorhabditis elegans dpf-1 gene Proteins 0.000 abstract description 14
- GWGQWFHTAOMUBD-UHFFFAOYSA-N [[3-[bis(phosphonomethyl)amino]-2-hydroxypropyl]-(phosphonomethyl)amino]methylphosphonic acid Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CC(O)CN(CP(O)(O)=O)CP(O)(O)=O GWGQWFHTAOMUBD-UHFFFAOYSA-N 0.000 abstract description 14
- 238000000746 purification Methods 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 3
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 230000008929 regeneration Effects 0.000 description 22
- 238000011069 regeneration method Methods 0.000 description 22
- 239000007789 gas Substances 0.000 description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 20
- 230000000694 effects Effects 0.000 description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 11
- 229910052878 cordierite Inorganic materials 0.000 description 7
- 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 7
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- -1 alkali metal potassium carbonate Chemical class 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- 102100029859 Zinc finger protein neuro-d4 Human genes 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 235000011151 potassium sulphates Nutrition 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 2
- 101100325793 Arabidopsis thaliana BCA2 gene Proteins 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 102100033007 Carbonic anhydrase 14 Human genes 0.000 description 1
- 101000867862 Homo sapiens Carbonic anhydrase 14 Proteins 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関（以下、
エンジンという）の排ガス中に含まれるパティキュレー
トをパティキュレートフィルタに捕集して焼却除去する
排気浄化装置に関するものである。TECHNICAL FIELD The present invention relates to an internal combustion engine (hereinafter,
The present invention relates to an exhaust gas purification device that collects particulates contained in exhaust gas of an engine) by a particulate filter and incinerates them.
【０００２】[0002]
【関連する背景技術】ディーゼルエンジンから排出され
る排ガスには、炭化水素（ＨＣ）、一酸化炭素（Ｃ
Ｏ）、窒素酸化物（ＮＯx）等のほかにパティキュレー
トが多く含まれており、このパティキュレートを処理す
るための後処理装置として、排ガス中のパティキュレー
トをパティキュレートフィルタに捕集する排気浄化装置
が提案されている。このような排ガス浄化装置では、捕
集したパティキュレートを焼却除去することによりフィ
ルタを再生して、継続的な浄化を可能としているが、パ
ティキュレートの焼却除去はフィルタ温度が所定以上の
運転領域に限られるため、パティキュレートが燃焼し始
める温度を低下させて、フィルタの再生効率を向上させ
る要望がある。[Related Background Art] Exhaust gas emitted from a diesel engine includes hydrocarbons (HC) and carbon monoxide (C).
O), nitrogen oxides (NOx), and the like, and contains a large amount of particulates. As a post-treatment device for treating the particulates, exhaust gas purification in which particulates in exhaust gas are collected by a particulate filter. A device has been proposed. In such an exhaust gas purifying apparatus, the filter is regenerated by incinerating and removing the collected particulates, and continuous purification is possible. There is a demand for improving the regeneration efficiency of the filter by lowering the temperature at which the particulates start to burn because it is limited.
【０００３】そこで、例えば特開平２−１７９１１号公
報、特開平４−１４５９２６号公報に記載の技術では、
フィルタにアルカリ金属やアルカリ土類金属を担持させ
て、これらの材料が有する高い電気陰性度や電子供与性
を利用して、パティキュレートの燃焼開始温度の低下を
図っている。Therefore, for example, in the techniques disclosed in Japanese Patent Application Laid-Open Nos. 2-179911 and 4-145926,
The filter is made to carry an alkali metal or an alkaline earth metal, and the high electronegativity and electron donating property of these materials are utilized to lower the combustion starting temperature of particulates.
【０００４】[0004]
【発明が解決しようとする課題】ところで、パティキュ
レートフィルタ内の温度分布は外周側が低く内周側が高
いことが一般的に知られており、これはフィルタの外壁
面が外気に接して外周側から熱を奪われることや、内周
側に比較して外周側の排気流量が少ないことに起因して
いると考えられる。ところが、上記公報に記載の技術で
は、フィルタにアルカリ金属やアルカリ土類金属を単に
担持しただけのため、燃焼開始温度の低下作用はフィル
タの全範囲に及び、上記した内外周間の温度差に起因す
る再生度合の格差を是正することはできない。即ち、燃
焼開始温度の低下作用の恩恵を受けてフィルタの内周側
が燃焼を開始するときには、外周側は燃焼開始温度に未
だ達しないので、結果的に外周側での燃焼開始が遅れて
フィルタの再生度合に格差が生じ、ひいては排気浄化性
能が低下する問題を生じる。By the way, it is generally known that the temperature distribution inside the particulate filter is low on the outer peripheral side and high on the inner peripheral side. This is because the outer wall surface of the filter is in contact with the outside air from the outer peripheral side. It is considered that this is because the heat is taken away and the exhaust flow rate on the outer peripheral side is smaller than that on the inner peripheral side. However, in the technique described in the above publication, since the filter is simply loaded with an alkali metal or an alkaline earth metal, the lowering effect of the combustion start temperature extends to the entire range of the filter, and the temperature difference between the inner and outer circumferences described above. It is not possible to correct the disparity in the degree of regeneration caused by it. That is, when the inner peripheral side of the filter starts combustion by benefiting from the lowering effect of the combustion start temperature, the outer peripheral side has not yet reached the combustion start temperature, and as a result, the start of combustion on the outer peripheral side is delayed and There is a difference in the degree of regeneration, which causes a problem that the exhaust purification performance is deteriorated.
【０００５】尚、パティキュレートフィルタ内の温度分
布に着目した従来技術として、特開平７−２５９５３４
号公報には、パティキュレートフィルタの外周側に活性
温度が低い触媒を担持し、内周側に活性温度が高い触媒
を担持する構成が記載されている。しかしながら、この
従来技術は、強制再生制御時に投入される追加燃料の反
応速度が内外周で異なることに着目し、この反応速度を
均等化するためのものであり、パティキュレートの燃焼
開始温度を調整するための構成ではないことから、上記
再生度合の格差を是正することは困難である。As a conventional technique focusing on the temperature distribution in the particulate filter, Japanese Patent Laid-Open No. 7-259534 is available.
The publication describes a structure in which a catalyst having a low activation temperature is carried on the outer peripheral side of a particulate filter and a catalyst having a high activation temperature is carried on the inner peripheral side. However, this prior art focuses on the fact that the reaction speed of the additional fuel that is input during forced regeneration control differs between the inner and outer peripheries, and is for equalizing this reaction speed, and the combustion start temperature of the particulates is adjusted. Therefore, it is difficult to correct the above-mentioned difference in the degree of reproduction.
【０００６】本発明の目的は、フィルタの内外周間の温
度差に起因する再生度合の格差を是正し、もって、排気
浄化性能を向上させることができる排気浄化装置を提供
することにある。An object of the present invention is to provide an exhaust gas purification device which can correct the difference in the degree of regeneration caused by the temperature difference between the inner and outer circumferences of the filter and thus improve the exhaust gas purification performance.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明では、機関の排気通路にパティキュ
レートフィルタを設けた排気浄化装置において、フィル
タ上の外周側部位に、アルカリ金属及びアルカリ土類金
属からなる群から選択される少なくとも一つを担持する
ことにより、内周側部位より外周側部位の燃焼開始温度
が低くなるように調整した。In order to achieve the above object, according to the invention of claim 1, in an exhaust gas purification device having a particulate filter in the exhaust passage of an engine, an alkali metal and By carrying at least one selected from the group consisting of alkaline earth metals, it was adjusted so that the combustion start temperature was lower in the outer peripheral portion than in the inner peripheral portion.
【０００８】従って、フィルタに捕集されたパティキュ
レートはフィルタ温度の上昇時に燃焼し、これによりフ
ィルタが再生される。ここで、フィルタの外周側部位
は、外気に接した外壁面からの放熱や排気流量の減少に
起因して、内周側部位より温度が低くなるが、この外周
側部位はアルカリ金属やアルカリ土類金属の担持により
パティキュレートの燃焼開始温度が低下されているた
め、パティキュレートの燃焼開始が早められる。その結
果、フィルタの内外周の燃焼状態が均一化されて、フィ
ルタの再生度合の格差が是正される。Therefore, the particulates collected by the filter burn when the temperature of the filter rises, whereby the filter is regenerated. Here, the outer peripheral side portion of the filter has a lower temperature than the inner peripheral side portion due to the heat radiation from the outer wall surface in contact with the outside air and the decrease of the exhaust flow rate, but the outer peripheral side portion has an alkali metal or alkaline earth. Since the combustion start temperature of the particulates is lowered by supporting the metal like metals, the start of the combustion of the particulates is accelerated. As a result, the combustion states of the inner and outer circumferences of the filter are made uniform, and the difference in the degree of regeneration of the filter is corrected.
【０００９】又、請求項２の発明では、フィルタ上の内
周側部位に触媒貴金属を担持した。アルカリ金属やアル
カリ土類金属に比較すれば弱いものの、貴金属もパティ
キュレートの燃焼開始温度を低下させる作用を奏するた
め、内周側部位に貴金属を担持しない場合に比較して、
フィルタ全体としての燃焼開始温度がより低下し、再生
度合の格差を是正した上で、再生効率が一層向上され
る。According to the second aspect of the invention, the catalytic noble metal is supported on the inner peripheral side portion of the filter. Although weaker than alkaline metals and alkaline earth metals, since noble metals also have the effect of lowering the combustion start temperature of particulates, compared to the case where no precious metal is supported on the inner peripheral side part,
The combustion start temperature of the filter as a whole is further lowered, the difference in the degree of regeneration is corrected, and the regeneration efficiency is further improved.
【００１０】更に、請求項３の発明では、アルカリ金属
及びアルカリ土類金属からなる群から選択される少なく
とも一つを炭酸塩として担持させた。炭酸塩は、例えば
硝酸塩や硫酸塩に比較してパティキュレートの燃焼開始
温度の低下作用に優れることから、内外周の燃焼状態の
均一化がより確実に達成される。一方、請求項４の発明
では、フィルタ上の外周側部位に担持した炭酸塩の硝酸
塩又は硫酸塩への変化を抑制すべく、貴金属の担持量を
０若しくは微量に調整した。炭酸塩が貴金属と反応した
場合には、より燃焼開始温度の低下作用が弱い硝酸塩又
は硫酸塩に変化するが、このような事態が未然に防止さ
れ、又、炭酸塩の反応がパティキュレートの燃焼開始温
度を低下させるためにほとんど費やされるため、結果と
して燃焼開始温度の低下作用が最大限に得られる。Further, in the invention of claim 3, at least one selected from the group consisting of alkali metals and alkaline earth metals is supported as a carbonate. Carbonate is superior to, for example, nitrate or sulfate in the effect of lowering the combustion start temperature of particulates, so that the combustion state of the inner and outer circumferences is more reliably achieved. On the other hand, in the invention of claim 4, the amount of the noble metal carried is adjusted to 0 or a small amount in order to suppress the change of the carbonate carried on the outer peripheral side portion on the filter into the nitrate or the sulfate. When a carbonate reacts with a noble metal, it changes to a nitrate or a sulfate, which has a weaker action of lowering the combustion start temperature, but such a situation is prevented in advance, and the reaction of the carbonate causes the combustion of particulates. Most of the money is spent to reduce the starting temperature, and as a result, the effect of reducing the combustion starting temperature is maximized.
【００１１】[0011]
【発明の実施の形態】以下、本発明を具体化した排気浄
化装置の一実施形態を説明する。本実施形態の排気浄化
装置はディーゼルエンジンに適用され、当該排気浄化装
置のフィルタは、ディーゼルパティキュレートフィルタ
（以下、ＤＰＦという）としてエンジンの排気通路に設
けられている。図１は本実施形態の排気浄化装置に備え
られたＤＰＦを示す断面図、図２はＤＰＦを示す正面
図、図３は図１のＡ部分の詳細を示す部分拡大断面図で
ある。これらの図に示すように、ＤＰＦ１は多数のセル
２ａからなるハニカム（モノリス）型の担体２を有して
いる。担体２の各セル２ａはそれぞれ断面四角状に形成
され、隣接するセル２ａの上流側と下流側との開口部は
交互にプラグ３で閉鎖されている。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an exhaust gas purification device embodying the present invention will be described below. The exhaust emission control device of the present embodiment is applied to a diesel engine, and the filter of the exhaust emission control device is provided as a diesel particulate filter (hereinafter referred to as DPF) in the exhaust passage of the engine. FIG. 1 is a sectional view showing a DPF provided in the exhaust emission control device of this embodiment, FIG. 2 is a front view showing the DPF, and FIG. 3 is a partially enlarged sectional view showing details of a portion A in FIG. As shown in these figures, the DPF 1 has a honeycomb (monolith) type carrier 2 composed of a large number of cells 2a. Each cell 2a of the carrier 2 is formed in a rectangular cross section, and the openings of the adjacent cells 2a on the upstream side and the downstream side are alternately closed by plugs 3.
【００１２】担体２はコージェライト（Ｍg2Ａl4Ｓi5Ｏ
18）で製作されており、例えば、アルミナ源の粉末、シ
リカ源の粉末、及びマグネシア源の粉末を、アルミナ、
シリカ、マグネシアの割合がコージェライト組成になる
ように混合したものを水に分散させ、その固形分をハニ
カム状に成形し、このハニカム成形体を焼成したもので
ある。尚、この担体２の成形時に、前記プラグ３も同時
に一体成形される。The carrier 2 is cordierite (Mg 2 Al 4 Si 5 O).
18 ), for example, alumina source powder, silica source powder, and magnesia source powder are
A mixture of silica and magnesia having a cordierite composition is dispersed in water, the solid content thereof is formed into a honeycomb shape, and the honeycomb formed body is fired. When the carrier 2 is molded, the plug 3 is also integrally molded.
【００１３】コージェライト担体２ａ上には触媒層が担
持されているが、図１及び図２に担持領域を示すよう
に、本実施形態では触媒層を同心円状の外周側と内周側
とに２分し、各触媒層４ａ，４ｂの組成を異にしてい
る。即ち、内周側の触媒層４ａ（内周側部位）として貴
金属の白金（Ｐt）やセリウム（Ｃe）が担持される一
方、外周側の触媒層４ｂ（外周側部位）としてアルカリ
金属の炭酸カリウム（Ｋ2ＣＯ3）が担持されている。本
実施形態では、内周側触媒層４ａの貴金属の担持量が
０．１〜１０ｇ/ｌの範囲で設定され、外周側触媒層４
ｂのアルカリ金属の担持量が１〜１００ｇ/ｌの範囲で
設定されている。A catalyst layer is carried on the cordierite carrier 2a. As shown in the carrying regions in FIGS. 1 and 2, the catalyst layer is provided on the outer peripheral side and the inner peripheral side of the concentric circles in this embodiment. The catalyst layers 4a and 4b are divided into two parts and have different compositions. That is, the noble metal platinum (Pt) or cerium (Ce) is carried as the inner catalyst layer 4a (inner part), while the alkali metal potassium carbonate is used as the outer catalyst layer 4b (outer part). (K 2 CO 3 ) is carried. In the present embodiment, the loading amount of the noble metal in the inner catalyst layer 4a is set in the range of 0.1 to 10 g / l, and the outer catalyst layer 4 is
The amount of the alkali metal carried in b is set in the range of 1 to 100 g / l.
【００１４】内外周の触媒層４ａ，４ｂは、例えば以下
のようにして、コージェライト担体３の表面に形成され
る。内周側触媒層４ａは、白金やセリウム等の貴金属を
含むスラリー中にコージェライト担体２を浸漬した後、
乾燥・焼成することにより形成され、同様に外周側触媒
層４ｂは、炭酸カリウムを含むスラリー中にコージェラ
イト担体２を浸漬した後、乾燥・焼成することにより形
成される。これらの触媒層４ａ，４ｂの形成処理は個別
に順を追って実施され、一方の触媒層４ａ，４ｂの形成
時には、他方の触媒層４ａ，４ｂが形成されるセル２ａ
内にスラリーが侵入するのを防止すべく、該当するセル
２ａの開口部を閉鎖した状態でスラリーへの浸漬を実施
する。The inner and outer peripheral catalyst layers 4a and 4b are formed on the surface of the cordierite carrier 3 as follows, for example. The inner catalyst layer 4a is prepared by immersing the cordierite carrier 2 in a slurry containing a noble metal such as platinum or cerium.
It is formed by drying and baking, and similarly, the outer peripheral catalyst layer 4b is formed by immersing the cordierite carrier 2 in a slurry containing potassium carbonate and then drying and baking. The formation process of these catalyst layers 4a and 4b is individually carried out in order, and when forming one catalyst layer 4a and 4b, the cell 2a in which the other catalyst layer 4a and 4b is formed.
In order to prevent the slurry from entering the inside, the dipping in the slurry is performed with the opening of the corresponding cell 2a closed.
【００１５】以上のように構成された排気浄化装置にお
いて、エンジンからの排ガスは、図１に矢印で示すよう
に各セル２ａを区画する濾過面２ｂを透過して流通し、
含有するパティキュレートを濾過面２ｂに捕集された後
に大気中に排出される。濾過面２ｂに堆積したパティキ
ュレートは、ＤＰＦ温度が所定以上に達する運転状態に
おいて焼却除去され、この再生処理が繰り返されること
により、ＤＰＦ１は継続的にパティキュレートの浄化作
用を奏する。In the exhaust gas purifying apparatus constructed as described above, the exhaust gas from the engine passes through the filtering surface 2b that partitions each cell 2a as shown by the arrow in FIG.
The contained particulates are collected on the filtration surface 2b and then discharged into the atmosphere. The particulate matter deposited on the filtration surface 2b is incinerated and removed in an operating state in which the DPF temperature reaches a predetermined temperature or higher, and by repeating this regeneration treatment, the DPF1 continuously exerts a particulate purification effect.
【００１６】このようなＤＰＦ１の再生は、機関負荷や
回転が高い運転領域において排気温度の上昇に伴って自
ずと行われる一方（連続再生）、ＤＰＦ１の前後差圧等
に基づいてパティキュレートの捕集量が限界と判断され
るときには、周知の吸排気絞りや噴射時期のリタード、
或いはコモンレール式ディーゼルエンジンでは膨張行程
や排気行程でのポスト噴射が実行されて排気温度が上昇
され、パティキュレートが強制的に焼却除去される（強
制再生）。Such regeneration of the DPF 1 is naturally carried out along with an increase in the exhaust gas temperature in an operating region where engine load and rotation are high (continuous regeneration), while particulates are collected based on the differential pressure across the DPF 1 and the like. When the amount is judged to be the limit, well-known intake and exhaust throttle and retard of injection timing,
Alternatively, in a common-rail diesel engine, post injection is performed in the expansion stroke and exhaust stroke to raise the exhaust temperature and forcibly remove particulates by incineration (forced regeneration).
【００１７】ところで、ＤＰＦ１の外周側触媒層４ｂ
は、外気に接した外壁面からの放熱や排気流量の減少に
起因して、内周側触媒層４ｂより格段に温度が低く、そ
の差は１００℃を遥かに越えることが知られている。こ
こで、本発明者は、内外周の触媒層４ａ，４ｂでパティ
キュレートの燃焼開始温度にどの程度の差が生じている
かを実験し、図４に示すように、貴金属が担持された内
周側触媒層４ａでは燃焼開始温度が５５０℃程度であっ
たのに対し、炭酸カリウムが担持された外周側触媒層４
ｂでは３５０℃程度まで低下することを確認した。By the way, the catalyst layer 4b on the outer peripheral side of the DPF 1
It is known that the temperature is significantly lower than that of the inner peripheral side catalyst layer 4b due to the heat radiation from the outer wall surface in contact with the outside air and the reduction of the exhaust flow rate, and the difference is far more than 100 ° C. Here, the present inventor conducted an experiment to find out how much the difference between the combustion start temperatures of the particulates is generated in the inner and outer catalyst layers 4a and 4b, and as shown in FIG. While the combustion start temperature was about 550 ° C. in the side catalyst layer 4a, the outer peripheral side catalyst layer 4 supporting potassium carbonate was used.
It was confirmed that in b, the temperature dropped to about 350 ° C.
【００１８】この燃焼開始温度の相違により上記した内
外周の実際の温度差が相殺されることになり、ＤＰＦ１
の内外周でのパティキュレートの燃焼タイミングが近づ
くと共に、その後の燃焼の進行状況や燃焼の終了タイミ
ングも近似したものとなる。つまり、内外周でのパティ
キュレートの燃焼状態のばらつきが是正されるため、内
外周間の温度差に起因して生じるＤＰＦ１の再生度合の
格差が是正され、もって、排気浄化性能を向上させるこ
とができる。Due to the difference in the combustion start temperature, the above-mentioned actual difference in temperature between the inner and outer circumferences is offset, and the DPF1
As the combustion timing of the particulates in the inner and outer circumferences approaches, the progress of the subsequent combustion and the end timing of the combustion become similar. That is, since the variation in the particulate combustion state in the inner and outer circumferences is corrected, the difference in the degree of regeneration of the DPF 1 caused by the temperature difference between the inner and outer circumferences is corrected, and thus the exhaust purification performance can be improved. it can.
【００１９】又、以上のようにＤＰＦ１に担持する触媒
層４ａ，４ｂの構成を変更するだけであり、既存の排気
システムを変更する必要がないことから、極めて容易に
実現することができる。しかも、燃焼状態の均一化は、
従来は遅れ気味であったＤＰＦ１の外周側の再生を促進
する一方、外周側が再生する場合に従来は過熱気味であ
った内周側の温度上昇を抑制することに繋がる。その結
果、外周側の再生促進により、ＤＰＦ１全体としての再
生所要時間を短縮化し、上記した強制再生の実施時に
は、例えばポスト噴射の回数や燃料増加量を低減して燃
費悪化を抑制でき、一方、内周側の温度上昇の抑制によ
り、ＤＰＦ１の溶損等を未然に防止して耐久性を向上で
きるという利点も得られる。Further, as described above, the structure of the catalyst layers 4a and 4b supported on the DPF 1 is only changed, and it is not necessary to change the existing exhaust system, so that it can be realized very easily. Moreover, the homogenization of the combustion state is
While the regeneration of the outer peripheral side of the DPF 1 which has been delayed in the past is promoted, it leads to the suppression of the temperature rise of the inner peripheral side which is conventionally overheated when the outer peripheral side is regenerated. As a result, by promoting regeneration on the outer peripheral side, the time required for regeneration of the DPF 1 as a whole can be shortened, and when performing the above-mentioned forced regeneration, for example, the number of post injections and the amount of fuel increase can be reduced to suppress deterioration of fuel consumption. By suppressing the temperature rise on the inner peripheral side, there is an advantage that the melting loss of the DPF 1 can be prevented and the durability can be improved.
【００２０】尚、図４に示すように、カリウムの他の酸
化物である硝酸カリウム（ＫＮＯ3）の場合には、パテ
ィキュレートの燃焼開始温度は４００℃程度であり、硫
酸カリウム（Ｋ2ＳＯ4）の場合には４７０℃程度であ
り、共に燃焼開始温度の低下作用は奏するものの、炭酸
カリウムほど十分ではないことがわかる。つまり、燃焼
開始温度の低下作用に優れた炭酸カリウムを適用するこ
とにより、上記内外周の燃焼状態の均一化がより確実に
実現され、排気浄化性能の十分に向上させることができ
る。As shown in FIG. 4, in the case of potassium nitrate (KNO 3 ) which is another oxide of potassium, the combustion starting temperature of particulates is about 400 ° C. and potassium sulfate (K 2 SO 4 In the case of 1), the temperature is about 470 ° C., and although both have the effect of lowering the combustion start temperature, it is understood that they are not as sufficient as potassium carbonate. That is, by applying potassium carbonate, which has an excellent effect of lowering the combustion start temperature, it is possible to more reliably realize the uniform combustion state of the inner and outer circumferences, and it is possible to sufficiently improve the exhaust gas purification performance.
【００２１】一方、仮に外周側触媒層４ｂ中の炭酸カリ
ウムに白金（Ｐt）等の貴金属を共存させた場合、所謂
ＮＯx吸蔵触媒におけるＮＯx（窒素酸化物）吸着時と同
様に、貴金属上で炭酸カリウムが排ガス中のＮＯと反応
して、硝酸カリウムが生成されたり、ＳＯx（硫黄酸化
物）吸着時と同様に、貴金属上で炭酸カリウムが排ガス
中の硫黄成分ＳＯ2と反応して、硫酸カリウムが生成さ
れたりする現象が生じる。つまり、炭酸カリウムがより
燃焼開始温度の低下作用の弱い硝酸カリウムや硫酸カリ
ウムに変質してしまうが、本実施形態では外周側触媒層
４ｂに貴金属を含有していないため、このような事態を
未然に防止できるという利点もある。又、貴金属との反
応を防止することにより、炭酸カリウムの反応はパティ
キュレートの燃焼開始温度を低下させるために全て費や
されるため、結果として燃焼開始温度の低下作用を最大
限に得ることができる。On the other hand, if a noble metal such as platinum (Pt) is allowed to coexist with potassium carbonate in the outer catalyst layer 4b, carbon dioxide is adsorbed on the noble metal in the same manner as when adsorbing NOx (nitrogen oxide) on a so-called NOx storage catalyst. Potassium nitrate reacts with NO in the exhaust gas, and potassium carbonate reacts with the sulfur component SO 2 in the exhaust gas on the noble metal in the same manner as when SOx (sulfur oxide) is adsorbed. The phenomenon that it is generated occurs. In other words, potassium carbonate is transformed into potassium nitrate or potassium sulfate, which has a weaker action of lowering the combustion starting temperature, but in the present embodiment, since the outer peripheral side catalyst layer 4b does not contain a noble metal, such a situation occurs in advance. There is also an advantage that it can be prevented. Further, by preventing the reaction with the noble metal, the reaction of potassium carbonate is entirely spent for lowering the combustion start temperature of the particulates, and as a result, the effect of lowering the combustion start temperature can be maximized.
【００２２】又、炭酸カリウムに比較すれば弱いもの
の、内周側触媒層４ａを構成する貴金属も、酸素
（Ｏ2）による燃焼促進でパティキュレートの燃焼開始
温度を低下させる作用を奏する。よって、内周側触媒層
４ａを形成しない場合（無担持の場合）に比較して、Ｄ
ＰＦ１全体としての燃焼開始温度がより低下し、上記の
ように再生度合の格差を是正した上で、再生効率を一層
向上できるという利点も得られる。Although weaker than potassium carbonate, the noble metal forming the inner catalyst layer 4a also has the effect of lowering the combustion start temperature of particulates by promoting combustion by oxygen (O 2 ). Therefore, as compared with the case where the inner peripheral side catalyst layer 4a is not formed (when not supported), D
The combustion start temperature of the PF1 as a whole is further lowered, and the advantage that the regeneration efficiency can be further improved after correcting the difference in the degree of regeneration as described above.
【００２３】以上で実施形態の説明を終えるが、本発明
の態様はこの実施形態に限定されるものではない。例え
ば、上記実施形態では、担体２の材料としてをコージェ
ライトを適用したが、ＤＰＦ１の担体２として要求され
る強度や耐熱性を満足できる材料であれば、これに限る
ことはなく、例えばシリコンカーバイト（ＳiＣ）担
体、或いはステンレス等からなる金属繊維やセラミック
繊維を所定の空間充填率となるように分散状態で充填・
固定化したフィルタで構成してもよい。Although the embodiment has been described above, the aspect of the present invention is not limited to this embodiment. For example, although cordierite is applied as the material of the carrier 2 in the above-described embodiment, the material is not limited to this as long as it is a material that can satisfy the strength and heat resistance required for the carrier 2 of the DPF 1. Filling a bite (SiC) carrier or metal fiber or ceramic fiber made of stainless steel or the like in a dispersed state so as to have a predetermined space filling rate.
You may comprise with the fixed filter.
【００２４】又、上記実施形態では、担体２上にカリウ
ムを炭酸塩の形で担持したが、硝酸塩や硫酸塩、或いは
酸化物や水酸化物等の形で担持してもよい。例えば硝酸
塩や硫酸塩の場合でも、図４に基づいて説明したよう
に、貴金属を担持した場合に比較して十分にパティキュ
レートの燃焼開始温度を低下可能であり、内外周の実際
の温度差が小さい場合には、寧ろ硝酸塩や硫酸塩の方が
パティキュレートの燃焼状態を均一化できるため望まし
い場合もある。又、カリウム以外のアルカリ金属、例え
ばリチウム（Ｌi）、ナトリウム（Ｎa）、ルビジウム
（Ｒb）等を担持したり、アルカリ希土類であるバリウ
ム（Ｂa）、ベリリウム（Ｂe）、マグネシウム（Ｍ
g）、カルシウム（Ｃa）、ストロンチウム（Ｓr）、ラ
ジウム（Ｒa）等を担持してもよい。In the above embodiment, potassium is supported on the carrier 2 in the form of carbonate, but it may be supported in the form of nitrate, sulfate, oxide, hydroxide or the like. For example, even in the case of nitrate or sulfate, as described with reference to FIG. 4, the combustion start temperature of particulates can be sufficiently lowered as compared with the case of supporting a noble metal, and the actual temperature difference between the inner and outer circumferences can be reduced. If it is small, it may be preferable to use a nitrate or a sulfate rather than because a combustion state of particulates can be made uniform. Further, an alkali metal other than potassium, for example, lithium (Li), sodium (Na), rubidium (Rb), etc. is supported, or alkaline rare earths such as barium (Ba), beryllium (Be), magnesium (M
g), calcium (Ca), strontium (Sr), radium (Ra) and the like may be supported.
【００２５】更に、上記実施形態では、外周側触媒層４
ｂを炭酸カリウムのみから形成したが、炭酸カリウムに
白金（Ｐt）等の貴金属を共存させてもよい。この場合
には、上記のように貴金属により炭酸カリウムが変質す
る可能性はあるものの、貴金属を含有した外周側触媒層
４ｂは吸蔵型ＮＯx触媒と同様にリーン雰囲気下でＮＯx
を吸蔵する作用を奏するため、吸蔵したＮＯxがパティ
キュレートの燃焼に利用されるという別の作用が得られ
る。よって、双方の利害特質を勘案して、貴金属の担持
の有無や担持量を決定することが望ましい。又、貴金属
以外の触媒材料、例えば、アルミナ等の触媒基材、遷移
金属、希土類を炭酸カリウムに共存させてもよい。Further, in the above embodiment, the outer peripheral catalyst layer 4
Although b was formed only from potassium carbonate, noble metal such as platinum (Pt) may coexist in potassium carbonate. In this case, although the potassium carbonate may be altered by the noble metal as described above, the outer peripheral side catalyst layer 4b containing the noble metal does not contain NOx in a lean atmosphere like the occlusion type NOx catalyst.
Since the effect of occluding NOx is exhibited, another effect that the occluded NOx is utilized for combustion of particulates can be obtained. Therefore, it is desirable to determine the presence / absence of the noble metal and the amount of the noble metal supported in consideration of both interests. Further, a catalyst material other than a noble metal, for example, a catalyst base material such as alumina, a transition metal, or a rare earth element may be allowed to coexist in potassium carbonate.
【００２６】一方、上記実施形態では、ＤＰＦ１の触媒
層４ａ，４ｂを同心円状の内外周に２分割したが、ＤＰ
Ｆ１の実際の温度分布は内外周間で連続的に変化してい
るため、例えば触媒層を内外周間で３分割して、外周側
の触媒層ほど炭酸カリウムの担持量を増加させたり、或
いは、内周側から外周側に炭酸カリウムの担持量を連続
的に増加させたりしてもよい。又、各触媒層４ａ，４ｂ
は必ずしも同心円状に分割する必要はなく、例えば車体
床下でのレイアウトの関係で、ＤＰＦ１の外壁面の一部
が外気から遮られるときには、その一部については外周
側触媒層４ｂの当該箇所を内周側触媒層４ａと同一組成
（例えば、貴金属のみ担持）として、高い燃焼開始温度
に保ってもよい。On the other hand, in the above embodiment, the catalyst layers 4a and 4b of the DPF 1 are divided into two concentric inner and outer circumferences.
Since the actual temperature distribution of F1 continuously changes between the inner and outer circumferences, for example, the catalyst layer is divided into three between the inner and outer circumferences to increase the amount of potassium carbonate carried on the outermost catalyst layer, or The amount of potassium carbonate carried may be continuously increased from the inner peripheral side to the outer peripheral side. Also, each catalyst layer 4a, 4b
Does not necessarily have to be divided into concentric circles. For example, when a part of the outer wall surface of the DPF 1 is shielded from the outside air due to the layout under the floor of the vehicle body, a part of the outer wall surface of the DPF 1 is located inside the outer catalyst layer 4b. The composition may be the same as that of the peripheral catalyst layer 4a (for example, only noble metal is supported), and the combustion start temperature may be kept high.
【００２７】[0027]
【発明の効果】以上説明したように請求項１の発明の排
気浄化装置によれば、フィルタの内外周間の温度差に起
因する再生度合の格差を是正し、もって、排気浄化性能
を向上させることができる。又、請求項２の発明の排気
浄化装置によれば、請求項１の発明に加えて、フィルタ
全体としての燃焼開始温度をより低下させ、再生度合の
格差を是正した上で、再生効率を一層向上することがで
きる。As described above, according to the exhaust gas purifying apparatus of the present invention, the difference in the degree of regeneration due to the temperature difference between the inner and outer circumferences of the filter is corrected, and the exhaust gas purifying performance is improved. be able to. According to the exhaust gas purifying apparatus of the invention of claim 2, in addition to the invention of claim 1, the combustion starting temperature of the filter as a whole is further lowered, the difference in the degree of regeneration is corrected, and the regeneration efficiency is further improved. Can be improved.
【００２８】更に、請求項３の発明の排気浄化装置によ
れば、請求項１の発明に加えて、パティキュレートの燃
焼開始温度の低下作用に優れる炭酸塩を担持するため、
内外周の燃焼状態の均一化をより確実に達成することが
できる。一方、請求項４の発明の排気浄化装置によれ
ば、請求項３の発明に加えて、炭酸塩と貴金属との反応
を防止するため、燃焼開始温度の低下作用を最大限に得
て、内外周の燃焼状態を更に均一化することができる。Further, according to the exhaust gas purifying apparatus of the third aspect of the present invention, in addition to the first aspect of the present invention, since it carries a carbonate excellent in the effect of lowering the combustion starting temperature of particulates,
It is possible to more reliably achieve uniform combustion in the inner and outer circumferences. On the other hand, according to the exhaust gas purifying apparatus of the invention of claim 4, in addition to the invention of claim 3, in order to prevent the reaction between the carbonate and the noble metal, the effect of lowering the combustion start temperature is maximized, and The combustion state of the circumference can be made more uniform.
【図面の簡単な説明】[Brief description of drawings]
【図１】実施形態の排気浄化装置に備えられたＤＰＦを
示す断面図である。FIG. 1 is a cross-sectional view showing a DPF provided in an exhaust emission control device of an embodiment.
【図２】ＤＰＦを示す正面図である。FIG. 2 is a front view showing a DPF.
【図３】図１のＡ部分の詳細を示す部分拡大断面図であ
る。FIG. 3 is a partially enlarged sectional view showing details of a portion A in FIG.
【図４】触媒層の組成と燃焼開始温度との関係を示す説
明図である。FIG. 4 is an explanatory diagram showing the relationship between the composition of the catalyst layer and the combustion start temperature.
１ ＤＰＦ（フィルタ） ４ａ 内周側触媒層（内周側部位） ４ｂ 外周側触媒層（外周側部位） 1 DPF (filter) 4a Inner peripheral catalyst layer (inner peripheral portion) 4b Outer peripheral side catalyst layer (outer peripheral side portion)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ０１Ｊ 35/04 ３０１ Ｂ０１Ｊ 37/02 ３０１Ｅ 37/02 ３０１ Ｆ０１Ｎ 3/10 Ａ 3/24 Ｅ Ｆ０１Ｎ 3/10 Ｂ０１Ｄ 53/36 １０３Ｃ 3/24 ＺＡＢ Ｆターム(参考） 3G090 AA02 AA03 BA01 CA00 CA01 EA04 3G091 AA18 AA28 AB02 AB06 AB09 AB13 BA00 CB02 CB03 GA06 GB02W GB03W GB05W GB17X 4D019 AA01 BA06 BB06 BC07 CA01 CB04 CB09 4D048 AA14 AB01 BA14X BA15Y BA19X BA30X BA31Y BA32Y BA33Y BA34Y BA45Y BB02 BB14 BB16 CC41 4G069 AA03 AA08 BB16A BB16B BC01A BC03B BC08A BC32A BC33A BC43B BC69A BC75B CA03 CA07 CA18 DA06 EA19 EC29 FA03 FB15 FB17 FB18 FB19 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) B01J 35/04 301 B01J 37/02 301E 37/02 301 F01N 3/10 A 3/24 E F01N 3/10 B01D 53/36 103C 3/24 ZAB F term (reference) 3G090 AA02 AA03 BA01 CA00 CA01 EA04 3G091 AA18 AA28 AB02 AB06 AB09 AB13 BA00 CB02 CB03 GA06 GB02W GB03W GB05W GB17B14 BB01 BA14 BB04 BA14 BB04 BC14 CA01 CA01 CA06 CA14 BA30X BA31Y BA32Y BA33Y BA34Y BA45Y BB02 BB14 BB16 CC41 4G069 AA03 AA08 BB16A BB16B BC01A BC03B BC08A BC32A BC33A BC43B BC69A BC75B CA03 CA07 CA18 DA06 EA19 EC29 FA03 FB15 FB17 FB18 FB18
Claims (4)
ルタを設けた排気浄化装置において、 上記フィルタ上の外周側部位に、アルカリ金属及びアル
カリ土類金属からなる群から選択される少なくとも一つ
を担持することにより、内周側部位より上記外周側部位
の燃焼開始温度が低くなるように調整したことを特徴と
する排気浄化装置。1. An exhaust emission control device having a particulate filter in an exhaust passage of an engine, wherein at least one selected from the group consisting of alkali metals and alkaline earth metals is carried on the outer peripheral side portion on the filter. Thus, the exhaust emission control device is characterized in that the combustion start temperature of the outer peripheral side portion is adjusted to be lower than that of the inner peripheral side portion.
金属が担持されていることを特徴とする請求項１に記載
の排気浄化装置。2. The exhaust emission control device according to claim 1, wherein a catalytic noble metal is carried on an inner peripheral side portion of the filter.
からなる群から選択される少なくとも一つは炭酸塩とし
て担持されることを特徴とする請求項１に記載の排気浄
化装置。3. The exhaust emission control device according to claim 1, wherein at least one selected from the group consisting of the alkali metal and the alkaline earth metal is carried as a carbonate.
持した炭酸塩の硝酸塩又は硫酸塩への変化を抑制すべ
く、貴金属の担持量が０若しくは微量に調整されている
ことを特徴とする請求項３に記載の排気浄化装置。4. The amount of precious metal carried at the outer peripheral side of the filter is adjusted to 0 or a small amount in order to suppress the change of the carried carbonate to nitrate or sulfate. The exhaust emission control device according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001287458A JP2003097251A (en) | 2001-09-20 | 2001-09-20 | Exhaust gas purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001287458A JP2003097251A (en) | 2001-09-20 | 2001-09-20 | Exhaust gas purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003097251A true JP2003097251A (en) | 2003-04-03 |
Family
ID=19110266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001287458A Withdrawn JP2003097251A (en) | 2001-09-20 | 2001-09-20 | Exhaust gas purifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003097251A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007526827A (en) * | 2004-03-05 | 2007-09-20 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | Method for producing catalytic wall-flow filter with catalytic action |
| JP2012077693A (en) * | 2010-10-01 | 2012-04-19 | Mitsubishi Motors Corp | Exhaust emission control device |
| US8899023B2 (en) | 2003-08-05 | 2014-12-02 | Basf Corporation | Catalyzed SCR filter and emission treatment system |
| JP2016061153A (en) * | 2014-09-12 | 2016-04-25 | マツダ株式会社 | Particulate filter with catalyst |
-
2001
- 2001-09-20 JP JP2001287458A patent/JP2003097251A/en not_active Withdrawn
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| US9039982B2 (en) | 2003-08-05 | 2015-05-26 | Basf Corporation | Catalyzed SCR filter and emission treatment system |
| US9517456B2 (en) | 2003-08-05 | 2016-12-13 | Basf Corporation | Catalyzed SCR filter and emission treatment system |
| US9517455B2 (en) | 2003-08-05 | 2016-12-13 | Basf Corporation | Catalyzed SCR filter and emission treatment system |
| US9757717B2 (en) | 2003-08-05 | 2017-09-12 | Basf Corporation | Method for disposing SCR composition on a wall flow monolith |
| JP2007526827A (en) * | 2004-03-05 | 2007-09-20 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | Method for producing catalytic wall-flow filter with catalytic action |
| JP2012077693A (en) * | 2010-10-01 | 2012-04-19 | Mitsubishi Motors Corp | Exhaust emission control device |
| JP2016061153A (en) * | 2014-09-12 | 2016-04-25 | マツダ株式会社 | Particulate filter with catalyst |
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