JP2001115832A - Exhaust gas purification device - Google Patents
Exhaust gas purification deviceInfo
- Publication number
- JP2001115832A JP2001115832A JP29527599A JP29527599A JP2001115832A JP 2001115832 A JP2001115832 A JP 2001115832A JP 29527599 A JP29527599 A JP 29527599A JP 29527599 A JP29527599 A JP 29527599A JP 2001115832 A JP2001115832 A JP 2001115832A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- adsorbent
- section
- way catalyst
- cross
- 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- Withdrawn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
- 238000000746 purification Methods 0.000 title claims abstract description 27
- 239000003054 catalyst Substances 0.000 claims abstract description 59
- 239000003463 adsorbent Substances 0.000 claims abstract description 28
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 229930195733 hydrocarbon Natural products 0.000 claims description 50
- 150000002430 hydrocarbons Chemical class 0.000 claims description 50
- 239000000463 material Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 8
- 230000004913 activation Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 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
- 238000003795 desorption Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 101100321669 Fagopyrum esculentum FA02 gene Proteins 0.000 description 1
- 101100293260 Homo sapiens NAA15 gene Proteins 0.000 description 1
- 102100026781 N-alpha-acetyltransferase 15, NatA auxiliary subunit Human genes 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
(57)【要約】
【課題】 特に運転開始当初の浄化性能を向上させた排
気浄化装置を提供する。
【解決手段】 上流側にＨＣ吸着部１０、下流側に三元
触媒部２０を配置した直列構成の排気浄化装置１であっ
て、下流側に設置する三元触媒部２０の断面積を上流側
に設置するＨＣ吸着材部１０の断面積より小さく設定し
ている。
(57) [Summary] [PROBLEMS] To provide an exhaust gas purification apparatus with improved purification performance especially at the start of operation. SOLUTION: An exhaust gas purification apparatus 1 having a series configuration in which an HC adsorbing section 10 is arranged on an upstream side and a three-way catalyst section 20 is arranged on a downstream side, wherein a cross-sectional area of the three-way catalyst section 20 installed on the downstream side is increased. Is set to be smaller than the cross-sectional area of the HC adsorbent section 10 installed in the first section.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関等の排気
浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust emission control device for an internal combustion engine or the like.
【０００２】[0002]
【従来の技術】内燃機関の排気通路に排気浄化触媒を配
置して、排気中の炭化水素（ＨＣ）、一酸化炭素（Ｃ
Ｏ）、窒素酸化物（ＮＯｘ）等の有害成分を浄化する排
気浄化装置が知られている。排気浄化触媒は通常、特定
の活性化温度以上にならないと機能せず、その活性化温
度も比較的高温であるため、排気浄化触媒の温度が低い
ときには有害成分を充分に浄化できず、大気中に放出し
てしまうおそれがある。2. Description of the Related Art An exhaust gas purifying catalyst is disposed in an exhaust passage of an internal combustion engine so that hydrocarbons (HC), carbon monoxide (C)
2. Description of the Related Art An exhaust gas purifying apparatus for purifying harmful components such as O) and nitrogen oxides (NOx) is known. Exhaust gas purifying catalysts generally do not function unless they have a specific activation temperature or higher, and their activation temperatures are relatively high. Therefore, when the temperature of the exhaust gas purifying catalyst is low, harmful components cannot be sufficiently purified, and May be released to
【０００３】そこで、触媒の温度が低いときには、低温
で排気中の有害成分を吸着し、高温になると吸着した有
害成分を放出する吸着材を併用することで、排気浄化触
媒の温度が低いときの有害成分の大気中への放出を防止
する技術が知られている。具体的には、吸着材と浄化触
媒を２層化する技術や浄化触媒の上流側に吸着材を配置
する技術が知られている。Therefore, when the temperature of the catalyst is low, a harmful component in the exhaust gas is adsorbed at a low temperature, and an adsorbent that releases the harmful component adsorbed at a high temperature is used in combination, so that the exhaust gas purifying catalyst can be used at a low temperature. Techniques for preventing harmful components from being released into the atmosphere are known. Specifically, a technique of forming the adsorbent and the purification catalyst into two layers and a technique of disposing the adsorbent upstream of the purification catalyst are known.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前述し
たように吸着材による反応は低温で進行するため、熱容
量を大きくとることが有効である一方、浄化触媒は早期
に活性化する必要がある。さらに、低温では、ＨＣが浄
化触媒の活性を阻害することから、従来技術では、浄化
触媒が活性化するのが遅れ、運転開始当初の浄化性能が
十分ではなかった。However, since the reaction by the adsorbent proceeds at a low temperature as described above, it is effective to increase the heat capacity, but it is necessary to activate the purification catalyst at an early stage. Furthermore, at low temperatures, HC inhibits the activity of the purification catalyst, so that the activation of the purification catalyst was delayed in the prior art, and the purification performance at the beginning of operation was not sufficient.
【０００５】本発明は係る問題点に鑑みて、特に運転開
始当初の浄化性能を向上させた排気浄化装置を提供する
ことを課題とする。[0005] In view of the above problems, it is an object of the present invention to provide an exhaust gas purifying apparatus having improved purifying performance especially at the start of operation.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するた
め、本発明に係る排気浄化装置は、排気中の炭化水素を
吸着するＨＣ吸着材と、排気中の少なくとも炭化水素を
反応除去する浄化触媒とを組み合わせた排気浄化装置に
おいて、ＨＣ吸着材を上流側、浄化触媒を下流側に配置
し、排気ガス流路における浄化触媒の断面積をＨＣ吸着
材の断面積より小さく設定していることを特徴とする。In order to solve the above problems, an exhaust gas purifying apparatus according to the present invention comprises an HC adsorbent for adsorbing hydrocarbons in exhaust gas, and a purifying catalyst for reacting and removing at least hydrocarbons in exhaust gas. In the exhaust gas purification apparatus, the HC adsorbent is arranged on the upstream side and the purification catalyst is arranged on the downstream side, and the cross-sectional area of the purifying catalyst in the exhaust gas passage is set smaller than the cross-sectional area of the HC adsorbent. Features.
【０００７】本発明によれば、浄化触媒の断面積をＨＣ
吸着材の断面積より小さくしているので、浄化触媒の単
位体積あたりの排気ガスとの接触面積を増大させること
が可能であり、その結果、排気ガスによって浄化触媒の
昇温と活性化を促進し得る。ここで、浄化触媒、ＨＣ吸
着材の断面積とは、例えば浄化触媒、ＨＣ吸着材がハニ
カム担体に担持されている場合は、ハニカム担体の流路
における断面積を指している。このようにすると、浄化
触媒をＨＣ吸着材と分離して配置するので、二層配置の
場合に比較して浄化触媒の耐久性を確保できる。According to the present invention, the cross-sectional area of the purification catalyst is set to HC
Since it is smaller than the cross-sectional area of the adsorbent, it is possible to increase the contact area with the exhaust gas per unit volume of the purification catalyst, and as a result, the exhaust gas promotes the temperature rise and activation of the purification catalyst I can do it. Here, the cross-sectional area of the purifying catalyst and the HC adsorbent indicates, for example, the cross-sectional area of the channel of the honeycomb carrier when the purifying catalyst and the HC adsorbent are supported on the honeycomb carrier. In this case, since the purification catalyst is arranged separately from the HC adsorbent, the durability of the purification catalyst can be secured as compared with the case of the two-layer arrangement.
【０００８】この浄化触媒の単位体積当たりの熱容量を
ＨＣ吸着材の単位体積あたりの熱容量より小さく設定し
ていることが好ましい。これにより、下流側の浄化触媒
を排ガスで確実に昇温するとともに、浄化触媒が活性化
するまでＨＣ吸着材を有害物質の吸着モードに保持でき
る。It is preferable that the heat capacity per unit volume of the purification catalyst is set smaller than the heat capacity per unit volume of the HC adsorbent. Thereby, the temperature of the purification catalyst on the downstream side can be reliably raised by the exhaust gas, and the HC adsorbent can be held in the harmful substance adsorption mode until the purification catalyst is activated.
【０００９】[0009]
【発明の実施の形態】以下、添付図面を参照して本発明
の好適な実施の形態について詳細に説明する。説明の理
解を容易にするため、各図面において同一の構成要素に
対しては可能な限り同一の参照番号を附し、重複する説
明は省略する。Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements are denoted by the same reference numerals as much as possible in each drawing, and redundant description will be omitted.
【００１０】図１は、本発明に係る排気浄化装置１の概
略構成図である。内燃機関に接続される上流側にＨＣ吸
着部１０を、その下流に三元触媒部２０を有する直列構
成となっている。FIG. 1 is a schematic configuration diagram of an exhaust gas purifying apparatus 1 according to the present invention. An HC adsorbing section 10 is provided on the upstream side connected to the internal combustion engine, and a three-way catalyst section 20 is provided on the downstream side thereof in series.
【００１１】図２、図３は、ＨＣ吸着部１０、三元触媒
部２０それぞれの内部構成を示す拡大断面図である。図
２に示されるように、ＨＣ吸着部１０は、ハニカム担体
１１の各内壁部分にＨＣ吸着材１２がコーティングされ
ている。ＨＣ吸着材１２としては、ＺＳＭ−５型、Ｙ
型、β型等のゼオライト系ＨＣ吸着材を好適に用いるこ
とができる。ＨＣ吸着材１２としてはＨ2Ｏ吸着性能を
有しているとさらに好ましい。FIGS. 2 and 3 are enlarged sectional views showing the internal structure of the HC adsorbing section 10 and the three-way catalyst section 20, respectively. As shown in FIG. 2, in the HC adsorbing section 10, each inner wall portion of the honeycomb carrier 11 is coated with an HC adsorbing material 12. As the HC adsorbent 12, ZSM-5 type, Y
And β-type zeolite-based HC adsorbents can be suitably used. It is more preferable that the HC adsorbent 12 has H 2 O adsorption performance.
【００１２】図３に示されるように、三元触媒部２０も
ＨＣ吸着部１０とほぼ同様の構成を有しており、ハニカ
ム担体２１の各内壁部分に三元触媒２２がコーティング
されている。三元触媒２２は、Ｐｔ、Ｒｈ、Ｐｄのうち
の少なくとも一種の貴金属と多孔質アルミナ、チタニ
ア、ジルコニアのうちの少なくとも一種の酸化物と酸化
セリウムから構成されていることが好ましい。As shown in FIG. 3, the three-way catalyst section 20 has substantially the same structure as the HC adsorbing section 10, and the inner wall of the honeycomb carrier 21 is coated with the three-way catalyst 22. The three-way catalyst 22 is preferably composed of at least one noble metal of Pt, Rh, and Pd, at least one oxide of porous alumina, titania, and zirconia, and cerium oxide.
【００１３】この排気浄化装置１では、三元触媒部２０
の排気ガス流路中に占める断面積Ｓ２、つまり、排気ガ
ス流路におけるハニカム担体２１と三元触媒２２の断面
積の和、がＨＣ吸着部１０の排気ガス流路中に占める断
面積Ｓ１、つまり、排気ガス流路におけるハニカム担体
１１と吸着材１２の断面積の和、より小さくなるよう設
定されている。ハニカム担体１１とハニカム担体２１の
開口率（流路部１３、２３の全体の面積に占める比率）
が同一であれば、図１に示されるようにＨＣ吸着部１０
の外径が三元触媒２０の外径より大きく設定される。In the exhaust gas purifying apparatus 1, the three-way catalyst section 20
, The sum of the cross-sectional areas of the honeycomb carrier 21 and the three-way catalyst 22 in the exhaust gas flow path, the cross-sectional area S1 occupying the exhaust gas flow path of the HC adsorber 10; That is, the sum of the cross-sectional areas of the honeycomb carrier 11 and the adsorbent 12 in the exhaust gas passage is set to be smaller. Opening ratio of the honeycomb carrier 11 and the honeycomb carrier 21 (ratio of the entire flow passages 13 and 23 to the total area)
Are the same, as shown in FIG.
Is set to be larger than the outer diameter of the three-way catalyst 20.
【００１４】さらに、三元触媒部２０の流路部２３を除
くハニカム担体２１と三元触媒２２部分の単位体積あた
りの熱容量がＨＣ吸着部１０の流路部１３を除くハニカ
ム担体１１とＨＣ吸着材１２部分の単位体積あたりの熱
容量より小さいことが好ましい。Further, the heat capacity per unit volume of the honeycomb carrier 21 and the three-way catalyst 22 except for the flow path portion 23 of the three-way catalyst section 20 is equal to that of the honeycomb carrier 11 and the HC adsorption except for the flow path section 13 of the HC adsorption section 10. It is preferable that the heat capacity per unit volume of the material 12 is smaller.
【００１５】本発明に係る排気浄化装置１においては、
三元触媒部２０が低温で活性化してない間は、排気ガス
中のＨＣ成分は前段のＨＣ吸着部１０のＨＣ吸着材１２
に吸着されるので、大気中への放出が抑制される。そし
て、前述したように、前段のＨＣ吸着部１０の断面積よ
り後段の三元触媒部２０の断面積を小さくすることで、
高温の排気ガスと三元触媒部２０の構成要素との接触面
積を増大させて熱伝達を促進し、三元触媒部２０の昇温
を促進し、早期活性化を実現できる。ＨＣ吸着部１０が
排気ガスによって加熱され、温度が上がると、ＨＣ吸着
材１２は吸着していたＨＣ成分を放出するが、後段の三
元触媒部２０の三元触媒２２が活性化されているので、
ＨＣ成分を酸化反応により分解除去することができる。
したがって、運転開始当初の排出性能を向上させること
ができる。In the exhaust gas purifying apparatus 1 according to the present invention,
While the three-way catalyst unit 20 is not activated at a low temperature, the HC component in the exhaust gas is reduced by the HC adsorbent 12 of the preceding HC adsorbing unit 10.
, So emission into the atmosphere is suppressed. Then, as described above, by making the cross-sectional area of the subsequent three-way catalyst unit 20 smaller than the cross-sectional area of the preceding HC adsorption unit 10,
By increasing the contact area between the high-temperature exhaust gas and the components of the three-way catalyst section 20, heat transfer is promoted, the temperature of the three-way catalyst section 20 is increased, and early activation can be realized. When the HC adsorbing section 10 is heated by the exhaust gas and the temperature rises, the HC adsorbing material 12 releases the adsorbed HC component, but the three-way catalyst 22 of the subsequent three-way catalyst section 20 is activated. So
HC components can be decomposed and removed by an oxidation reaction.
Therefore, the discharge performance at the beginning of operation can be improved.
【００１６】本願発明者は、本発明に係る排気浄化装置
の排出性能の向上効果を確認する比較実験を行ったの
で、以下、その比較実験結果について説明する。The inventor of the present application has conducted a comparative experiment to confirm the effect of improving the exhaust performance of the exhaust gas purifying apparatus according to the present invention. The result of the comparative experiment will be described below.
【００１７】比較実験においては、ハニカム担体１１、
２１としていずれも１ｃｍ2あたり６２セル（１ｉｎ2あ
たり４００セル）のセルを有するハニカム担体を用い
た。そして、上流側のＨＣ吸着部１０と下流側の三元触
媒部２０の容量はそれぞれ１．３リットルと０．９リッ
トルとした。ＨＣ吸着材１２には、ＺＳＭ−５型とＹ型
のゼオライトを重量比３：１で混合した吸着材を用い
た。そして、三元触媒２２には、三元触媒部２０の容量
１リットル当たり５ｇのＰｄと１ｇのＲｈを、アルミナ
とセリアを３：２の重量比で混合したコート材により担
持させた。そして、上流側のＨＣ吸着部１０と下流側の
三元触媒部２０の断面積、容量を変えてその排出性能を
評価した。本発明に係る排気浄化装置に該当する実施例
１〜４と、比較のために下段の断面積を上段の断面積と
同じか大きくした比較例１、２の排気浄化装置の諸元を
表１にまとめて示す。In the comparative experiment, the honeycomb carrier 11,
As 21, a honeycomb carrier having 62 cells per 1 cm 2 (400 cells per 1 in 2 ) was used. The capacities of the upstream HC adsorption section 10 and the downstream three-way catalyst section 20 were 1.3 liter and 0.9 liter, respectively. As the HC adsorbent 12, an adsorbent obtained by mixing ZSM-5 type and Y type zeolite at a weight ratio of 3: 1 was used. The three-way catalyst 22 carried 5 g of Pd and 1 g of Rh per liter of the capacity of the three-way catalyst section 20 by a coating material in which alumina and ceria were mixed at a weight ratio of 3: 2. Then, the cross-sectional area and capacity of the upstream HC adsorbing section 10 and the downstream three-way catalyst section 20 were changed to evaluate their discharge performance. Table 1 shows the specifications of the exhaust gas purifying apparatuses of Examples 1 to 4 corresponding to the exhaust gas purifying apparatus according to the present invention and Comparative Examples 1 and 2 in which the lower sectional area is equal to or larger than the upper sectional area for comparison. Are shown together.
【００１８】[0018]
【表１】 [Table 1]
【００１９】排出性能の評価には、排気量２．２リット
ルの直列４気筒エンジンに接続し、ＬＡ＃４モード走行
時のＣｏｌｄバック時（走行開始から５０５秒経過時点
まで）の総ＨＣ排出量で評価した。評価結果を図４にま
とめて示す。In order to evaluate the emission performance, the total HC emission during Cold Back (from the start of running 505 seconds) during the LA # 4 mode running, connected to a 2.2-liter in-line four-cylinder engine, was evaluated. Was evaluated. The evaluation results are shown in FIG.
【００２０】運転開始当初である０〜４５秒におけるＨ
Ｃ排出量は、実施例１〜４がいずれも比較例１、２以下
に抑えられた。そして、４５〜５０５秒におけるＨＣ排
出量は、実施例１〜４がいずれも比較例１、２を下回っ
た。H at 0 to 45 seconds at the beginning of operation
In Examples 1 to 4, the C emission was suppressed to Comparative Examples 1 and 2 or less. In addition, the HC emissions in 45 to 505 seconds were lower in Examples 1 to 4 than in Comparative Examples 1 and 2.
【００２１】これは、触媒温度が低い運転開始当初にお
いては、ＨＣ吸着材１２へのＨＣ成分の吸着が主として
進行するため、実施例１〜４と比較例１の差は小さい。
比較例２の排出性能が劣っているのは、ＨＣ吸着部１０
の昇温が早く、ＨＣの脱離が早くから始まるためと考え
られる。The difference between Examples 1 to 4 and Comparative Example 1 is small because the adsorption of the HC component to the HC adsorbent 12 mainly proceeds at the beginning of operation when the catalyst temperature is low.
The emission performance of Comparative Example 2 was inferior in the HC adsorber 10
It is considered that the temperature of the fuel cell rises quickly, and the desorption of HC starts early.
【００２２】実施例１〜４では、比較例１、２に比べて
三元触媒部２０の昇温が速いため、活性化するのが早
く、この結果、特に４５〜１２５秒におけるＨＣ排出量
を抑制できたものと考えられる。この効果は、三元触媒
部２０の断面積、熱容量とも最も小さくなる実施例４に
おいて顕著であった。これにより、本発明に係る排気浄
化装置の排出性能の向上が確認された。In Examples 1 to 4, the three-way catalyst section 20 was quickly activated since the temperature of the three-way catalyst section 20 was raised faster than in Comparative Examples 1 and 2. As a result, the amount of HC emission in 45 to 125 seconds was reduced. It is considered that the suppression was achieved. This effect was remarkable in Example 4 in which both the cross-sectional area and the heat capacity of the three-way catalyst section 20 were smallest. Thereby, the improvement of the exhaust performance of the exhaust gas purification device according to the present invention was confirmed.
【００２３】上述の実施形態では、ＨＣ吸着部１０と三
元触媒部２０のそれぞれの断面積が排気ガス流動方向に
一定の実施形態について説明してきたが、図５に示され
るように、下流側にいくにしたがって断面積が小さくな
る形状を採用してもよい。この場合は、それぞれの平均
断面積が上記の関係を満たしていればよい。In the above-described embodiment, the embodiment in which the cross-sectional area of each of the HC adsorbing section 10 and the three-way catalyst section 20 is constant in the exhaust gas flow direction has been described. However, as shown in FIG. May be adopted such that the cross-sectional area decreases as the number of times increases. In this case, it is sufficient that the respective average cross-sectional areas satisfy the above relation.
【００２４】[0024]
【発明の効果】以上説明したように本発明によれば、下
流側に設置する三元触媒の断面積を上流側に設置するＨ
Ｃ吸着材の断面積より小さくすることで、三元触媒の昇
温促進による早期活性化とＨＣ吸着材の昇温抑制による
脱離の抑制を同時に実現でき、触媒温度が低い運転当初
の排出性能を向上させることができる。As described above, according to the present invention, the cross-sectional area of the three-way catalyst installed on the downstream side is reduced by the H
By making the cross-sectional area smaller than that of the C adsorbent, early activation by accelerating the temperature rise of the three-way catalyst and suppression of desorption by suppressing the temperature rise of the HC adsorbent can be realized at the same time. Can be improved.
【図１】本発明に係る排気浄化装置の概略構成図であ
る。FIG. 1 is a schematic configuration diagram of an exhaust gas purification device according to the present invention.
【図２】図１の装置のＨＣ吸着部の拡大断面図である。FIG. 2 is an enlarged sectional view of an HC adsorbing section of the apparatus of FIG.
【図３】図１の装置の三元触媒部の拡大断面図である。FIG. 3 is an enlarged sectional view of a three-way catalyst section of the apparatus of FIG.
【図４】比較実験結果を示す図である。FIG. 4 is a diagram showing the results of a comparative experiment.
【図５】本発明に係る排気浄化装置の別の実施形態の概
略構成図である。FIG. 5 is a schematic configuration diagram of another embodiment of the exhaust gas purification device according to the present invention.
１…排気浄化装置、１０…ＨＣ吸着部、２０…三元触媒
部、１１、２１…ハニカム担体、１２…ＨＣ吸着材、２
２…三元触媒、１３、２３…流路部。DESCRIPTION OF SYMBOLS 1 ... Exhaust gas purification apparatus, 10 ... HC adsorption part, 20 ... Three-way catalyst part, 11, 21 ... Honeycomb carrier, 12 ... HC adsorbent, 2
2 ... three-way catalyst, 13, 23 ... flow path section.
フロントページの続き Ｆターム(参考） 3G091 AA02 AA28 AB03 AB10 BA03 BA14 BA15 BA19 BA25 FA02 FA04 FA12 FA13 FB02 FC07 GA06 GA19 GB01W GB01X GB04W GB05W GB06W GB07W GB09Y GB10W GB10X GB17X HA20 HA47 HB01 Continued on the front page F term (reference) 3G091 AA02 AA28 AB03 AB10 BA03 BA14 BA15 BA19 BA25 FA02 FA04 FA12 FA13 FB02 FC07 GA06 GA19 GB01W GB01X GB04W GB05W GB06W GB07W GB09Y GB10W GB10X GB17X HA20 HA47 HB01
Claims (2)
と、排気中の少なくとも炭化水素を反応除去する浄化触
媒とを組み合わせた排気浄化装置において、 前記ＨＣ吸着材を上流側、前記浄化触媒を下流側に配置
し、排気ガス流路における前記浄化触媒の断面積を前記
ＨＣ吸着材の断面積より小さく設定していることを特徴
とする排気浄化装置。1. An exhaust gas purifying apparatus which combines an HC adsorbent for adsorbing hydrocarbons in exhaust gas and a purifying catalyst for reacting and removing at least hydrocarbons in exhaust gas, wherein the HC adsorbing material is located upstream and the purifying catalyst is used. An exhaust gas purification apparatus, wherein a cross-sectional area of the purifying catalyst in an exhaust gas passage is set smaller than a cross-sectional area of the HC adsorbent.
を前記ＨＣ吸着材の単位体積あたりの熱容量より小さく
設定していることを特徴とする請求項１記載の排気浄化
装置。2. The exhaust gas purification apparatus according to claim 1, wherein a heat capacity per unit volume of the purification catalyst is set smaller than a heat capacity per unit volume of the HC adsorbent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29527599A JP2001115832A (en) | 1999-10-18 | 1999-10-18 | Exhaust gas purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29527599A JP2001115832A (en) | 1999-10-18 | 1999-10-18 | Exhaust gas purification device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001115832A true JP2001115832A (en) | 2001-04-24 |
Family
ID=17818500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29527599A Withdrawn JP2001115832A (en) | 1999-10-18 | 1999-10-18 | Exhaust gas purification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001115832A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012013059A (en) * | 2010-07-05 | 2012-01-19 | Mitsubishi Motors Corp | Exhaust gas cleaning device |
| JP2013034985A (en) * | 2011-01-24 | 2013-02-21 | Nissan Motor Co Ltd | Exhaust gas cleaning system |
| WO2015151736A1 (en) * | 2014-04-04 | 2015-10-08 | 日産自動車株式会社 | Engine exhaust apparatus |
| KR20190062706A (en) * | 2017-11-29 | 2019-06-07 | 에이치에스디엔진 주식회사 | Selective catalytic reduction system |
-
1999
- 1999-10-18 JP JP29527599A patent/JP2001115832A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012013059A (en) * | 2010-07-05 | 2012-01-19 | Mitsubishi Motors Corp | Exhaust gas cleaning device |
| JP2013034985A (en) * | 2011-01-24 | 2013-02-21 | Nissan Motor Co Ltd | Exhaust gas cleaning system |
| WO2015151736A1 (en) * | 2014-04-04 | 2015-10-08 | 日産自動車株式会社 | Engine exhaust apparatus |
| JPWO2015151736A1 (en) * | 2014-04-04 | 2017-04-13 | 日産自動車株式会社 | Engine exhaust system |
| KR20190062706A (en) * | 2017-11-29 | 2019-06-07 | 에이치에스디엔진 주식회사 | Selective catalytic reduction system |
| KR102402306B1 (en) | 2017-11-29 | 2022-05-27 | 에이치에스디엔진 주식회사 | Selective catalytic reduction system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3311051B2 (en) | Exhaust gas purification method and apparatus | |
| JP5607042B2 (en) | Lean burn IC engine exhaust system | |
| US6391822B1 (en) | Dual NOx adsorber catalyst system | |
| CN101365867A (en) | Exhaust System Including Zoned Oxidation Catalyst | |
| KR100731257B1 (en) | Exhaust gas purifying catalyst and process for purifying exhaust gas | |
| JPH11267504A (en) | Catalyst for cleaning exhaust gas and exhaust gas cleaning system using it | |
| JP3282344B2 (en) | Exhaust gas purification device | |
| JP2003201832A (en) | Exhaust emission control catalyst system | |
| US6171557B1 (en) | System for exhaust gas purification | |
| JP2001115832A (en) | Exhaust gas purification device | |
| JP2004275814A (en) | Exhaust gas purifying catalyst, its manufacturing method and exhaust gas purifying apparatus | |
| US6447735B1 (en) | Exhaust purifier and manufacturing method of same | |
| JPH11324662A (en) | Catalyst converter device | |
| JP3736373B2 (en) | Engine exhaust purification system | |
| JP4058588B2 (en) | Exhaust gas purification catalyst | |
| JP4006061B2 (en) | Exhaust gas purification system | |
| JP3419310B2 (en) | Exhaust gas purification device for internal combustion engine | |
| JP4770132B2 (en) | HC adsorption catalyst and exhaust gas purification apparatus using the same | |
| JP2005144294A (en) | Catalyst for purifying exhaust gas | |
| JP3757440B2 (en) | Engine exhaust gas purification device | |
| JP2002263450A (en) | Exhaust gas purification device | |
| JP2002239346A (en) | Method and apparatus for cleaning exhaust gas | |
| JP2004089881A (en) | Exhaust gas purification equipment | |
| EP1262642B1 (en) | Exhaust gas purifying system | |
| JP2003200063A (en) | Catalyst for exhaust gas purification, method for manufacturing the same and exhaust gas purification system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20040120 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040121 |