JP2007160188A - Hc trapping catalyst - Google Patents

Hc trapping catalyst Download PDF

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JP2007160188A
JP2007160188A JP2005358428A JP2005358428A JP2007160188A JP 2007160188 A JP2007160188 A JP 2007160188A JP 2005358428 A JP2005358428 A JP 2005358428A JP 2005358428 A JP2005358428 A JP 2005358428A JP 2007160188 A JP2007160188 A JP 2007160188A
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JP4872334B2 (en
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Takahisa Nagao
貴久 長尾
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Mitsubishi Motors Corp
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<P>PROBLEM TO BE SOLVED: To provide a hydrocarbon (HC) trapping catalyst which enables an improvement in the HC purifying efficiency by increasing the thickness of the adsorption layer partially to retard the HC-detaching timing partially in order to carry out discharge of HCs uniformly in a specified period. <P>SOLUTION: The HC trapping catalyst keeps a carrier 1 having a polygonal cross-section of the cell overlaid with an adsorption layer 2 carrying an adsorbent which has a hydrocarbon adsorbing function and a catalyst layer 3 carrying a catalyst which is arranged in the upper layer of the adsorption layer 2 and has the function of purifying harmful ingredients in exhaust gas. The adsorption layer 2 has the maximum thickness, a+c, on the segment lines drawn between corners 1a, 1b, 1c and 1d and the center of gravity, G1, of the cross-section of the cell. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ＨＣトラップ触媒に関する。   The present invention relates to an HC trap catalyst.

車両等から排出される排ガスには、炭化水素（ＨＣ）、一酸化炭素（ＣＯ）、窒素酸化物（ＮＯｘ）といった有害成分が含まれており、近年、これら有害成分に対する排出量の規制が行われている。車両から排出される排ガスを浄化する方法としては、空燃比を理論空燃比として、三元触媒で酸化還元する方法が一般的である。   Exhaust gas discharged from vehicles and the like contains harmful components such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). In recent years, the emission of these harmful components has been regulated. It has been broken. As a method of purifying exhaust gas discharged from a vehicle, a method of oxidizing and reducing with a three-way catalyst with an air-fuel ratio as a theoretical air-fuel ratio is common.

ところが、機関始動時、特に冷態始動時においては、燃料の気化が悪いために理論空燃比よりも多めに燃料を供給している。しかし、三元触媒はその触媒作用を発揮する所定温度以上には昇温されていない。即ち、機関始動時から暖機終了までの間には未燃のＨＣが多量に大気中に放出されることになる。ＨＣは光化学スモッグ（オキシダント）生成の原因となるため、今後規制が厳しくなる傾向にあり、これにより、特に機関始動時において車両から多量に排出されるＨＣを浄化するＨＣトラップ触媒が種々提供されている。   However, at the time of engine start, particularly at the time of cold start, the fuel is poorly vaporized, so that more fuel is supplied than the stoichiometric air-fuel ratio. However, the temperature of the three-way catalyst is not raised above a predetermined temperature at which the catalytic action is exhibited. That is, a large amount of unburned HC is released into the atmosphere from the time of engine start to the end of warm-up. Since HC causes photochemical smog (oxidant) generation, regulations tend to be stricter in the future, and various HC trap catalysts for purifying HC discharged in large quantities from vehicles, especially when starting an engine, are provided. Yes.

図９は従来のＨＣトラップ触媒の吸着層及び触媒層の形状を示したものであり、炭化水素吸着機能を有する吸着層１０２と、暖機と共に吸着層１０２から脱離してきたＨＣを昇温して浄化する触媒層１０３とが担体１上に形成されており、その中央部に排ガス通路１０４が形成されている。従って、機関始動時から触媒層１０３が昇温（活性化）するまでに排出されるＨＣを吸着層１０２に一時的に吸着させ、次いで、吸着したＨＣが排ガスにより昇温した触媒層１０３に脱離した後、この触媒層１０３において脱離したＨＣを浄化することにより、特に、機関始動時に多量に発生するＨＣを効率的に浄化することができる。   FIG. 9 shows the shape of the adsorption layer and the catalyst layer of a conventional HC trap catalyst. The temperature of the adsorption layer 102 having a hydrocarbon adsorption function and the HC desorbed from the adsorption layer 102 with warm-up are increased. A catalyst layer 103 to be purified is formed on the carrier 1, and an exhaust gas passage 104 is formed at the center thereof. Accordingly, the HC discharged from the start of the engine until the catalyst layer 103 is heated (activated) is temporarily adsorbed by the adsorption layer 102, and then the adsorbed HC is desorbed by the catalyst layer 103 heated by the exhaust gas. After separation, the HC desorbed in the catalyst layer 103 is purified, and in particular, a large amount of HC generated when the engine is started can be efficiently purified.

このような、従来のＨＣトラップ触媒は、例えば、特許文献１，２に開示されている。   Such conventional HC trap catalysts are disclosed in, for example, Patent Documents 1 and 2.

特開平１１−１０４４６２号公報JP-A-11-104462 特許第３４８９０４９号公報Japanese Patent No. 3489049

しかしながら、従来のＨＣトラップ触媒においては、吸着層や触媒層の厚さを規定することによりＨＣ浄化性能の向上を図ろうとしているが、従来の吸着層及び触媒層の形成方法では、触媒層が活性化する前にＨＣが脱離し、ＨＣが浄化されないまま、排出されるおそれがあった。即ち、特許文献１では吸着層及び触媒層の厚さを平均して形成させており、特許文献２ではセル断面の重心からの距離に応じて吸着層及び触媒層を形成させているが、このような形成方法では、ＨＣの脱離及び排出が一時的に大量に行われることになり、必ずしも浄化が効率的に行われるとは限らない。よって、従来のＨＣトラップ触媒によるＨＣ浄化性能の向上を図るという技術においては、まだ改善の余地があると考えられる。   However, the conventional HC trap catalyst attempts to improve the HC purification performance by defining the thickness of the adsorption layer and the catalyst layer. However, in the conventional method for forming the adsorption layer and the catalyst layer, the catalyst layer is There was a possibility that HC was desorbed before being activated and discharged without being purified. That is, in Patent Document 1, the thicknesses of the adsorption layer and the catalyst layer are averaged, and in Patent Document 2, the adsorption layer and the catalyst layer are formed according to the distance from the center of gravity of the cell cross section. In such a forming method, desorption and discharge of HC are temporarily performed in large quantities, and purification is not always performed efficiently. Therefore, it is considered that there is still room for improvement in the technology for improving the HC purification performance by the conventional HC trap catalyst.

従って、本発明は上記課題を解決するものであって、部分的に吸着層を厚くし、ＨＣの脱離タイミングを部分的に遅らせて、その間に触媒層を活性化させることにより、ＨＣ浄化効率を向上させることができるＨＣトラップ触媒を提供することを目的とする。   Accordingly, the present invention solves the above-mentioned problem, and by partially thickening the adsorption layer, partially delaying the HC desorption timing, and activating the catalyst layer during that time, the HC purification efficiency An object of the present invention is to provide an HC trap catalyst capable of improving the catalyst.

上記課題を解決する第１の発明に係るＨＣトラップ触媒は、
セル断面が多角形からなる担体上に、
炭化水素吸着機能を有する吸着材が担持される吸着層と、
前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、
前記セル断面内で、前記吸着層で囲まれる領域の断面に前記セル断面内側に向かう凸部が形成され、
該凸部は前記セル断面の角部に対向して設けられる
ことを特徴とする。 The HC trap catalyst according to the first invention for solving the above-mentioned problems is
On a carrier whose cell cross section is a polygon,
An adsorption layer on which an adsorbent having a hydrocarbon adsorption function is supported;
An HC trap catalyst, which is provided in the upper layer of the adsorption layer and forms a catalyst layer on which a catalyst having a function of purifying harmful components in exhaust gas is supported,
Within the cell cross-section, a convex portion is formed on the cross-section of the region surrounded by the adsorption layer toward the cell cross-section inner side,
The convex portion is provided to face a corner portion of the cell cross section.

上記課題を解決する第２の発明に係るＨＣトラップ触媒は、
セル断面が多角形からなる担体上に、
炭化水素吸着機能を有する吸着材が担持される吸着層と、
前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、
前記セル断面内で、前記吸着層で囲まれる領域の断面が多角形に形成され、
該吸着層で囲まれる領域の断面の辺部は前記セル断面の角部に対向して設けられる
ことを特徴とする。 The HC trap catalyst according to the second invention for solving the above-mentioned problem is
On a carrier whose cell cross section is a polygon,
An adsorption layer on which an adsorbent having a hydrocarbon adsorption function is supported;
An HC trap catalyst, which is provided in the upper layer of the adsorption layer and forms a catalyst layer on which a catalyst having a function of purifying harmful components in exhaust gas is supported,
Within the cell cross section, the cross section of the region surrounded by the adsorption layer is formed in a polygon,
A side portion of a cross section of the region surrounded by the adsorption layer is provided to face a corner portion of the cell cross section.

上記課題を解決する第３の発明に係るＨＣトラップ触媒は、
第１または２の発明に係るＨＣトラップ触媒において、
前記セル断面の少なくとも１つの角部から前記セル断面の重心に向かう前記吸着層の厚さが最大になるように形成される
ことを特徴とする。 The HC trap catalyst according to the third invention for solving the above-mentioned problems is
In the HC trap catalyst according to the first or second invention,
The adsorption layer is formed to have a maximum thickness from at least one corner of the cell cross section toward the center of gravity of the cell cross section.

上記課題を解決する第４の発明に係るＨＣトラップ触媒は、
第１乃至３のいずれかの発明に係るＨＣトラップ触媒において、
前記触媒層を前記セル断面の辺部に内接させる
ことを特徴とする。 The HC trap catalyst according to a fourth invention for solving the above-mentioned problem is
In the HC trap catalyst according to any one of the first to third inventions,
The catalyst layer is inscribed in a side portion of the cell cross section.

第１の発明に係るＨＣトラップ触媒によれば、セル断面が多角形からなる担体上に、炭化水素吸着機能を有する吸着材が担持される吸着層と、前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、前記セル断面内で、前記吸着層で囲まれる領域の断面に前記セル断面内側に向かう凸部を形成し、該凸部を前記セル断面の角部に対向して設けることにより、部分的に前記吸着層の厚さを厚くし、炭化水素の脱離タイミングを部分的に遅らせて、その間に前記触媒層を活性化させることができるので、ＨＣ浄化効率を向上させることができる。   According to the HC trap catalyst of the first invention, an adsorption layer in which an adsorbent having a hydrocarbon adsorption function is supported on a support having a polygonal cell cross section, and an upper layer of the adsorption layer, An HC trap catalyst formed with a catalyst layer on which a catalyst having a function of purifying harmful components therein is supported, wherein a section of a region surrounded by the adsorption layer in the cell cross section protrudes toward the inside of the cell cross section. Forming a convex portion and providing the convex portion facing the corner of the cell cross section, partially increasing the thickness of the adsorption layer and partially delaying the hydrocarbon desorption timing, In addition, since the catalyst layer can be activated, the HC purification efficiency can be improved.

第２の発明に係るＨＣトラップ触媒によれば、セル断面が多角形からなる担体上に、炭化水素吸着機能を有する吸着材が担持される吸着層と、前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、前記セル断面内で、前記吸着層で囲まれる領域の断面を多角形に形成し、該吸着層で囲まれる領域の断面の辺部を前記セル断面の角部に対向して設けることにより、ＨＣトラップ触媒による圧力損失を増大させることなく、部分的に前記吸着層を厚くし、炭化水素の脱離タイミングを部分的に遅らせて、その間に前記触媒層を活性化させることができるので、ＨＣ浄化効率を向上させることができる。   According to the HC trap catalyst of the second invention, an adsorption layer in which an adsorbent having a hydrocarbon adsorption function is supported on a carrier having a polygonal cell cross section, and an upper layer of the adsorption layer are provided. An HC trap catalyst in which a catalyst layer carrying a catalyst having a function of purifying harmful components therein is formed, wherein a cross section of a region surrounded by the adsorption layer is formed in a polygon in the cell cross section, By providing the side of the cross section of the region surrounded by the adsorption layer so as to face the corner of the cell cross section, the adsorption layer is partially thickened without increasing the pressure loss due to the HC trap catalyst, Since the catalyst layer can be activated in the meantime by partially delaying the desorption timing of HC, the HC purification efficiency can be improved.

第３の発明に係るＨＣトラップ触媒によれば、第１または２の発明に係るＨＣトラップ触媒において、前記セル断面の少なくとも１つの角部から前記セル断面の重心に向かう前記吸着層の厚さを最大になるように形成することにより、前記触媒層が十分に昇温されるまでの時間中、炭化水素を前記吸着層内に溜めておくことができ、炭化水素の脱離タイミングを部分的に遅らせて、その間に前記触媒層を活性化させることができるので、ＨＣ浄化効率を向上させることができる。   According to the HC trap catalyst according to the third invention, in the HC trap catalyst according to the first or second invention, the thickness of the adsorption layer from at least one corner of the cell cross section toward the center of gravity of the cell cross section is set. By forming it so as to be maximum, hydrocarbons can be stored in the adsorption layer until the catalyst layer is sufficiently heated, and the hydrocarbon desorption timing is partially set. Since the catalyst layer can be activated in the meantime, the HC purification efficiency can be improved.

第４の発明に係るＨＣトラップ触媒によれば、第１乃至３のいずれかの発明に係るＨＣトラップ触媒において、前記触媒層を前記セル断面の辺部に内接させることにより、部分的に前記吸着層の厚さを厚くし、炭化水素の脱離タイミングを部分的に遅らせて、その間に前記触媒層を活性化させることができるので、ＨＣ浄化効率を向上させることができる。   According to the HC trap catalyst according to a fourth aspect of the present invention, in the HC trap catalyst according to any one of the first to third aspects, the catalyst layer is inscribed in a side portion of the cell cross section, thereby partially By increasing the thickness of the adsorption layer and partially delaying the hydrocarbon desorption timing and activating the catalyst layer during that time, the HC purification efficiency can be improved.

以下、本発明に係るＨＣトラップ触媒を図面を用いて詳細に説明する。図１は本発明の一実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図２はＨＣの脱離時間と脱離量との関係を示した図、図３は吸着層の最大吸着層厚さとＨＣ浄化効率との関係を示した図、図４は本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図５は本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図６は本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図７は本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図８は本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図、図９は従来のＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。なお、図１，４，５，６に示す点線は図９に示す吸着層の厚さｂを表している。   Hereinafter, the HC trap catalyst according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing the shapes of an adsorption layer and a catalyst layer of an HC trap catalyst according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between HC desorption time and desorption amount, and FIG. FIG. 4 is a diagram showing the relationship between the maximum adsorption layer thickness of the adsorption layer and the HC purification efficiency, FIG. 4 is a diagram showing the shape of the adsorption layer and the catalyst layer of the HC trap catalyst according to another embodiment of the present invention, and FIG. FIG. 6 shows the shape of the adsorption layer and catalyst layer of the HC trap catalyst according to another embodiment of the present invention, and FIG. 6 shows the shape of the adsorption layer and catalyst layer of the HC trap catalyst according to another embodiment of the present invention. FIG. 7 is a view showing the shape of an adsorption layer and a catalyst layer of an HC trap catalyst according to another embodiment of the present invention. FIG. 8 is an adsorption layer of an HC trap catalyst according to another embodiment of the present invention. FIG. 9 is a diagram showing the shape of the catalyst layer, and FIG. 9 is a diagram showing the shape of the adsorption layer and catalyst layer of the conventional HC trap catalyst. . In addition, the dotted line shown in FIG.1, 4,5,6 represents the thickness b of the adsorption layer shown in FIG.

図１に示すように、本発明に係るＨＣトラップ触媒は、セル断面が略正四角形からなる担体１上に、炭化水素吸着機能を有する吸着材を担持させて吸着層２を形成した後、更に、吸着層２の上層に、排ガス中の有害成分の浄化機能を有する触媒を担持させて触媒層３を形成したものである。   As shown in FIG. 1, the HC trap catalyst according to the present invention forms an adsorbing layer 2 by supporting an adsorbent having a hydrocarbon adsorbing function on a carrier 1 having a substantially square cross section. The catalyst layer 3 is formed by supporting a catalyst having a function of purifying harmful components in the exhaust gas on the upper layer of the adsorption layer 2.

吸着層２は、断面形状が略正四角形のセルに対して、セル各辺の中央部に角部が内接する略正四角形の空洞を開口するように形成されている。触媒層３は、この吸着層２の表面に所定の厚さにより形成されている。そして、触媒層３を形成した残りの空洞が排ガス通路４となる。つまり、吸着層２及び触媒層３の表面と、排ガス通路４の各辺とは、セル断面の角部１ａ，１ｂ，１ｃ，１ｄに対向して設けられており、また、セル各辺の中央部には、触媒層３だけが接している。   The adsorption layer 2 is formed so as to open a substantially square-shaped cavity whose corner is inscribed in the center of each side of a cell having a substantially square shape in cross section. The catalyst layer 3 is formed on the surface of the adsorption layer 2 with a predetermined thickness. The remaining cavity in which the catalyst layer 3 is formed becomes the exhaust gas passage 4. That is, the surfaces of the adsorption layer 2 and the catalyst layer 3 and each side of the exhaust gas passage 4 are provided to face the corners 1a, 1b, 1c, and 1d of the cell cross section, and the center of each side of the cell. Only the catalyst layer 3 is in contact with the portion.

従って、吸着層２、触媒層３及び排ガス通路４がこのような形状をなすことにより、排ガスが排ガス通路４を通過すると、触媒層３が昇温（活性化）するまでに排出される炭化水素（以下、ＨＣと記す）を吸着層２に一時的に吸着させ、次いで、吸着したＨＣが排ガスにより昇温した触媒層３に脱離した後、この触媒層３においてＨＣを浄化して排出することができる。つまり、吸着層２を従来よりも厚く形成することによって、ＨＣを吸着層２の奥まで浸透させることができ、触媒層３が十分に昇温するまでの間、ＨＣを吸着層２に溜めておくことができる。   Therefore, when the adsorbing layer 2, the catalyst layer 3 and the exhaust gas passage 4 have such a shape, when the exhaust gas passes through the exhaust gas passage 4, the hydrocarbons discharged before the catalyst layer 3 is heated (activated). (Hereinafter referred to as HC) is temporarily adsorbed to the adsorption layer 2, and then the adsorbed HC is desorbed to the catalyst layer 3 heated by the exhaust gas, and then the HC is purified and discharged in the catalyst layer 3. be able to. That is, by forming the adsorbing layer 2 thicker than before, HC can be penetrated deep into the adsorbing layer 2, and the HC is accumulated in the adsorbing layer 2 until the catalyst layer 3 is sufficiently heated. I can leave.

次に、本発明に係るＨＣトラップ触媒の吸着層２及び触媒層３の形成方法について説明する。本発明に係るＨＣトラップ触媒の吸着層２及び触媒層３の形状は、図９に示す従来のＨＣトラップ触媒と同一セル構造、即ち、同一セル断面積からなるものであり、更には、従来ものと吸着材の担持量を変えない、即ち、同一排ガス通路断面積からなるものであり、従来のＨＣトラップ触媒の圧力損失を変えることなく、吸着層の形状を変えることにより、ＨＣ浄化性能を向上させるものである。   Next, a method for forming the adsorption layer 2 and the catalyst layer 3 of the HC trap catalyst according to the present invention will be described. The shapes of the adsorption layer 2 and the catalyst layer 3 of the HC trap catalyst according to the present invention are the same cell structure as that of the conventional HC trap catalyst shown in FIG. HC purification performance is improved by changing the shape of the adsorption layer without changing the pressure loss of the conventional HC trap catalyst. It is something to be made.

先ず、図９に示す従来のＨＣトラップ触媒の吸着層１０２は、セルに対して、セル各辺の中央部から厚さがｂになるような空洞を開口するように形成されている。また、角部１ａ，１ｂ，１ｃ，１ｄとセル断面の重心Ｇ１とを結ぶ直線上において、角部１ａ，１ｂ，１ｃ，１ｄから吸着層１０２の表面までの厚さ（ａ＋ｂ）が吸着層１０２の最大厚さとなるように形成されている。   First, the adsorption layer 102 of the conventional HC trap catalyst shown in FIG. 9 is formed so as to open a cavity having a thickness of b from the center of each side of the cell. The thickness (a + b) from the corners 1a, 1b, 1c, 1d to the surface of the adsorption layer 102 on the straight line connecting the corners 1a, 1b, 1c, 1d and the center of gravity G1 of the cell cross section is the adsorption layer 102. It is formed so as to have a maximum thickness.

そして、上述した従来のＨＣトラップ触媒の吸着層の形状に基づいて、本発明のＨＣトラップ触媒の吸着層を形成させるには、図１に示すように、セル各辺の中央部に内接する厚さｂをゼロにし、その分の吸着材を厚さ（ａ＋ｂ）よりも厚くなるように吸着層２の表面に担持させる。即ち、角部１ａ，１ｂ，１ｃ，１ｄとセル断面の重心Ｇ１とを結ぶ直線が交差する吸着層２の表面近傍に担持させることにより、吸着層２の最大厚さが（ａ＋ｃ）となる。このとき、厚さｃは厚さｂよりも厚くなる。これにより、吸着層２は、断面形状が略正四角形のセルに対して、セル各辺の中央部に角部が内接する略正四角形の空洞を開口するように形成されることになり、角部１ａ，１ｂ，１ｃ，１ｄとセル断面の重心Ｇ１とを結ぶ直線上において、最大厚さ（ａ＋ｃ）が形成されることになる。   Then, in order to form the adsorption layer of the HC trap catalyst of the present invention based on the shape of the adsorption layer of the conventional HC trap catalyst described above, as shown in FIG. 1, the thickness inscribed in the central part of each side of the cell The thickness b is set to zero, and the adsorbent is supported on the surface of the adsorption layer 2 so as to be thicker than the thickness (a + b). That is, the maximum thickness of the adsorbing layer 2 becomes (a + c) by supporting the adsorbing layer 2 near the surface where the straight line connecting the corners 1a, 1b, 1c, 1d and the center of gravity G1 of the cell cross section intersects. At this time, the thickness c is thicker than the thickness b. Thereby, the adsorption layer 2 is formed so as to open a substantially square-shaped cavity whose corner is inscribed in the center of each side of the cell with respect to the cell having a substantially square shape in cross section. The maximum thickness (a + c) is formed on a straight line connecting the parts 1a, 1b, 1c, 1d and the center of gravity G1 of the cell cross section.

また、本発明のＨＣトラップ触媒の吸着層の形状においては、吸着材の担持量を変えずに吸着層の形状を変えて部分的に吸着層の厚さを厚くことにより、円形の排ガス通路１０４から正四角形の排ガス通路４に形成させることができるので、従来の排ガス通路１０４の開口断面積に比べて、排ガス通路４の開口断面積は変わらないものの、周長を長くする、即ち、触媒層３の表面積を大きくすることができる。つまり、圧力損失を低下させることなく、排ガスとの接触面積を増やすことができる。   Further, in the shape of the adsorption layer of the HC trap catalyst of the present invention, the circular exhaust gas passage 104 is obtained by changing the shape of the adsorption layer without changing the amount of adsorbent supported and partially increasing the thickness of the adsorption layer. Since the exhaust gas passage 4 does not change in opening cross-sectional area compared to the conventional exhaust gas passage 104, the perimeter of the exhaust gas passage 4 is increased. The surface area of 3 can be increased. That is, the contact area with the exhaust gas can be increased without reducing the pressure loss.

次に、図２，３を用いて本発明のＨＣトラップ触媒を従来のものと比較して説明する。   Next, the HC trap catalyst of the present invention will be described in comparison with a conventional one using FIGS.

図２はＨＣの脱離時間と脱離量との関係を示した図であり、特性Ｉの一点鎖線は吸着層を平均的な厚さに担持した形状での脱離の様子を示したものであり、特性IIの二点鎖線は特性Ｉと同じ吸着材量で最大吸着層厚さが増すように担持した形状での脱離の様子を示したものである。また、図３は吸着層の最大吸着層厚さとＨＣ浄化効率との関係を示した図であり、各特性Ｉ，IIの最大吸着層厚さをｈ１，ｈ２とし、これに対応するＨＣ浄化効率をη１，η２とする。   FIG. 2 is a diagram showing the relationship between the HC desorption time and the desorption amount, and the one-dot chain line of the characteristic I shows the desorption state in a shape in which the adsorption layer is supported at an average thickness. The alternate long and two short dashes line of characteristic II shows the state of desorption with the same amount of adsorbent as that of characteristic I so as to increase the maximum adsorption layer thickness. FIG. 3 is a graph showing the relationship between the maximum adsorption layer thickness of the adsorption layer and the HC purification efficiency. The maximum adsorption layer thicknesses of the respective characteristics I and II are h1 and h2, and the corresponding HC purification efficiency. Are η1 and η2.

図２に示すように、特性Ｉ，IIは所定期間ＴにおいてＨＣの脱離を行っている。特性Ｉは所定期間Ｔの略中間時刻ｔ１においてＨＣ脱離量のピークが発生しており、特性IIは所定期間Ｔの終盤の時刻ｔ２においてＨＣ脱離量のピークが発生している。この結果から吸着層を厚くすることにより、ＨＣの脱離するピークのタイミングを遅らせることが可能であることが解る。ＨＣの脱離するタイミングを遅らせた分の時間だけ触媒層の温度が上がり、より活性化させることができ、脱離したＨＣをより浄化させることができるので、ＨＣ浄化効率が向上される。   As shown in FIG. 2, characteristics I and II perform HC desorption in a predetermined period T. In the characteristic I, the peak of the HC desorption amount occurs at approximately the intermediate time t1 of the predetermined period T, and in the characteristic II, the peak of the HC desorption amount occurs at the time t2 at the end of the predetermined period T. From this result, it can be seen that by increasing the thickness of the adsorption layer, the timing of the peak at which HC desorbs can be delayed. The temperature of the catalyst layer rises by the amount of time that the timing of HC desorption is delayed, and the catalyst layer can be further activated, and the desorbed HC can be further purified, so that the HC purification efficiency is improved.

ここで、ＨＣトラップ触媒の性能は、吸着特性と脱離・浄化特性とに分けることができ、吸着特性は排ガス接触面積に影響され、脱離・浄化特性は吸着層の厚さに影響される。これにより、ＨＣトラップ触媒の性能向上には、排ガス接触面積、即ち、排ガス通路を大きくすると共に、吸着層を厚くすることが考えられる。しかし、同一セル構造において吸着層を厚くするには吸着材の担持量を増やすことで可能となるが、排ガス接触面積が減少して圧力損失を招いてしまう。従って、本発明の吸着層の形状では、吸着材の担持量の増加で厚さを変化させるのではなく、吸着層の形状を変えることにより吸着層の厚さを増減させるため、排ガス接触面積を減少させず、且つ圧力損失を増大させることなく、吸着層２を厚くしてＨＣの脱離タイミングを制御できるので、ＨＣ浄化性能を効率的に向上させることができる。   Here, the performance of the HC trap catalyst can be divided into adsorption characteristics and desorption / purification characteristics. The adsorption characteristics are affected by the exhaust gas contact area, and the desorption / purification characteristics are affected by the thickness of the adsorption layer. . Thereby, in order to improve the performance of the HC trap catalyst, it is conceivable to increase the exhaust gas contact area, that is, the exhaust gas passage, and increase the thickness of the adsorption layer. However, in order to increase the thickness of the adsorption layer in the same cell structure, it is possible to increase the amount of adsorbent supported, but the exhaust gas contact area is reduced and pressure loss is caused. Therefore, in the shape of the adsorption layer of the present invention, the thickness of the adsorption layer is not changed by increasing the amount of adsorbent supported, but by changing the shape of the adsorption layer. Since the adsorption layer 2 can be made thick and the desorption timing of HC can be controlled without decreasing and increasing the pressure loss, the HC purification performance can be improved efficiently.

なお、上記の吸着層の形状においては、略正四角形の空洞を開口するように形成されているが、図４に示すように、セル断面の角部に対応して設けられる吸着層の表面が、セル断面の重心に向けて凸形状としてもよい。   In addition, in the shape of the above adsorption layer, it is formed so as to open a substantially square-shaped cavity, but as shown in FIG. 4, the surface of the adsorption layer provided corresponding to the corner of the cell cross section is A convex shape may be formed toward the center of gravity of the cell cross section.

図４に示すＨＣトラップ触媒は、担体１上に、吸着材からなる吸着層５２を形成した後、該吸着層５２の上層に、触媒からなる触媒層５３を形成したものであり、担体１の角部１ａ，１ｂ，１ｃ，１ｄに対向する吸着層５２の表面は、セル断面の重心Ｇ１に向かって凸形状をなし、角部（例えば１ａ）と重心Ｇ１とを結ぶ直線状において、吸着層５２の最大厚さ（ａ＋ｉ）［ｉ＞ｂ］となるように形成されている。従って、このような吸着層５２の形状においても、部分的に吸着層５２の最大厚さを厚くすることにより、ＨＣの離脱するタイミングを部分的に遅らせることができるので、ＨＣ浄化効率を向上させることができる。   The HC trap catalyst shown in FIG. 4 is obtained by forming an adsorbent layer 52 made of an adsorbent on a carrier 1 and then forming a catalyst layer 53 made of a catalyst on the upper layer of the adsorbent layer 52. The surface of the adsorption layer 52 facing the corners 1a, 1b, 1c, and 1d has a convex shape toward the center of gravity G1 of the cell cross section, and in the straight line connecting the corner (for example, 1a) and the center of gravity G1, The maximum thickness 52 is (a + i) [i> b]. Therefore, even in such a shape of the adsorption layer 52, by partially increasing the maximum thickness of the adsorption layer 52, it is possible to partially delay the timing of HC separation, thereby improving the HC purification efficiency. be able to.

更に、上記の吸着層の形状においては、全ての角部１ａ，１ｂ，１ｃ，１ｄに均等に吸着材を担持させているが、図５，６に示すように、角部のいずれか１つ以上に対して集中して担持してもよい。   Further, in the shape of the above-described adsorption layer, the adsorbent is uniformly supported on all the corners 1a, 1b, 1c, and 1d. However, as shown in FIGS. You may concentrate and carry | support with respect to the above.

図５に示すＨＣトラップ触媒は、担体１上に、吸着材からなる吸着層１２を形成した後、該吸着層１２の上層に、触媒からなる触媒層１３を形成したものであり、セル各辺に内接する長方形の排ガス通路１４を備えている。そして、この吸着層１２の形状は、角部１ａ，１ｃとセル断面の重心Ｇ１とを結ぶ直線上において、吸着層１２の最大厚さ（ａ＋ｄ）[ｄ＞ｂ]となるように形成されている。従って、このような吸着層１２の形状においても、部分的に吸着層１２の最大厚さを厚くすることにより、ＨＣの脱離タイミングを部分的に遅らせることができるので、ＨＣ浄化効率を向上させることができる。   The HC trap catalyst shown in FIG. 5 is obtained by forming an adsorption layer 12 made of an adsorbent on a carrier 1 and then forming a catalyst layer 13 made of a catalyst on the upper layer of the adsorption layer 12. Is provided with a rectangular exhaust gas passage 14 inscribed therein. And the shape of this adsorption layer 12 is formed so that it may become the maximum thickness (a + d) [d> b] of the adsorption layer 12 on the straight line which connects the corner | angular parts 1a and 1c and the gravity center G1 of a cell cross section. Yes. Accordingly, even in such a shape of the adsorption layer 12, the HC desorption timing can be partially delayed by partially increasing the maximum thickness of the adsorption layer 12, thereby improving the HC purification efficiency. be able to.

また、図６に示すＨＣトラップ触媒は、担体１上に、吸着材からなる吸着層２２を形成した後、該吸着層２２の上層に、触媒からなる触媒層２３を形成したものであり、セル各辺に内接する六角形の排ガス通路２４を備えている。そして、この吸着層２２の形状は、角部１ａとセル断面の重心Ｇ１とを結ぶ直線上において、吸着層２２の最大厚さ（ａ＋ｅ）[ｅ＞ｂ]となるように形成されている。従って、このような吸着層２２の形状においても、部分的に吸着層２２の最大厚さを厚くすることにより、ＨＣの脱離タイミングを部分的に遅らせることができるので、ＨＣ浄化効率を向上させることができる。   The HC trap catalyst shown in FIG. 6 is obtained by forming an adsorption layer 22 made of an adsorbent on a carrier 1 and then forming a catalyst layer 23 made of a catalyst on the upper layer of the adsorption layer 22. A hexagonal exhaust gas passage 24 inscribed on each side is provided. And the shape of this adsorption layer 22 is formed so that it may become the maximum thickness (a + e) [e> b] of the adsorption layer 22 on the straight line which connects the corner | angular part 1a and the gravity center G1 of a cell cross section. Therefore, even in such a shape of the adsorption layer 22, the HC desorption timing can be partially delayed by partially increasing the maximum thickness of the adsorption layer 22, thereby improving the HC purification efficiency. be able to.

更に、上記の吸着層の形状においては、セル断面が略正四角形の形状について説明したが、図７，８に示すように、セル断面が略正三角形の形状に適用することもできる。   Furthermore, in the shape of the adsorption layer described above, the cell cross section has been described as having a substantially regular square shape. However, as shown in FIGS. 7 and 8, the cell cross section can also be applied to a substantially regular triangle shape.

図７に示すＨＣトラップ触媒は、セル断面が略正三角形からなる担体３１上に、吸着材からなる吸着層３２を形成した後、該吸着層３２の上層に、触媒からなる触媒層３３を形成したものであり、セル各辺の中央部に内接する略正三角形の排ガス通路３４を備えている。そして、この吸着層３２の形状は、角部３１ａ，３１ｂ，３１ｃとセル断面の重心Ｇ２とを結ぶ直線上において、吸着層３２の最大厚さｆとなるように形成されている。従って、このような吸着層３２の形状においても、最大厚さを厚くしてＨＣの脱離タイミングを遅らせることができるので、ＨＣ浄化効率を向上させることができる。   In the HC trap catalyst shown in FIG. 7, an adsorbing layer 32 made of an adsorbent is formed on a carrier 31 having a cell cross section of a substantially equilateral triangle, and then a catalyst layer 33 made of a catalyst is formed on the upper layer of the adsorbing layer 32. It is provided with a substantially equilateral triangular exhaust gas passage 34 inscribed in the center of each side of the cell. And the shape of this adsorption layer 32 is formed so that it may become the maximum thickness f of the adsorption layer 32 on the straight line which connects corner | angular part 31a, 31b, 31c and the gravity center G2 of a cell cross section. Accordingly, even in such a shape of the adsorption layer 32, the maximum thickness can be increased and the HC desorption timing can be delayed, so that the HC purification efficiency can be improved.

また、図８に示すＨＣトラップ触媒は、担体３１上に、吸着材からなる吸着層４２を形成した後、該吸着層４２の上層に、触媒からなる触媒層４３を形成したものであり、セル各辺に内接する四角形の排ガス通路４４を備えている。そして、この吸着層４２の形状は、角部３１ａとセル断面の重心Ｇ２とを結ぶ直線上において、吸着層４２の最大厚さｇとなるように形成されている。従って、このような吸着層４２の形状においても、部分的に吸着層４２の最大厚さを厚くすることにより、ＨＣの脱離タイミングを部分的に遅らせることができるので、ＨＣ浄化効率を向上させることができる。   The HC trap catalyst shown in FIG. 8 is obtained by forming an adsorption layer 42 made of an adsorbent on a carrier 31 and then forming a catalyst layer 43 made of a catalyst on the upper layer of the adsorption layer 42. A square exhaust gas passage 44 inscribed on each side is provided. And the shape of this adsorption layer 42 is formed so that it may become the maximum thickness g of the adsorption layer 42 on the straight line which connects the corner | angular part 31a and the gravity center G2 of a cell cross section. Accordingly, even in such a shape of the adsorption layer 42, the HC desorption timing can be partially delayed by partially increasing the maximum thickness of the adsorption layer 42, thereby improving the HC purification efficiency. be able to.

なお、図１，４，５，６に記載した吸着層及び触媒層の形状においては、図９に記載した吸着層及び触媒層の形状に基づいて設定しているが、このような方法に限定されることはなく、セル断面の角部近傍に、より多く吸着材を担持するような吸着層の形状であれば構わない。   The shapes of the adsorption layer and the catalyst layer described in FIGS. 1, 4, 5, and 6 are set based on the shapes of the adsorption layer and the catalyst layer described in FIG. However, the shape of the adsorbing layer may be such that more adsorbent is supported near the corner of the cell cross section.

内燃機関の排気系に設けられ、排ガス中の有害成分を浄化する排気ガス浄化装置に適用可能である。   The present invention is applicable to an exhaust gas purification device that is provided in an exhaust system of an internal combustion engine and purifies harmful components in exhaust gas.

本発明の一実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on one Example of this invention. ＨＣの脱離時間と脱離量との関係を示した図である。It is the figure which showed the relationship between the desorption time of HC, and desorption amount. 吸着層の最大吸着層厚さとＨＣ浄化効率との関係を示した図である。It is the figure which showed the relationship between the maximum adsorption layer thickness of an adsorption layer, and HC purification efficiency. 本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on the other Example of this invention. 本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on the other Example of this invention. 本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on the other Example of this invention. 本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on the other Example of this invention. 本発明の他の実施例に係るＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the HC trap catalyst which concerns on the other Example of this invention. 従来のＨＣトラップ触媒の吸着層及び触媒層の形状を示した図である。It is the figure which showed the shape of the adsorption layer and catalyst layer of the conventional HC trap catalyst.

符号の説明Explanation of symbols

１，３１ 担体
２，１２，２２，３２，４２，５２ 吸着層
３，１３，２３，３３，４３，５３ 触媒層
４，１４，２４，３４，４４，５４ 排ガス通路 1,31 Support 2,12,22,32,42,52 Adsorption layer 3,13,23,33,43,53 Catalyst layer 4,14,24,34,44,54 Exhaust gas passage

Claims (4)

セル断面が多角形からなる担体上に、
炭化水素吸着機能を有する吸着材が担持される吸着層と、
前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、
前記セル断面内で、前記吸着層で囲まれる領域の断面に前記セル断面内側に向かう凸部が形成され、
該凸部は前記セル断面の角部に対向して設けられる
ことを特徴とするＨＣトラップ触媒。 On a carrier whose cell cross section is a polygon,
An adsorption layer on which an adsorbent having a hydrocarbon adsorption function is supported;
An HC trap catalyst, which is provided in the upper layer of the adsorption layer and forms a catalyst layer on which a catalyst having a function of purifying harmful components in exhaust gas is supported,
Within the cell cross-section, a convex portion is formed on the cross-section of the region surrounded by the adsorption layer toward the cell cross-section inner side,
The HC trap catalyst, wherein the convex portion is provided to face a corner of the cell cross section. セル断面が多角形からなる担体上に、
炭化水素吸着機能を有する吸着材が担持される吸着層と、
前記吸着層の上層に設けられ、排ガス中の有害成分の浄化機能を有する触媒が担持される触媒層とを形成したＨＣトラップ触媒であって、
前記セル断面内で、前記吸着層で囲まれる領域の断面が多角形に形成され、
該吸着層で囲まれる領域の断面の辺部は前記セル断面の角部に対向して設けられる
ことを特徴とするＨＣトラップ触媒。 On a carrier whose cell cross section is a polygon,
An adsorption layer on which an adsorbent having a hydrocarbon adsorption function is supported;
An HC trap catalyst, which is provided in the upper layer of the adsorption layer and forms a catalyst layer on which a catalyst having a function of purifying harmful components in exhaust gas is supported,
Within the cell cross section, the cross section of the region surrounded by the adsorption layer is formed in a polygon,
An HC trap catalyst, wherein a side portion of a cross section of a region surrounded by the adsorption layer is provided to face a corner portion of the cell cross section. 請求項１または２に記載のＨＣトラップ触媒において、
前記セル断面の少なくとも１つの角部から前記セル断面の重心に向かう前記吸着層の厚さが最大になるように形成される
ことを特徴とするＨＣトラップ触媒。 The HC trap catalyst according to claim 1 or 2,
The HC trap catalyst, wherein the HC trap catalyst is formed so that the thickness of the adsorption layer from at least one corner of the cell cross section toward the center of gravity of the cell cross section is maximized. 請求項１乃至３のいずれかに記載のＨＣトラップ触媒において、
前記触媒層を前記セル断面の辺部に内接させる
ことを特徴とするＨＣトラップ触媒。 In the HC trap catalyst according to any one of claims 1 to 3,
An HC trap catalyst, wherein the catalyst layer is inscribed in a side portion of the cell cross section.
JP2005358428A 2005-12-13 2005-12-13 HC trap catalyst Expired - Fee Related JP4872334B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012133055A1 (en) 2011-03-29 2012-10-04 トヨタ自動車株式会社 Exhaust gas purification catalyst

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JP2001079423A (en) * 1999-07-15 2001-03-27 Nissan Motor Co Ltd Exhaust gas cleaning catalyst
JP2002339737A (en) * 2001-05-15 2002-11-27 Toyota Motor Corp Exhaust emission control device of internal combustion engine
JP2004066013A (en) * 2002-08-01 2004-03-04 Nissan Motor Co Ltd Catalyst for purification of exhaust gas

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JPH08299809A (en) * 1995-05-12 1996-11-19 Hitachi Ltd Production of honeycomb catalyst
JPH11104462A (en) * 1997-09-30 1999-04-20 Ngk Insulators Ltd Catalyst-adsorber for purification of exhaust gas and purification of exhaust gas
JP2001079423A (en) * 1999-07-15 2001-03-27 Nissan Motor Co Ltd Exhaust gas cleaning catalyst
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012133055A1 (en) 2011-03-29 2012-10-04 トヨタ自動車株式会社 Exhaust gas purification catalyst

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