JPS6121734A - Method for supporting catalytic component of monolithic catalyst for purifying exhaust gas - Google Patents
Method for supporting catalytic component of monolithic catalyst for purifying exhaust gasInfo
- Publication number
- JPS6121734A JPS6121734A JP59141987A JP14198784A JPS6121734A JP S6121734 A JPS6121734 A JP S6121734A JP 59141987 A JP59141987 A JP 59141987A JP 14198784 A JP14198784 A JP 14198784A JP S6121734 A JPS6121734 A JP S6121734A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- monolithic
- supporting
- exhaust gas
- monolithic catalyst
- 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.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003197 catalytic effect Effects 0.000 title abstract description 6
- 230000005587 bubbling Effects 0.000 claims abstract description 26
- 238000000746 purification Methods 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 9
- 239000002002 slurry Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000725 suspension Substances 0.000 abstract description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 235000012489 doughnuts Nutrition 0.000 abstract 1
- 150000002500 ions Chemical group 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 230000000873 masking effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- SEPPVOUBHWNCAW-FNORWQNLSA-N (E)-4-oxonon-2-enal Chemical compound CCCCCC(=O)\C=C\C=O SEPPVOUBHWNCAW-FNORWQNLSA-N 0.000 description 1
- LLBZPESJRQGYMB-UHFFFAOYSA-N 4-one Natural products O1C(C(=O)CC)CC(C)C11C2(C)CCC(C3(C)C(C(C)(CO)C(OC4C(C(O)C(O)C(COC5C(C(O)C(O)CO5)OC5C(C(OC6C(C(O)C(O)C(CO)O6)O)C(O)C(CO)O5)OC5C(C(O)C(O)C(C)O5)O)O4)O)CC3)CC3)=C3C2(C)CC1 LLBZPESJRQGYMB-UHFFFAOYSA-N 0.000 description 1
- IXSUHTFXKKBBJP-UHFFFAOYSA-L azanide;platinum(2+);dinitrite Chemical compound [NH2-].[NH2-].[Pt+2].[O-]N=O.[O-]N=O IXSUHTFXKKBBJP-UHFFFAOYSA-L 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は排気ガス浄化用モノリス触媒の触媒成分担持方
法に関し、詳しくはモノリス触媒の半径分が漸減または
段階的に減少して担持されている排気ガス浄化用モノリ
ス触媒の触媒成分担持方法に関する。[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification, and more specifically, the present invention relates to a method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification. The present invention relates to a method for supporting a catalyst component on a monolithic catalyst for use.
近年、自動車等の内燃機関から排出される排気ガスを浄
化する触媒として、ペレット触媒に代わりモノリス触媒
が多（用いられる傾向にある。このモノリス触媒は、一
体成形構造のコージェライト製モノリス担体に、活性ア
ルミナをコーティングした後、触媒作用のある活性成分
、例えば白金（Ｐｔ）、パラジウム（Ｐｄ）等の貴金属
を担持したものである。また、このモノリス触媒の基体
となるモノリス担体は、一体成形構造を有した担体で、
排気ガスの流れ方向に正方形、三角形、六角形等の規則
正しい小孔が設けられ、１−当り１５〜１００個のセル
が形成されている。In recent years, monolith catalysts have been increasingly used instead of pellet catalysts as catalysts for purifying exhaust gas emitted from internal combustion engines such as automobiles. After coating activated alumina, active components with catalytic action, such as noble metals such as platinum (Pt) and palladium (Pd), are supported.The monolithic support, which is the base of this monolithic catalyst, has an integrally molded structure. A carrier having
Regular small holes such as square, triangular, hexagonal, etc. are provided in the flow direction of exhaust gas, and 15 to 100 cells are formed per one hole.
また、従来のモノリス触媒は、上記各セルの大きさが均
一であり、触媒成分は各セル内に均一に担持されている
。Furthermore, in the conventional monolithic catalyst, each cell has a uniform size, and the catalyst components are uniformly supported in each cell.
ところで、モノリス触媒は使用に際しコーン部を有する
触媒コンバータ容器に装着され、触媒コンバータとして
利用されるが、このコーン部によりモノリス触媒の半径
方向に排気ガスの流速分布ができる。即ち、コーン部の
略入口径に対応するモノリス触媒の半径方向中央部では
排気ガスの流れが大きく、一方、モノリス触媒の外周部
では排気ガスの流れが遅い。このため、モノリス触媒の
中央部は周辺部に比べ早期に劣化すると共に、周辺部に
担持された触媒成分は十分に活用されないことになり、
モノリス触媒全体としての浄化性能が徐々に悪化し、耐
久性が十分でないという問題があった。By the way, when a monolithic catalyst is used, it is installed in a catalytic converter container having a cone portion and used as a catalytic converter, and the cone portion creates a flow velocity distribution of exhaust gas in the radial direction of the monolithic catalyst. That is, the flow of exhaust gas is large in the radial center portion of the monolithic catalyst corresponding to approximately the inlet diameter of the cone portion, while the flow of exhaust gas is slow in the outer peripheral portion of the monolithic catalyst. For this reason, the central part of the monolithic catalyst deteriorates earlier than the peripheral part, and the catalyst components supported in the peripheral part are not fully utilized.
There was a problem in that the purification performance of the monolith catalyst as a whole gradually deteriorated and its durability was insufficient.
そこで、モノリス触媒への排気ガスの流速または流量に
応じて触媒成分の担持量を変えることにより、浄化性能
の向上および耐久性の向♀を図９たモノリス触媒が提案
されている。Therefore, a monolith catalyst has been proposed that improves purification performance and durability by changing the amount of catalyst components supported depending on the flow rate or flow rate of exhaust gas to the monolith catalyst.
ところで、従来、モノリス触媒の半径方向において、中
央部から周辺部に向けて触媒成分が漸減または段階的に
減少して担持されているモノリス触媒を製造するには、
例えばマスキング材を用い、中央部と周辺部を交互にマ
スキングして、それぞれ濃度の異なる触媒成分担持溶液
に浸漬することにより行っていた。By the way, conventionally, in the radial direction of the monolith catalyst, in order to produce a monolith catalyst in which catalyst components are supported in a manner that gradually decreases or decreases stepwise from the center toward the periphery,
For example, this has been carried out by alternately masking the center and the periphery using a masking material, and immersing them in catalyst component supporting solutions having different concentrations.
しかしながら、上記担持方法では、マスキングする必要
があること、触媒成分の濃度が異なる担持溶液に浸漬す
るｄ・要があるため、触・媒成分担持工程が倍になり効
率が悪いという問題がある。However, in the above-mentioned supporting method, there is a problem that the catalyst/catalyst component supporting step is doubled and the efficiency is poor because it requires masking and immersion in supporting solutions having different concentrations of catalyst components.
本発明は、上記従来技術の問題を解決するためになされ
たもので、本発明の目的は、モノリス触媒の半径方向に
おいて、中央部から周辺部に向けて触媒成分が漸減また
は段階的に減少して担持されているモノリス触媒を効率
よく得ることにある。The present invention has been made in order to solve the problems of the prior art described above, and an object of the present invention is to reduce the catalyst components gradually or stepwise from the center to the periphery in the radial direction of the monolithic catalyst. The purpose of this invention is to efficiently obtain a monolithic catalyst supported on a monolithic catalyst.
かかる目的は、本発明によれば、次の排気ガス浄化用上
ノリ不触媒の触媒成分担持方法によって達成される。According to the present invention, this object is achieved by the following method for supporting a catalyst component on a topless non-catalyst for exhaust gas purification.
即ち、本発明の排気ガス浄化用モノリス触媒の−触媒成
分担持方法は、モノリス担体に触媒成分が担持されたモ
ノリス触媒の半径方向において、中央部から周辺部に向
けて触媒成分が漸減または段階的に減少して担持されて
いる排気ガス浄化用モ ５ノリス触媒の触媒成分担持方
法であって、前記触媒成分の担持溶液中に、モノリス触
媒の直径と略同径もしくはそれ以下の径を有し、上面に
多数の小孔を備えたドーナツ状バブリング管を配し、こ
のバブリング管の上に略同心にモノリス担体を設置した
後、バブリング管の小孔から空気を放出させながら所定
時間保持することを特徴としている。That is, the method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification according to the present invention is such that the catalyst component is gradually reduced or stepped in the radial direction of the monolithic catalyst in which the catalyst component is supported on the monolithic carrier from the center toward the peripheral portion. A method for supporting a catalyst component of a monolithic catalyst for exhaust gas purification in which the catalyst component is supported in a supporting solution having a diameter approximately equal to or smaller than the diameter of the monolithic catalyst. A donut-shaped bubbling tube with a large number of small holes is arranged on the top surface, and a monolithic carrier is placed approximately concentrically on top of the bubbling tube, and then held for a predetermined period of time while releasing air from the small holes of the bubbling tube. It is characterized by
本発明において使用するバブリング管は、ドーナツ状の
円管または楕円管であり、載置された状態で上方に向け
て適宜間隔で複数の小孔が設けられている。このバブリ
ング管は、モノリス触媒の半径と略同しか、あるいはモ
ノリス触媒の半径より小径とされている。バブリング管
は径の大きさの異なるものを複数設けてもよく、その場
合は径の小さいバブリング管はど小孔の数を少な（する
ことにより、触媒成分の担持量を半径方向で中央部から
周辺部へ向けて減少するよう制御することができる。ま
た、バブリング管を用いる場合、触媒成分の担持量は、
小孔の大きさ、数、更には放出する空気量を制御するこ
とにより、容易に変えることができる。The bubbling tube used in the present invention is a donut-shaped circular tube or an elliptical tube, and a plurality of small holes are provided at appropriate intervals upward in a placed state. This bubbling tube has a diameter that is approximately the same as or smaller than the radius of the monolith catalyst. Multiple bubbling tubes with different diameters may be provided; in this case, the bubbling tube with a smaller diameter has fewer small holes (by doing so, the amount of catalyst components supported in the radial direction can be reduced from the center). It can be controlled so that it decreases toward the periphery.Also, when using a bubbling tube, the amount of supported catalyst components can be controlled to decrease toward the peripheral area.
This can be easily changed by controlling the size and number of small holes, as well as the amount of air released.
本発明によれば、モノリス担体を触媒成分担持溶液に浸
漬したとき、周辺部はバブリング管からの気泡により、
モノリス担体の内壁面と担持溶液との接触面積および接
触する機会が減る。このため、気泡の多いところ程触媒
成分の担持量が少なくなる。この結果、周辺部はど気泡
を多くすることにより、モノリス触媒の半径方向におい
て、中央部から周辺部へ向けて触媒成分が減少して担持
されたモノリス触媒が得られる。According to the present invention, when the monolithic carrier is immersed in the catalyst component supporting solution, the peripheral portion is caused by air bubbles from the bubbling tube.
The contact area and chance of contact between the inner wall surface of the monolithic carrier and the supporting solution is reduced. Therefore, the more bubbles there are, the smaller the amount of catalyst components supported will be. As a result, by increasing the number of bubbles at the periphery, a supported monolithic catalyst can be obtained in which the catalyst components decrease from the center to the periphery in the radial direction of the monolithic catalyst.
以上より、本発明の排気ガス浄化用モノリス触媒の触媒
成分担持方法によれば、以下の効果を奏する。As described above, the method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification according to the present invention provides the following effects.
（イ）従来の如くマスキング材を用いて触媒成分の担持
を行う場合に比べ、担持工程が半分で済み触媒成分担持
工程の短縮化、効率化が図れる。また、マスキング材を
被覆する手間が省ける。(a) Compared to the conventional case where the catalyst component is supported using a masking material, the supporting process is halved, and the process of supporting the catalyst component can be shortened and made more efficient. Further, the effort of covering with masking material can be saved.
（ロ）バブリング管の小孔から放出される空気量を調整
することにより、触媒成分担持量の調整を極めて容易に
行うことができる。(b) By adjusting the amount of air released from the small holes of the bubbling tube, the amount of supported catalyst components can be adjusted very easily.
次に、本発明の実施例を図面を参考にして説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
ここで、第１図は本発明の実施例に係る排気ガス浄化用
モノリス触媒の触媒成分担持方法の一工程を示す斜視図
、第２図は第１図のｎ−ｎ線断面図である。Here, FIG. 1 is a perspective view showing one step of a method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line nn in FIG. 1.
まず、アルミナ含有量１０重量％（以下、％はすべて重
量％を示す）のアルミナシルア００ｇに、４０％硝酸ア
ルミニウム水溶液１５０ｇを加え、更にイオン交換水４
５０ｍｊ！を加えて撹拌し、混合懸濁液を得た。その中
へγ−アルミナ粉末１０００ｇを加え、撹拌してスラリ
ーを調製した。このスラリー中に直径１００１）１）、
長さ１５０寵の円柱形モノリス担体１を浸漬し、引き上
げて余分なスラリーをエアーにより吹きと、ばした。次
に、２００℃で１時間乾燥後、７００℃で２時間焼成す
ることによりモノリス担体１の表面に活性アルミナ層を
形成した。First, 150 g of a 40% aluminum nitrate aqueous solution was added to 00 g of alumina silica with an alumina content of 10% by weight (hereinafter, all percentages indicate weight%), and then 4 ml of ion-exchanged water was added.
50mj! was added and stirred to obtain a mixed suspension. 1000 g of γ-alumina powder was added thereto and stirred to prepare a slurry. In this slurry, diameter 1001)1),
A cylindrical monolithic carrier 1 having a length of 150 mm was immersed, pulled up, and the excess slurry was blown off with air. Next, an activated alumina layer was formed on the surface of the monolithic carrier 1 by drying at 200°C for 1 hour and then firing at 700°C for 2 hours.
この活性アルミナ層を形成したモノリス担体１を蒸留水
に浸漬して十分吸水させた後、引き上げて余分な水分を
吹き払い、第１図、第２図に示す触媒成分担持槽２に浸
漬した。この触媒成分担持槽２内には、ジニトロジアン
ミン白金水溶液３ 〔Ｐｔ （ＮＨ，）２ （ＮＯ
２） ２）１．０ｇ／ｌが満たされており、底部には
上面に多数の小孔４を設けたバブリング管５が設置され
ている。このバブリング管５は図示しない空気供給源に
接続されている。モノリス担体１をこのバブリング管５
の直上に排気ガスの流通方向を上下方向に向けて図示し
ない固定手段で固定する。そして、空気供給源からバブ
リング管５に圧縮空気を供給し、第２図に示すように、
モノリス担体１の周辺部に気泡６を通過させつつ１時間
保持した。その後、引き上げて余分な水分を吹きとばし
、２００℃で１時間乾燥した。The monolithic carrier 1 on which the activated alumina layer was formed was immersed in distilled water to absorb sufficient water, then pulled out, blown off excess water, and immersed in the catalyst component supporting tank 2 shown in FIGS. 1 and 2. In this catalyst component supporting tank 2, a dinitrodiammine platinum aqueous solution 3 [Pt (NH,)2 (NO
2) 2) It is filled with 1.0 g/l, and a bubbling tube 5 with a large number of small holes 4 provided on the top surface is installed at the bottom. This bubbling pipe 5 is connected to an air supply source (not shown). The monolith carrier 1 is connected to this bubbling tube 5.
It is fixed by a fixing means (not shown) directly above the exhaust gas with the exhaust gas flow direction facing up and down. Then, compressed air is supplied from the air supply source to the bubbling tube 5, and as shown in FIG.
The monolithic carrier 1 was held for 1 hour while passing air bubbles 6 around its periphery. Thereafter, it was pulled up, excess water was blown off, and it was dried at 200° C. for 1 hour.
この結果得られたモノリス触媒は、触媒成分である白金
が、中央部では１．０ｇ／ｊ！（触媒）、周辺部では約
０．５ｇ／Ｉｌ（触媒）担持されていた。The resulting monolithic catalyst contained 1.0 g/j of platinum, a catalyst component, in the center! (catalyst), and approximately 0.5 g/Il (catalyst) was supported in the peripheral area.
以上、本発明の特定の実施例について説明したが、本発
明は、この実施例に限定されるものではなく、特許請求
の範囲に記載の範囲内で種々の実施態様が包含されるも
のである。Although specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and includes various embodiments within the scope of the claims. .
例えば、実施例ではバブリング管を一つ設けた例を示し
たが、このバブリング管は複数設けても゛ よく、複
数設けた方が触媒成分担持量の制御はより容易となる。For example, in the embodiment, one bubbling tube is provided, but a plurality of bubbling tubes may be provided, and the amount of supported catalyst component can be more easily controlled by providing a plurality of bubbling tubes.
また、実施例では円管状のバブリング管を用いたが、モ
ノリス触媒の半径方向の断面が楕円形の場合は、楕円管
状のバブリング管を用いることが望ましい。Furthermore, although a circular bubbling tube was used in the embodiment, if the monolithic catalyst has an elliptical cross section in the radial direction, it is desirable to use an elliptical bubbling tube.
第１図は本発明の実施例に係る排気ガス浄化用モノリス
触媒の触媒成分担持方法の一工程を示す斜視図、
第２図は第１図のｎ−ｎ線断面図である。
１−・−モノリス担体
２−・−・・−触媒成分担持槽
３−一−−−・ジニトロジアンミン白金水溶液４−−−
−−一小孔
５−−−−−バブリング管
６・−−−一一気ン６１FIG. 1 is a perspective view showing one step of a method for supporting a catalyst component on a monolithic catalyst for exhaust gas purification according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line nn in FIG. 1. 1--Monolith carrier 2--Catalyst component supporting tank 3-1--Dinitrodiammine platinum aqueous solution 4--
--- One small hole 5 --- Bubbling tube 6 --- One single hole 61
Claims (1)
媒の半径方向において、中央部から周辺部に向けて触媒
成分が漸減または段階的に減少して担持されている排気
ガス浄化用モノリス触媒の触媒成分担持方法であって、 前記触媒成分の担持溶液中に、モノリス触媒の直径と略
同径もしくはそれ以下の径を有し、上面に多数の小孔を
備えたドーナツ状バブリング管を配し、このバブリング
管の上に略同心にモノリス担体を設置した後、バブリン
グ管の小孔から空気を放出させながら所定時間保持する
ことを特徴とする排気ガス浄化用モノリス触媒の触媒成
分担持方法。(1) A monolithic catalyst for exhaust gas purification in which catalyst components are supported on a monolithic carrier in the radial direction of the monolithic catalyst, in which the catalyst components are gradually reduced or gradually reduced from the center to the periphery. A method for supporting a component, wherein a donut-shaped bubbling tube having a diameter substantially the same as or smaller than the diameter of the monolithic catalyst and having a large number of small holes on the upper surface is disposed in the catalyst component supporting solution, A method for supporting a catalyst component in a monolithic catalyst for exhaust gas purification, characterized in that a monolithic carrier is placed substantially concentrically on the bubbling tube, and then held for a predetermined period of time while releasing air from small holes in the bubbling tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141987A JPS6121734A (en) | 1984-07-09 | 1984-07-09 | Method for supporting catalytic component of monolithic catalyst for purifying exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59141987A JPS6121734A (en) | 1984-07-09 | 1984-07-09 | Method for supporting catalytic component of monolithic catalyst for purifying exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6121734A true JPS6121734A (en) | 1986-01-30 |
Family
ID=15304756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59141987A Pending JPS6121734A (en) | 1984-07-09 | 1984-07-09 | Method for supporting catalytic component of monolithic catalyst for purifying exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6121734A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112718A (en) * | 1993-08-17 | 1995-05-02 | Kazuo Miyata | Method for boxing packed vegetable and packed vegetable used therefor |
-
1984
- 1984-07-09 JP JP59141987A patent/JPS6121734A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112718A (en) * | 1993-08-17 | 1995-05-02 | Kazuo Miyata | Method for boxing packed vegetable and packed vegetable used therefor |
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