JPS6125644A - Monolithic catalyst for purifying waste gas - Google Patents
Monolithic catalyst for purifying waste gasInfo
- Publication number
- JPS6125644A JPS6125644A JP59145051A JP14505184A JPS6125644A JP S6125644 A JPS6125644 A JP S6125644A JP 59145051 A JP59145051 A JP 59145051A JP 14505184 A JP14505184 A JP 14505184A JP S6125644 A JPS6125644 A JP S6125644A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- monolithic
- rhodium
- carrier
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
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に関する。[Detailed description of the invention] 〔Technical field〕 The present invention relates to a monolithic catalyst for exhaust gas purification.
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
が多く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、ｌ−当り１５〜１００個のセル
が形成されている。In recent years, monolithic catalysts have been increasingly used instead of pellet catalysts as catalysts for purifying exhaust gas emitted from internal combustion engines such as automobiles. This monolithic catalyst is made by coating a monolithic cordierite support with activated alumina, and then supporting active components with catalytic action, such as noble metals such as platinum (Pt) and palladium (Pd). In addition, the monolithic carrier that serves as the base of this monolithic catalyst is a carrier with an integrally molded structure,
Regular small holes such as square, triangular, hexagonal, etc. are provided in the flow direction of the exhaust gas, and 15 to 100 cells are formed per liter.
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、中央部は排気ガスの流速が大きいが外周部は
流速が小さくなっている。また、触媒成分は各セル内に
均一に担持されている。Furthermore, in the conventional monolith catalyst, each of the cells is uniform in size, and the flow velocity of exhaust gas is high in the central part, but the flow velocity is low in the outer peripheral part. Further, the catalyst component is uniformly supported within each cell.
ところで、モノリス触媒の劣化は熱劣化によるものが極
めて大きい。即ち、モノリス触媒に導入される排気ガス
の温度は、通″Ｘ３００℃〜５００℃（場合によっては
更に高温になる）という高温であり、この排気ガス中の
一酸化炭素、炭化水素、窒素酸化物が触媒成分と反応し
て反応熱により更に高温となり、触媒成分の劣化を促進
する。By the way, the deterioration of monolithic catalysts is extremely largely due to thermal deterioration. In other words, the temperature of the exhaust gas introduced into the monolithic catalyst is generally as high as 300°C to 500°C (even higher in some cases), and carbon monoxide, hydrocarbons, and nitrogen oxides in this exhaust gas are reacts with the catalyst component, and the heat of reaction increases the temperature further, promoting deterioration of the catalyst component.
また、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。更に、流速の大きい中央部では
、最高排気ガス温度がモノリス触媒の下流側に位置し、
一方、流速の小さい外周部では上流側で主に反応が進む
ため最高排気ガス温度が上流側に位置する。このため、
特に上記部分で比表面積の減少が見られ、当該部分の熱
劣化が著しい。Further, when the monolith catalyst is used, it is mounted in a catalytic converter container having a cone portion and used as a catalytic converter, and the cone portion allows the flow velocity distribution of exhaust gas to be distributed in the radial direction of the monolith catalyst. That is, the flow of exhaust gas is large in the radial center portion of the monolith 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 monolith catalyst. Furthermore, in the central region where the flow velocity is high, the highest exhaust gas temperature is located downstream of the monolith catalyst,
On the other hand, in the outer circumference where the flow velocity is low, the reaction mainly proceeds on the upstream side, so the maximum exhaust gas temperature is located on the upstream side. For this reason,
In particular, a decrease in the specific surface area was observed in the above-mentioned portions, and the thermal deterioration of these portions was significant.
この結果、外周部における上流側と中央部における下流
側の触媒成分の負担が大きくなるために、使用の経過と
共に、浄化性能が徐々に悪化し、耐久性が十分でないと
いう問題がある。As a result, the load on the catalyst components on the upstream side in the outer circumferential portion and the downstream side in the central portion increases, so that there is a problem that the purification performance gradually deteriorates as the use progresses, and the durability is insufficient.
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、排気ガスと触媒成分との反
応温度が最も高くなる部分の触媒成分の耐熱性を上げる
ことにより、触媒の長期にわたる浄化性能の維持、向上
を図ることにある。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 improve the heat resistance of the catalyst component in the portion where the reaction temperature between exhaust gas and the catalyst component is the highest. The purpose is to maintain and improve the purification performance of the catalyst over a long period of time.
かかる目的は、本発明によれば、次の排気ガス浄化用モ
ノリス触媒によって達成される。According to the present invention, this object is achieved by the following monolithic catalyst for purifying exhaust gas.
即ち、本発明の排気ガス浄化用モノリス触媒は柱状をな
し、内部に排気ガスの入口側から出口側に向けて軸方向
に多数のセルを有するモノリス担体に、アルミナ層が形
成され、このアルミナ層に触媒成分が担持された排気ガ
ス浄化用モノリス触媒であって、
前記触媒成分は、排気ガスの流れの速いモノリス触媒の
半径方向の中央部では、軸方向において排気ガスの入口
側より出口側に多く担持され、かつ排気ガスの流れの遅
いモノリス触媒の半径方向の外周部では、軸方向におい
て排気ガスの出口側より入口側に多く担持されているこ
とを特徴としている。That is, the monolithic catalyst for exhaust gas purification of the present invention has a columnar shape and has an alumina layer formed on a monolithic carrier having a large number of cells in the axial direction from the exhaust gas inlet side to the exhaust gas outlet side. A monolithic catalyst for exhaust gas purification in which a catalytic component is supported on the monolithic catalyst, wherein the catalytic component is axially distributed from the exhaust gas inlet side to the exhaust gas outlet side in a radially central portion of the monolithic catalyst where exhaust gas flows quickly. In the radial outer circumferential portion of the monolithic catalyst, in which a large amount of catalyst is supported and the flow of exhaust gas is slow, the monolithic catalyst is characterized in that in the axial direction, more of the catalyst is supported on the exhaust gas inlet side than on the exhaust gas outlet side.
本発明の排気ガス浄化用モノリス触媒によれば、排気ガ
スと触媒成分の反応により高温となる部分、即ちモノリ
ス触媒の中央部における排気ガスの下流側および外周部
の上流側の部分の触媒成分の担持量をその他の部分より
多くしたため、当該部分の耐久性が向上する。According to the monolithic catalyst for exhaust gas purification of the present invention, the catalyst components in the parts that become high temperature due to the reaction between the exhaust gas and the catalyst components, that is, the downstream side of the exhaust gas in the central part of the monolithic catalyst and the upstream part of the outer peripheral part. Since the supported amount is larger than that of other parts, the durability of this part is improved.
以上より、本発明の排気ガス浄化用モノリス触媒によれ
ば、従来高温となり触媒成分の劣化の激しい部分の触媒
担持量を多（したため、耐久性が向上し、長期にわたり
触媒性能の維持、向上が図れる。As described above, according to the monolithic catalyst for exhaust gas purification of the present invention, the amount of catalyst supported is increased in the areas where conventionally high temperatures occur and the catalyst components are severely deteriorated, so the durability is improved and the catalyst performance can be maintained and improved over a long period of time. I can figure it out.
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〜第３図は本発明の詳細な説明する図で
ある。Here, FIGS. 1 to 3 are diagrams for explaining the present invention in detail.
アルミナ含有量１０重量％（以下、％はすべで重量％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４５０ｍ
１ｔ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、撹外してスラリーを開
裂した。このスラリー中に直径１００１ｍ、長さ１５０
ｍｍ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。Add 150 g of a 40% aluminum nitrate aqueous solution to 00 g of alumina silica with an alumina content of 10% by weight (hereinafter all % indicates weight%), and add 450 ml of ion-exchanged water.
1 t was added and stirred to obtain a mixed suspension. into it γ-
1000 g of alumina powder was added and stirred to cleave the slurry. In this slurry, diameter 1001m, length 150
A cylindrical monolithic carrier 1 having a diameter of 1 mm was immersed, pulled up, and excess slurry was blown off with air. Next, 200
An activated alumina layer was formed on the surface of the monolithic carrier 1 by drying at 700° 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、ジニトロジアンミン白金水溶液（Ｐｔ （
ＮＨ，）ｒ （Ｎｏ、）ｚ）０．５ｇ／１２に１時間
浸漬した。引き上げて余分な水分を吹きとばし、２００
°Ｃで１時間乾燥した。続いて、塩化ロジウム水溶液０
．０５ｇ／ｌに浸漬し、同様な操作でロジウムを担持さ
せた。この結果、モノリス担体ｌの全表面に白金０．５
ｇ ／ ｊ！とロジウム０．０５ｇ／ｊ！が担持され
た。The monolithic carrier 1 on which this activated alumina layer has been formed is immersed in distilled water to absorb sufficient water, then pulled out and blown off excess water.
It was immersed in NH,)r (No,)z)0.5g/12 for 1 hour. Pull it up, blow off the excess water, and heat it for 200
Dry for 1 hour at °C. Subsequently, rhodium chloride aqueous solution 0
．． 05 g/l, and rhodium was supported in the same manner. As a result, 0.5% platinum was applied to the entire surface of the monolithic carrier l.
g/j! and rhodium 0.05g/j! was carried.
次に、第２図に示すように、モノリス担体電の外周部を
マスキング材２で覆い、モノリス担体１の上部５０龍を
残してジニトロジアンミン白金水溶液０．５ｇ／ｌに１
時間浸漬し、引き上げて余分な水分を吹きとばし、２０
０℃で１時間乾燥した。Next, as shown in FIG. 2, the outer periphery of the monolithic carrier electrode is covered with a masking material 2, and the upper part 50 of the monolithic carrier 1 is covered with a dinitrodiammine platinum aqueous solution of 0.5 g/l.
Soak for an hour, pull out and blow off excess water,
It was dried at 0°C for 1 hour.
続いて、塩化ロジウム水溶液０．０５ｇ／ｊ！に浸漬し
、同様な方法でロジウムを担持した。Next, rhodium chloride aqueous solution 0.05g/j! and loaded with rhodium in the same manner.
次いで、モノリス担体１の上下を逆にし、第３図に示す
ように、中央部をマスキング材２で覆い、上記と同様な
方法でジニトロジアンミン白金水溶液０．５ ｇ ／
ｊ！と塩化ロジウム水溶液０．０５ｇ／ｌに浸漬し、白
金とロジウムを担持した。Next, the monolithic carrier 1 is turned upside down, the central part is covered with a masking material 2, as shown in FIG.
j! and 0.05 g/l of rhodium chloride aqueous solution to support platinum and rhodium.
この結果、ｇ１４１ＦＩ！Ｊに示すように、モノリス触
媒の半径方向中央部において、排気ガスの入口側から中
央に向かって５０ｆｉの範囲および外周部において、排
気ガスの出口側から中央に向かって５０龍の範囲は白金
が０．５ｇ／Ａ、ロジウムが０．０５ｇ／Ｉｌ担持され
た触媒成分低担持領域Ａとなり、その他の部分、即ち中
央部において、排気ガスの出口側から中央に向かって１
００ｆｌの範囲および外周部において、排気ガスの入口
側から中央に向かって１００１ｍの範囲には白金が１．
０ｇ／ｆｆ、ロジウムが０．１ｇ／ｌ担持された触媒成
分高担持領域Ｂとなったモノリス触媒Ｘを得た。なお、
説明の便宜上、低担持領域Ａをハンチング、高担持領域
Ｂをクロスハンチングで示す。As a result, g141FI! As shown in J, in the radial center of the monolithic catalyst, platinum is present in an area of 50 fi from the exhaust gas inlet side toward the center, and in an area of 50 fi from the exhaust gas outlet side toward the center on the outer periphery. 0.5g/A, rhodium is supported at 0.05g/Il in the catalyst component low loading area A, and in the other part, that is, the central part, from the exhaust gas outlet side to the center.
In the range of 00 fl and the outer periphery, platinum is 1.0 m in the range from the exhaust gas inlet side to the center.
A monolithic catalyst X having a high catalyst component loading region B in which rhodium was supported at 0 g/ff and 0.1 g/l was obtained. In addition,
For convenience of explanation, the low loading area A is shown by hunting, and the high loading area B is shown by cross hunting.
（比較例）
実施例と同しモノリス担体に、実施例と同様な方法でス
ラリー中に浸漬して活性アルミナ層を形成し、このモノ
リス担体を十分吸水させた後、引き上げて余分な水分を
吹き払いジニトロジアンミン白金水溶液（ｐｔ （ＮＨ
，）、（Ｎｏ、）＊）に１時間浸漬した。引き上げて余
分な水分を吹きとばし、２００℃で１時間乾燥した後、
同様にして塩化ロジウム水溶液に浸漬し、モノリス担体
全体に均一に白金とロジウムが担持されたモノリス触媒
Ｙを得た。このとき、白金とロジウムの担持総量は実施
例と同じにした。(Comparative example) The same monolithic carrier as in the example was immersed in a slurry in the same manner as in the example to form an activated alumina layer, and after the monolithic carrier had sufficiently absorbed water, it was pulled out and excess water was blown off. Remove dinitrodiammine platinum aqueous solution (pt (NH
, ), (No, )*) for 1 hour. After pulling it up, blowing off the excess moisture, and drying it at 200℃ for 1 hour,
In the same manner, the monolithic catalyst Y was immersed in an aqueous rhodium chloride solution to obtain a monolithic catalyst Y in which platinum and rhodium were uniformly supported on the entire monolithic carrier. At this time, the total amount of platinum and rhodium supported was the same as in the example.
（比較試験）
上記Ｘ、Ｙ２種のモノリス触媒を、それぞれ触媒コンバ
ータ容器に装着し触媒コンバータとした後、以下の方法
で耐久試験を実施し、浄化性能を評価した。(Comparative Test) After each of the two types of monolithic catalysts X and Y was installed in a catalytic converter container to form a catalytic converter, a durability test was conducted in the following manner to evaluate the purification performance.
この耐久試験は、２０００ｃｃのガソリンエンジンの排
気系に上記触媒コンバータを取付け、有鉛ガソリン（Ｐ
ｂ：Ｏ，Ｏ１ｇ／Ｊ含有）を用い、空燃質（Ａ／Ｆ）
： １４．６、空間速度（ＳＶ）：６００００ｈｒ、
触媒床温度７００℃、７５０℃、８００℃のｌｉ頬で運
転し、２００時間後に浄化率を測定した。なお、浄化率
の測定は、排気ガス温度が３００℃の場合について、Ａ
／Ｆ：１４．６で行った。この結果を後掲の第１表に示
す。In this durability test, the above catalytic converter was attached to the exhaust system of a 2000cc gasoline engine, and leaded gasoline (P
b: O, containing O1g/J), air fuel quality (A/F)
: 14.6, space velocity (SV): 60000hr,
The reactor was operated under conditions of catalyst bed temperature of 700°C, 750°C, and 800°C, and the purification rate was measured after 200 hours. The purification rate was measured when the exhaust gas temperature was 300°C.
/F: 14.6. The results are shown in Table 1 below.
第１表より明らかなように、本発明の実施例によるモノ
リス触媒Ｘは、従来のモノリス触媒Ｙより高活性であり
、耐久性に優れていることが判る。As is clear from Table 1, it can be seen that the monolithic catalyst X according to the example of the present invention has higher activity and superior durability than the conventional monolithic catalyst Y.
なお、従来より触媒成分を高担持した領域を設けたため
、低温活性も優れている。In addition, since a region with a higher catalytic component supported than before is provided, low-temperature activity is also excellent.
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、実施例では触媒成分の低担持領域を、中央部に
おいて、排気ガスの入口側から中央に向かって全長の１
／３の部分および外周部において、排気ガスの出口側か
ら中央に向かって全長の１／３の部分としたが、この範
囲は適宜変えることができる。For example, in the example, the low catalyst component loading area is set at the center part of the entire length from the exhaust gas inlet side to the center.
In the /3 portion and the outer peripheral portion, the portion is 1/3 of the total length from the exhaust gas outlet side toward the center, but this range can be changed as appropriate.
また、触媒成分の担持量の変化は、実施例のように段階
的に変えてもよいが、入口側から出口側に向けて漸増ま
たは漸減するように設けてもよい。Further, the amount of supported catalyst components may be changed stepwise as in the embodiment, but it may also be set such that it gradually increases or decreases from the inlet side to the outlet side.
第１表Table 1
第１図は本発明の実施例により得られたモノリス触媒に
おける触媒成分の高担持領域と低担持領域を模式的に示
す説明図、
第２図は本発明の実施例の一工程である外周部をマスキ
ングした状態を説明する図であり、第２図（ａ）は平面
図、第２図（ｂ）は断面構成図、第３図は本発明の実施
例の一工程である中央部をマスキングした状態を説明す
る図であり、第３図（ａ）は平面図、第３図（ｂ）は断
面構成図である。
１−一一−モノリス担体
２−ｍ−マスキング材
Ａ −−−一触媒成分低担持領域
Ｂ −−−一触媒成分高担持領域
Ｘ・−一−−モノリス触媒FIG. 1 is an explanatory diagram schematically showing a high loading area and a low loading area of catalyst components in a monolithic catalyst obtained in an example of the present invention. FIG. FIG. 2(a) is a plan view, FIG. 2(b) is a cross-sectional configuration diagram, and FIG. 3 is a diagram illustrating a state in which the central part is masked, which is a step of an embodiment of the present invention. FIG. 3(a) is a plan view and FIG. 3(b) is a cross-sectional configuration diagram. 1-11-Monolith carrier 2-m-Masking material A---One catalyst component low loading area B---One catalyst component high loading area X・-One---Monolith catalyst
Claims (1)
に向けて軸方向に多数のセルを有するモノリス担体に、
アルミナ層が形成され、このアルミナ層に触媒成分が担
持された排気ガス浄化用モノリス触媒であって、 前記触媒成分は、排気ガスの流れの速いモノリス触媒の
半径方向の中央部では、軸方向において排気ガスの入口
側より出口側に多く担持され、かつ排気ガスの流れの遅
いモノリス触媒の半径方向の外周部では、軸方向におい
て排気ガスの出口側より入口側に多く担持されているこ
とを特徴とする排気ガス浄化用モノリス触媒。(1) A monolith carrier that is columnar and has a large number of cells in the axial direction from the exhaust gas inlet side to the outlet side,
A monolithic catalyst for exhaust gas purification in which an alumina layer is formed and a catalytic component is supported on the alumina layer, and the catalytic component is disposed in the axial direction in the radial center of the monolithic catalyst where the exhaust gas flows quickly. It is characterized in that more catalysts are supported on the exhaust gas outlet side than on the exhaust gas inlet side, and on the radial outer circumference of the monolithic catalyst where exhaust gas flows slowly, more catalysts are supported on the exhaust gas inlet side in the axial direction than on the exhaust gas outlet side. A monolithic catalyst for exhaust gas purification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59145051A JPS6125644A (en) | 1984-07-12 | 1984-07-12 | Monolithic catalyst for purifying waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59145051A JPS6125644A (en) | 1984-07-12 | 1984-07-12 | Monolithic catalyst for purifying waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6125644A true JPS6125644A (en) | 1986-02-04 |
Family
ID=15376243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59145051A Pending JPS6125644A (en) | 1984-07-12 | 1984-07-12 | Monolithic catalyst for purifying waste gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6125644A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0399203A2 (en) * | 1989-04-20 | 1990-11-28 | Degussa Aktiengesellschaft | Monolith or honeycomb catalyst |
| EP1342499A1 (en) * | 2002-03-07 | 2003-09-10 | Delphi Technologies, Inc. | Multizone catalytic converter |
| EP1598111A1 (en) * | 2004-05-15 | 2005-11-23 | Delphi Technologies, Inc. | Catalyst concentration gradient in a catalysed filter |
| EP1679119A1 (en) * | 2004-12-24 | 2006-07-12 | Cataler Corporation | Filter catalyst for exhaust gas purification of a diesel engine and its method of production |
| WO2008080696A1 (en) * | 2006-12-28 | 2008-07-10 | Robert Bosch Gmbh | Filter element and filter for the exhaust-gas aftertreatment of an internal combustion engine |
| GB2557644A (en) * | 2016-12-14 | 2018-06-27 | Ford Global Tech Llc | Improvements in or relating to flow optimised washcoating |
| US10099212B2 (en) * | 2016-03-15 | 2018-10-16 | Cummins Emission Solutions Inc. | Hydrocarbon storage optimization and coking prevention on an oxidation catalyst |
-
1984
- 1984-07-12 JP JP59145051A patent/JPS6125644A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0399203A2 (en) * | 1989-04-20 | 1990-11-28 | Degussa Aktiengesellschaft | Monolith or honeycomb catalyst |
| EP1342499A1 (en) * | 2002-03-07 | 2003-09-10 | Delphi Technologies, Inc. | Multizone catalytic converter |
| LU90900B1 (en) * | 2002-03-07 | 2003-10-27 | Delphi Tech Inc | Multizone catalytic converter |
| EP1598111A1 (en) * | 2004-05-15 | 2005-11-23 | Delphi Technologies, Inc. | Catalyst concentration gradient in a catalysed filter |
| EP1679119A1 (en) * | 2004-12-24 | 2006-07-12 | Cataler Corporation | Filter catalyst for exhaust gas purification of a diesel engine and its method of production |
| EP1859864A1 (en) * | 2004-12-24 | 2007-11-28 | Cataler Corporation | Filter catalyst for exhaust gas purification of a diesel engine and its method of production |
| WO2008080696A1 (en) * | 2006-12-28 | 2008-07-10 | Robert Bosch Gmbh | Filter element and filter for the exhaust-gas aftertreatment of an internal combustion engine |
| US10099212B2 (en) * | 2016-03-15 | 2018-10-16 | Cummins Emission Solutions Inc. | Hydrocarbon storage optimization and coking prevention on an oxidation catalyst |
| GB2557644A (en) * | 2016-12-14 | 2018-06-27 | Ford Global Tech Llc | Improvements in or relating to flow optimised washcoating |
| US10632496B2 (en) | 2016-12-14 | 2020-04-28 | Ford Global Technologies, Llc | Relating to flow optimized washcoating |
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