JP2810129B2 - Method for producing catalyst for purifying automobile exhaust gas - Google Patents
Method for producing catalyst for purifying automobile exhaust gasInfo
- Publication number
- JP2810129B2 JP2810129B2 JP1193562A JP19356289A JP2810129B2 JP 2810129 B2 JP2810129 B2 JP 2810129B2 JP 1193562 A JP1193562 A JP 1193562A JP 19356289 A JP19356289 A JP 19356289A JP 2810129 B2 JP2810129 B2 JP 2810129B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- chlorine
- gas purifying
- catalyst 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.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は自動車用排気ガス浄化用触媒の製造方法に関
する。Description: TECHNICAL FIELD The present invention relates to a method for producing an exhaust gas purifying catalyst for an automobile.
（従来の技術） 自動車用排気ガス浄化用触媒の製造方法としては、特
開昭59−209646号公報或いは特開昭61−197036号公報に
示され、第２図（イ）〜（ハ）に示す方法が知られてい
る。(Description of the Related Art) A method for producing an exhaust gas purifying catalyst for an automobile is disclosed in JP-A-59-209646 or JP-A-61-197036, and is shown in FIGS. The method shown is known.
すなわち、（イ）に示すように、ハニカム構造体等よ
りなる触媒用担体ａに活性アルミナを担持させた後、こ
の触媒用担体ａを、PtCl2、RhCl3、PdCl2等よりなる触
媒用貴金属の塩化物を少なくとも一種含有するスラリー
液ｂ中に浸漬して、触媒用担体ａに前記スラリー液ｂを
コートする。その後、この触媒用担体ａを（ロ）に示す
ようにして乾燥した後、（ハ）に示すように加熱炉ｃ中
でスラリー液ｂを焼成して、触媒用貴金属の塩化物を触
媒担体ａに担持させて自動車用排気ガス浄化用触媒を得
ている。That is, as shown in (a), after activated alumina is supported on a catalyst carrier a made of a honeycomb structure or the like, the catalyst carrier a is made of a noble metal catalyst made of PtCl 2 , RhCl 3 , PdCl 2 or the like. Is immersed in a slurry liquid b containing at least one of the above chlorides to coat the catalyst support a with the slurry liquid b. Thereafter, the catalyst carrier a is dried as shown in (b), and then the slurry liquid b is baked in a heating furnace c as shown in (c) to remove the chloride of the catalyst noble metal from the catalyst carrier a. To obtain an exhaust gas purifying catalyst for automobiles.
（発明が解決しようとする課題） しかるに、前記のようにして得た自動車用排気ガス浄
化用触媒を、第３図に示すような自動車の排気系、つま
り、エンジンｄ、排気管ｅ及びサイレンサーｆ等よりな
る排気系に、自動車用排気ガス浄化用触媒として前方排
気ガス浄化用触媒ｇ及び主排気ガス浄化用触媒ｈを装着
すると、自動車用排気ガス浄化用触媒より顆粒側の排気
系、つまり、排気ガス浄化用触媒g,hよりも下流側の排
気管ｅ及びサイレンサーｆの内部が腐蝕するという問題
が発生する。(Problems to be Solved by the Invention) However, the exhaust gas purifying catalyst for an automobile obtained as described above is applied to an automobile exhaust system as shown in FIG. 3, that is, an engine d, an exhaust pipe e, and a silencer f. When a front exhaust gas purifying catalyst g and a main exhaust gas purifying catalyst h are mounted as an automotive exhaust gas purifying catalyst in the exhaust system composed of the above, an exhaust system on the granule side of the automobile exhaust gas purifying catalyst, that is, There is a problem that the inside of the exhaust pipe e and the silencer f downstream of the exhaust gas purifying catalysts g and h are corroded.
これに対して、従来は、排気ガス浄化用触媒g,hより
も下流側の排気系を耐腐蝕性の材料、例えばSUS410（ク
ロム:11.5〜13.5％）のステンレス鋼等の材料で形成す
ることによって対処してきたが、このような耐腐蝕性の
材料を用いても、排気ガス浄化用触媒g,hより下流側の
排気系に発生する腐蝕を防止することはできなかった。On the other hand, conventionally, the exhaust system downstream of the exhaust gas purifying catalysts g and h is formed of a corrosion-resistant material, for example, a material such as stainless steel of SUS410 (chromium: 11.5-13.5%). However, even if such a corrosion-resistant material was used, it was not possible to prevent corrosion generated in the exhaust system downstream of the exhaust gas purifying catalysts g and h.
そこで、本発明者は、排気系の腐蝕箇所を分析して、
以下に説明するような結論を得た。すなわち、エンジン
ｄから排出された高温の排気ガスが自動車用排気ガス浄
化用触媒g,hを通過すると、貴金属の塩化物より生成さ
れ焼成時に触媒用担体ａ中に止まっていた塩素、及び、
触媒用担体ａに担持されている貴金属の塩化物から遊離
する塩素イオンが排気ガス浄化用触媒から排気ガス中に
放出される。そして、これらの塩素及び塩素イオンが排
気ガス中の水素或いは水と反応して塩酸が生成され、こ
の塩酸が排気系の内部に付着し、排気ガス浄化用触媒g,
hより下流の排気系を腐蝕させるのが原因である。Therefore, the present inventor analyzed the corrosion portion of the exhaust system,
The following conclusions were reached. That is, when high-temperature exhaust gas discharged from the engine d passes through the automotive exhaust gas purifying catalysts g and h, chlorine generated from a chloride of a noble metal and remaining in the catalyst carrier a at the time of calcination, and
Chloride ions released from the noble metal chloride carried on the catalyst carrier a are released into the exhaust gas from the exhaust gas purifying catalyst. Then, these chlorine and chlorine ions react with hydrogen or water in the exhaust gas to generate hydrochloric acid, and the hydrochloric acid adheres to the inside of the exhaust system, and the exhaust gas purifying catalyst g,
This is because the exhaust system downstream of h is corroded.
また、本発明者は次のような実験を行なって、前記の
結論を裏付けた。すなわち新品の自動車用排気ガス浄化
用触媒と、実車に装着されて40〜45キロマイル走行した
後の自動車用排気ガス浄化用触媒とを各々準備し、各々
の排気ガス浄化用触媒を蒸溜水に浸漬して排気ガス浄化
用触媒から塩素イオンを抽出し、この抽出液をイオンク
ロマトグラフ分析法で定量分析した。その結果、新品の
排気ガス浄化用触媒には触媒1Kg当り208mgの塩素が、走
行後の排気ガス浄化用触媒には触媒1Kg当り38mgの塩素
が夫々含有されていることが判った。このことから、排
気ガス浄化用触媒が実車に装着されて走行すると、新品
のときには多量に含有されていた塩素が減少すること、
つまり、走行中に自動車用排気ガス浄化用触媒から塩素
が多量に排出され、この排出された塩素が排気系を腐蝕
させる原因であるとの前記の結論が裏付けられた。Further, the present inventors have carried out the following experiment to support the above conclusion. That is, a new automobile exhaust gas purification catalyst and an automobile exhaust gas purification catalyst mounted on an actual vehicle and traveling for 40 to 45 km are prepared, and each exhaust gas purification catalyst is immersed in distilled water. Then, chlorine ions were extracted from the exhaust gas purifying catalyst, and the extracted liquid was quantitatively analyzed by ion chromatography. As a result, it was found that the new exhaust gas purifying catalyst contained 208 mg of chlorine per 1 kg of the catalyst, and the exhaust gas purifying catalyst after running contained 38 mg of chlorine per 1 kg of the catalyst. From this, when the exhaust gas purifying catalyst is mounted on an actual vehicle and traveling, the chlorine contained in a large amount when the vehicle is new is reduced,
That is, the above-mentioned conclusion was supported that a large amount of chlorine was emitted from the exhaust gas purifying catalyst for automobiles during traveling, and this exhausted chlorine was a cause of corrosion of the exhaust system.
前記に鑑み、本発明は、自動車用排気ガス浄化用触媒
が実車に装着されて走行しても、この触媒から塩素が排
出されないようにし、これにより、自動車用排気ガス浄
化用触媒より下流側の排気系が塩酸により腐蝕しないよ
うにすることを目的とする。In view of the above, the present invention prevents chlorine from being exhausted from a vehicle exhaust gas purifying catalyst even when the vehicle is mounted on an actual vehicle and traveling, whereby the downstream side of the vehicle exhaust gas purifying catalyst is provided. The purpose is to prevent the exhaust system from being corroded by hydrochloric acid.
（課題を解決するための手段） 前記の目的を達成するため、本発明は、触媒用貴金属
の塩化物が担持された触媒用担体から塩素又は塩素イオ
ンを水に抽出させて除去するものである。(Means for Solving the Problems) In order to achieve the above object, the present invention is to remove chlorine or chloride ion from water by extracting water or chlorine ions from a catalyst carrier carrying a chloride of a noble metal for catalyst. .
具体的に本発明の講じた解決手段は、触媒用担体に触
媒用貴金属の塩化物を含有するスラリー液をコートした
後に、焼成をすることによって、前記触媒用貴金属の塩
化物を前記触媒用担体に担持させ、しかる後、該触媒用
担体の内部に60〜90℃程度の温水を流通させ、これによ
り、該触媒用担体から塩素又は塩素イオンを前記温水に
抽出して除去する構成とするものである。Specifically, the solution taken by the present invention is to coat the catalyst carrier with a slurry liquid containing a catalyst noble metal chloride, and then by calcining the catalyst noble metal chloride to convert the catalyst noble metal chloride into the catalyst carrier. Then, hot water of about 60 to 90 ° C. is circulated inside the catalyst carrier, whereby chlorine or chloride ions are extracted from the catalyst carrier into the hot water and removed. It is.
（作用） 従って、上記製造方法によれば、焼成後の触媒用担体
が温水に晒されることになり、この担体中に含まれる塩
素が塩素イオンとなって該温水中に抽出されるととも
に、この担体に担持されている触媒用貴金属の塩化物か
ら塩素イオンが該温水中に遊離・抽出されるので、得ら
れる自動車用排気ガス浄化用触媒に含有される塩素及び
塩素イオンの量は減少する。このため、自動車に装着さ
れた自動車用排気ガス浄化用触媒中を高温の排気ガスが
通過しても、この自動車用浄化用触媒から塩素及び塩素
ガスが殆ど排出されない。(Action) Therefore, according to the above production method, the catalyst carrier after calcination is exposed to warm water, and chlorine contained in the carrier is converted into chlorine ions and extracted into the warm water. Since chloride ions are released and extracted into the warm water from the chloride of the catalytic noble metal supported on the carrier, the amounts of chlorine and chlorine ions contained in the resulting vehicle exhaust gas purifying catalyst are reduced. For this reason, even if high-temperature exhaust gas passes through an automobile exhaust gas purification catalyst mounted on an automobile, chlorine and chlorine gas are hardly discharged from the automobile purification catalyst.
（実施例） 以下、本発明の一実施例を図面に基づいて説明する。Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例に係る自動車用排気ガス
浄化用触媒の製造方法に用いる脱塩素処理装置Ａの平面
構造を示す。FIG. 1 shows a plan structure of a dechlorination treatment apparatus A used in a method of manufacturing a catalyst for purifying an automobile exhaust gas according to an embodiment of the present invention.
第１図において、10は触媒用担体12が浸漬される純水
を貯溜するための環状の処理用水槽、14は触媒用担体12
を載置するパレット、16はパレット14を昇降させるホイ
スト、18はホイスト16を走行可能に指示し、ホイスト16
ひいては触媒用担体12が載置されたパレット14を、処理
用水槽10の一側部（第１図における左側）の上方をコの
字状に通過させるホイストレールである。In FIG. 1, reference numeral 10 denotes an annular treatment water tank for storing pure water into which a catalyst carrier 12 is immersed, and 14 denotes a catalyst carrier 12.
Pallet, 16 is a hoist for raising and lowering the pallet 14, 18 is an instruction to enable the hoist 16 to run,
In addition, the hoist rail allows the pallet 14 on which the catalyst carrier 12 is placed to pass above one side (the left side in FIG. 1) of the treatment water tank 10 in a U-shape.
また、第１図において、20は処理用水槽10内部の純水
を加熱する加熱装置であって、加熱装置20は、処理用水
槽10内に配設された発熱体22と、発熱体22を発熱させる
ための電源24とを備えている。また、26は処理用水槽10
内部の純水に矢印に示す方向の水流を発生させる水流発
生装置であって、水流発生装置26は、純水を処理用水槽
10の周壁で開口いる流入管28を介して導入すると共に、
導入した純水を流出管30を介して導出するポンプ32と、
流出管30の流出口と連通しポンプ32から導出された純水
を先端に設けられたノズル34aから噴出させるノズルボ
ックス34とを備えている。In FIG. 1, reference numeral 20 denotes a heating device for heating pure water in the treatment water tank 10, and the heating device 20 includes a heating element 22 provided in the treatment water tank 10 and a heating element 22. A power supply 24 for generating heat is provided. 26 is the water tank for treatment 10
A water flow generator for generating a water flow in the direction indicated by an arrow in the pure water inside, wherein the water flow generator 26 is a pure water treatment tank.
With the introduction through the inflow pipe 28 which is open at the peripheral wall of 10,
A pump 32 for drawing out the introduced pure water through an outflow pipe 30,
A nozzle box 34 is provided, which communicates with the outlet of the outflow pipe 30 and ejects pure water derived from the pump 32 from a nozzle 34a provided at the tip.
また、第１図において、36は純水中に抽出された塩素
イオンをイオン交換して除去する陰イオン交換樹脂、38
は純水中の陰イオン量を検出するイオンメータ、40は処
理用水槽10から引き上げられた触媒用担体12を乾燥させ
る乾燥機であって、乾燥機40はその内部に温風発生装置
を備えている。さらに、同図において、42はホイスト16
の昇降と走行の制御、乾燥機40内の温風発生装置によっ
て発生する温風の温度及び風量の制御、水流発生装置26
のノズル34aから噴出する水流の流速の制御、発熱体22
に対する加熱温度の制御、イオンメータ38が検出した陰
イオン量に基づき行われる陰イオン交換樹脂36の回復制
御等を行なうシステムコントローラである。In FIG. 1, reference numeral 36 denotes an anion exchange resin which removes chlorine ions extracted in pure water by ion exchange;
Is an ion meter for detecting the amount of anions in pure water, 40 is a dryer for drying the catalyst carrier 12 pulled up from the treatment water tank 10, and the dryer 40 has a hot air generator therein. ing. Further, in FIG.
Of the hot air generated by the hot air generating device in the dryer 40, and the amount of hot air generated by the hot air generating device in the dryer 40;
Control of the flow velocity of the water flow ejected from the nozzle 34a of the
This is a system controller that controls the heating temperature of the anion-exchange resin 36 and controls the recovery of the anion-exchange resin 36 based on the amount of anions detected by the ion meter 38.
以下、脱塩素処理装置Ａを用いて自動車用排気ガス浄
化用触媒を製造する方法について説明する。Hereinafter, a method for producing an exhaust gas purifying catalyst for an automobile using the dechlorination apparatus A will be described.
まず、従来技術の項での説明と同様に、ハニカム構造
体等よりなる触媒用担体12の表面に活性アルミナと担持
させた後、この触媒用担体12を、PtCl2、RhCl3、PdCl2
等よりなる触媒用貴金属の塩化物のうちの少なくとも一
種を含有するスラリー液中に浸漬して、触媒用担体12の
表面に前記スラリー液をコートする。その後、このスラ
リー液を乾燥した後、加熱炉中で焼成して触媒用担体に
触媒容器金属の塩化物を担持させる。First, in the same manner as described in the section of the prior art, after supporting activated alumina on the surface of a catalyst support 12 composed of a honeycomb structure or the like, the catalyst support 12 is coated with PtCl 2 , RhCl 3 , PdCl 2
The catalyst liquid is coated on the surface of the catalyst carrier 12 by immersion in a slurry liquid containing at least one chloride of a noble metal for catalyst comprising Then, after drying this slurry liquid, it is baked in a heating furnace to allow the catalyst carrier to carry the chloride of the catalyst container metal.
次に、処理用水槽10の内部に多量の純水を貯溜し、加
熱装置20の発熱体22により純水を加熱すると共に、水流
発生装置26のポンプ32を制御してノズルボックス34のノ
ズル34aから純水を噴出させて水流を発生させる。Next, a large amount of pure water is stored inside the treatment water tank 10, the pure water is heated by the heating element 22 of the heating device 20, and the pump 32 of the water flow generating device 26 is controlled to control the nozzle 34a of the nozzle box 34. Pure water is spouted from the to generate a water flow.
次に、触媒用担体12をパレット14に載置し、このパレ
ット14をホイスト16により上昇させた後、処理用水槽10
の上方に搬送する。そして、パレット14が第１図の
（イ）に示すパレット降下位置まで搬送されてきたと
き、ホイスト16を下降させてパレット14に載置された触
媒用担体12を処理用水槽10の内部にディッピングする。Next, the catalyst carrier 12 is placed on the pallet 14, and the pallet 14 is lifted by the hoist 16, and then the treatment water tank 10
Conveyed above. Then, when the pallet 14 is transported to the pallet lowering position shown in FIG. 1A, the hoist 16 is lowered to dipping the catalyst carrier 12 placed on the pallet 14 into the treatment water tank 10. I do.
このようにすると、触媒用担体12の内部を温水化され
た純水が流通するので、焼成時に生成され触媒用担体12
の表面部に止まっている塩素と、触媒用担体12に担持さ
れている触媒用貴金属の塩化物から遊離する塩素イオン
とが、純水中に塩素イオンとして抽出される。この場
合、本実施例においては、純水が水流となって触媒用担
体23の内部を流通するので、塩素及び塩素イオンの抽出
が促進される。また、純水の加熱温度は60〜90℃程度で
あることが好ましく、これにより、塩素及び塩素イオン
の抽出が促進される。In this case, pure water that has been warmed flows through the inside of the catalyst carrier 12, so that the catalyst carrier 12 that is generated at the time of calcination is generated.
And chlorine ions released from the chloride of the catalyst noble metal supported on the catalyst carrier 12 are extracted as chlorine ions in pure water. In this case, in the present embodiment, since the pure water flows in the catalyst carrier 23 as a water stream, the extraction of chlorine and chlorine ions is promoted. Further, the heating temperature of the pure water is preferably about 60 to 90 ° C., whereby the extraction of chlorine and chlorine ions is promoted.
次に、ホイスト16を搬送して、触媒用担体12を純水中
にディッピングした状態で第１図の（ロ）に示すパレッ
ト上昇位置まで移送した後、ホイスト16を上昇させて触
媒用担体12を純水中から上昇させる。その後、触媒用担
体12を乾燥機40の内部で乾燥させて、自動車用排気ガス
浄化用触媒を得る。Next, the hoist 16 is conveyed and transferred to the pallet raising position shown in FIG. 1 (b) in a state where the catalyst carrier 12 is dipped in pure water. From pure water. Thereafter, the catalyst carrier 12 is dried inside the dryer 40 to obtain an exhaust gas purifying catalyst for an automobile.
（発明の効果） 以上説明したように、本発明に係る自動車用排気ガス
浄化用触媒の製造方法によると、触媒用貴金属の塩化物
を担持した触媒用担体の内部に60〜90℃程度の温水を流
通させて、該触媒用担体から塩素又は塩素イオンを抽
出、除去するので、自動車用排気ガス浄化用触媒中の塩
素は減少している。このため、本発明により得られた自
動車用排気ガス浄化用触媒中を高温の排気ガスが通過し
ても、塩素及び塩素イオンが殆ど排出されないために塩
酸が生成されずいので、自動車用排気ガス浄化用触媒よ
り下流側の排気系における塩酸による腐蝕を確実に防止
できる。(Effects of the Invention) As described above, according to the method for producing an exhaust gas purifying catalyst for an automobile according to the present invention, hot water of about 60 to 90 ° C is placed inside a catalyst carrier carrying a noble metal chloride for a catalyst. To extract and remove chlorine or chlorine ions from the catalyst carrier, so that chlorine in the exhaust gas purifying catalyst for automobiles is reduced. Therefore, even when high-temperature exhaust gas passes through the catalyst for purifying automobile exhaust gas obtained according to the present invention, chlorine and chlorine ions are hardly discharged, so that hydrochloric acid is not generated. Corrosion due to hydrochloric acid in the exhaust system downstream of the catalyst for use can be reliably prevented.
第１図は本発明の一実施例である自動車用排気ガス浄化
用触媒の製造方法に用いる脱塩素処理装置の平面図、第
２図（イ）〜（ハ）は本発明及び従来の自動車用排気ガ
ス浄化用触媒の製造方法に共通する各製造工程を示す斜
視図、第３図は本発明及び従来の自動車用排気ガス浄化
用触媒が装着される排気系の概略図である。 10……処理用水槽 12……触媒用担体 20……加熱装置 26……水流発生装置 36……陰イオン交換樹脂 40……乾燥機 42……システムコントローラFIG. 1 is a plan view of a dechlorination apparatus used in a method of manufacturing an exhaust gas purifying catalyst for an automobile according to one embodiment of the present invention, and FIGS. FIG. 3 is a perspective view showing manufacturing steps common to a method for manufacturing an exhaust gas purifying catalyst, and FIG. 3 is a schematic view of an exhaust system to which the present invention and a conventional automobile exhaust gas purifying catalyst are mounted. 10 Water tank for treatment 12 Carrier for catalyst 20 Heating device 26 Water flow generator 36 Anion exchange resin 40 Dryer 42 System controller
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B01J 21/00 - 38/74──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) B01J 21/00-38/74
Claims (1)
するスラリー液をコートした後、焼成をすることによっ
て、前記触媒用貴金属の塩化物を前記触媒用担体に担持
させ、しかる後、該触媒用担体の内部に60〜90℃程度の
温水を流通させ、これにより、該触媒用担体から塩素又
は塩素イオンを前記温水に抽出して除去することを特徴
とする自動車用排気ガス浄化用触媒の製造方法。Claims: 1. A catalyst carrier is coated with a slurry liquid containing a catalyst noble metal chloride, and then calcined, whereby the catalyst noble metal chloride is supported on the catalyst carrier. Hot water of about 60 to 90 ° C. is circulated inside the catalyst carrier, whereby chlorine or chloride ions are extracted from the catalyst carrier into the hot water and removed, thereby purifying exhaust gas for automobiles. Method for producing catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1193562A JP2810129B2 (en) | 1989-07-26 | 1989-07-26 | Method for producing catalyst for purifying automobile exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1193562A JP2810129B2 (en) | 1989-07-26 | 1989-07-26 | Method for producing catalyst for purifying automobile exhaust gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0360737A JPH0360737A (en) | 1991-03-15 |
| JP2810129B2 true JP2810129B2 (en) | 1998-10-15 |
Family
ID=16310098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1193562A Expired - Lifetime JP2810129B2 (en) | 1989-07-26 | 1989-07-26 | Method for producing catalyst for purifying automobile exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2810129B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6335823B2 (en) | 2015-03-25 | 2018-05-30 | 日本碍子株式会社 | Honeycomb structure and method for manufacturing honeycomb structure |
-
1989
- 1989-07-26 JP JP1193562A patent/JP2810129B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0360737A (en) | 1991-03-15 |
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