JPS60235642A - Preparation of monolithic catalyst for purifying exhaust gas - Google Patents
Preparation of monolithic catalyst for purifying exhaust gasInfo
- Publication number
- JPS60235642A JPS60235642A JP59091660A JP9166084A JPS60235642A JP S60235642 A JPS60235642 A JP S60235642A JP 59091660 A JP59091660 A JP 59091660A JP 9166084 A JP9166084 A JP 9166084A JP S60235642 A JPS60235642 A JP S60235642A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- catalyst
- carrier
- monolithic
- exhaust gas
- 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 70
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 238000000746 purification Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 229910052697 platinum Inorganic materials 0.000 abstract description 5
- 229910052703 rhodium Inorganic materials 0.000 abstract description 5
- 239000011810 insulating material Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 17
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000010948 rhodium Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 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 description 1
- 230000009471 action Effects 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
- 230000008901 benefit Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 210000000554 iris Anatomy 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (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製造方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for manufacturing a monolithic catalyst for exhaust gas purification.
内燃機関、特に自動車の排気ガス浄化用触媒は、耐久性
、浄化性能等につき極めて高度な性能が要求されている
。従来、この排気ガス浄化用触媒としてモノリス触媒や
粒状触媒等が用いられてきたが、最近ではモノリス触媒
が粒状触媒に比べ、熱容量が小さく、暖機性に優れ、更
に背圧が小さいという利点を有することが着目され、モ
ノリス触媒が広く採用される傾向にある。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、活性アルミナを担持した後、触媒作用のある活性成
分（通常は貴金属）を担持したものである。Catalysts for purifying exhaust gas from internal combustion engines, particularly automobiles, are required to have extremely high performance in terms of durability, purification performance, and the like. Traditionally, monolithic catalysts and granular catalysts have been used as exhaust gas purification catalysts, but recently, monolithic catalysts have the advantage of having a smaller heat capacity, better warm-up performance, and lower back pressure than granular catalysts. As a result, monolithic catalysts are becoming widely adopted. This monolithic catalyst has activated alumina supported on a cordierite monolithic support having an integrally molded structure, and then an active component having a catalytic effect (usually a noble metal) supported thereon.
この触媒成分としては、白金（Ｐｔ）、ロジウム（Ｒｈ
）、パラジウム（Ｐｄ）等の貴金属の一種または２種以
上を担持したものが用いられている。The catalyst components include platinum (Pt), rhodium (Rh
), palladium (Pd), and other noble metals are used.
これらの触媒成分を担持したモノリス触媒を触媒コンバ
ータに装着して排気ガスを通過させると、排気ガス中に
含有される有害物質である炭化水素（ＨＣ）、−酸化炭
素（Ｃｏ）および窒素酸化物（ＮＯＸ）が酸化または還
元反応により効率よく浄化される。When a monolithic catalyst supporting these catalyst components is attached to a catalytic converter and exhaust gas is passed through, the harmful substances contained in the exhaust gas such as hydrocarbons (HC), -carbon oxides (Co) and nitrogen oxides are removed. (NOX) is efficiently purified by oxidation or reduction reaction.
ところで、従来のモノリス触媒はモノリス担体全体もし
くは外周部を除いたすべてのセルにアルミナをコーティ
ングし、このアルミナ層に貴金属を担持している。しか
しながら、モノリス触媒は触媒コンバータ内での保持構
造からモノリス触媒の周辺部は排気ガスが流れにくくな
っており、このためこの周辺部には触媒成分を未担持と
するか、中央部より減少させることが提案されている。By the way, in conventional monolithic catalysts, the entire monolithic carrier or all the cells except for the outer periphery are coated with alumina, and the noble metal is supported on this alumina layer. However, due to the holding structure of the monolith catalyst within the catalytic converter, it is difficult for exhaust gas to flow around the monolith catalyst, so it is necessary to either leave the catalyst components unsupported in this peripheral area or to reduce the amount of catalyst components from the central area. is proposed.
この周辺部において、触媒成分を未担持あるいは減少さ
せたモノリス触媒の製造方法として、触媒含有溶液に浸
漬する前に、予め周辺部のセルをセラミックあるいは樹
脂等で閉塞させるか、マスキング材を用いて周辺部に蓋
をし、その後触媒含有溶液に１ｊｊ：潰していた。As a method for manufacturing a monolithic catalyst in which catalyst components are not supported or are reduced in this peripheral area, cells in the peripheral area are closed in advance with ceramic or resin, or a masking material is used before immersion in a catalyst-containing solution. The surrounding area was covered with a lid, and then 1jj: crushed in a catalyst-containing solution.
しかしながら、上記方法では触媒担持工程が複雑となる
ため、より効率のよい排気ガス浄化用モノリス触媒の製
造方法が望まれていた。However, in the above method, the catalyst supporting step is complicated, and therefore, a more efficient method for manufacturing a monolithic catalyst for exhaust gas purification has been desired.
本発明は上記要望に基づいてなされたもので、本発明の
目的は、モノリス担体に被覆するアルミナ層の材質を中
央部と周辺部で変えることにより、中央部の触媒担持量
が多く、かつ周辺部の触媒担持量がほとんど無いかまた
は中央部より少なくしたモノリス触媒を、容易かつ迅速
に得ることにある。The present invention has been made based on the above request, and an object of the present invention is to change the material of the alumina layer covering the monolithic support between the central part and the peripheral part, thereby increasing the amount of catalyst supported in the central part and The object of the present invention is to easily and quickly obtain a monolithic catalyst in which the amount of catalyst supported in the central portion is almost zero or less than that in the central portion.
かかる目的は、本発明によれば、次の排気ガス浄化用モ
ノリス触媒の製造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 manufacturing a monolithic 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製造方法
は柱状をなし、排気ガスの入口側から出口側に向かって
軸方向に多数のセルが設けられており、このセル内壁面
にアルミナ層が形成され、このアルミナ層に触媒成分が
担持されている排気ガス浄化用モノリス触媒の製造方法
であって、前記アルミナ層は、半径方向において、中央
部はＴ−アルミナもしくはθ−アルミナとし、かつ周辺
部はα−アルミナとした後、触媒成分を含有する溶液に
浸漬し、取り出して乾燥、焼成することを特徴としてい
る。That is, the method for producing a monolithic catalyst for exhaust gas purification according to the present invention has a columnar shape, and a large number of cells are provided in the axial direction from the exhaust gas inlet side to the exhaust gas outlet side, and an alumina layer is formed on the inner wall surface of the cell. A method for producing a monolithic catalyst for exhaust gas purification in which a catalyst component is supported on the alumina layer, wherein the alumina layer has T-alumina or θ-alumina in the center in the radial direction, and The process is characterized in that after forming α-alumina, it is immersed in a solution containing a catalyst component, taken out, dried, and calcined.
本発明の排気ガス浄化用モノリス触媒の製造方法によれ
ば、モノリス担体の中央部には触媒の吸着効果の大きい
γ−アルミナまたはθ−アルミナが被覆されており、周
辺部には触媒の吸着効果かはとんどないα−アルミナが
被覆されているため、通常の方法で触媒含有溶液に浸漬
し、引き上げて余分な水溶液を吹き払い、乾燥、焼成す
ると、アルミナの材質の違いによる吸着力の差により、
モノリス担体の中央部には触媒成分が通常どおり担持さ
れ、周辺部には触媒が全く担持されないか、または中央
部より少なく担持されたモノリス触媒が得られる。According to the method of manufacturing a monolithic catalyst for exhaust gas purification of the present invention, the central part of the monolithic carrier is coated with γ-alumina or θ-alumina, which has a large catalyst adsorption effect, and the peripheral part has a large catalyst adsorption effect. Since the shell is coated with α-alumina, if you immerse it in a catalyst-containing solution in the usual way, pull it out, blow off the excess aqueous solution, dry it, and sinter it, you will notice that the adsorption power differs due to the difference in the alumina material. Due to the difference,
A monolithic catalyst is obtained in which catalyst components are supported in the central part of the monolithic carrier as usual, and no catalyst is supported in the peripheral part, or in which less catalyst is supported than in the central part.
以上より、本発明の排気ガス浄化用モノリス触媒の製造
方法によれば、周辺部の触媒担持量を中央部より少なく
したモノリス触媒を、容易かつ迅速に得ることができる
。As described above, according to the method for manufacturing a monolithic catalyst for exhaust gas purification of the present invention, a monolithic catalyst in which the amount of catalyst supported in the peripheral portion is smaller than that in the central portion can be easily and quickly obtained.
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.
（第１実施例）
γ−アルミナ粉末１０００ｇ、アルミナ含有量が１０重
量％のアルミナシルア００ｇ、４０重量％硝酸アルミニ
ウム水溶液１５０ｇおよびイオン交換水４５０ｍ１を混
合撹拌してスラリーを調製した。このスラリー中に、直
径１１００ｔ、長さ１００ｎ、体積７８５ｒｒｗ？のコ
ージェライト質モノリス担体を浸漬し、引き上げて余分
な水分を気流により吹きとばした後、２００℃で２時間
乾燥した。(First Example) A slurry was prepared by mixing and stirring 1000 g of γ-alumina powder, 00 g of alumina silua having an alumina content of 10% by weight, 150 g of a 40% by weight aqueous aluminum nitrate solution, and 450 ml of ion-exchanged water. This slurry has a diameter of 1100t, a length of 100n, and a volume of 785rrw? A cordierite monolithic support was immersed in the solution, pulled out, excess moisture was blown off by an air current, and then dried at 200° C. for 2 hours.
このモノリス担体１を、第１図に示すように、モノリス
担体１の排気ガスの入口側と出口側を断熱材２で塞いだ
状態で電気炉３内に設置し、１１５０℃で焼成した。こ
の結果、第２図に示すように、Ｔ−アルミナはモノリス
担体１の周辺部４ではα−アルミナに変わり、また中央
部５ではγ−アルミナのままか、あるいは一部がθ−ア
ルミナに変わっていた。As shown in FIG. 1, this monolith carrier 1 was placed in an electric furnace 3 with the exhaust gas inlet and outlet sides of the monolith carrier 1 closed with a heat insulating material 2, and fired at 1150°C. As a result, as shown in FIG. 2, T-alumina changes to α-alumina in the peripheral area 4 of the monolithic carrier 1, and remains as γ-alumina or partially changes to θ-alumina in the central area 5. was.
次いで、このモノリス担体ｌをジニトロジアンミン白金
水溶液に？ｉＪ−ｍし、引き上げて余分な水溶液を吹き
払い、乾燥、焼成した。続いて、塩化ロジウム水溶液に
浸漬し、引き上げて余分な水溶液を吹き払い、乾燥、焼
成した。この結果、白金とロジウムが担持されたモノリ
ス触媒Ａを得た。Next, this monolithic support l was added to a dinitrodiammine platinum aqueous solution. iJ-m, pulled up, blown off excess aqueous solution, dried, and fired. Subsequently, it was immersed in an aqueous rhodium chloride solution, pulled out, blown off excess aqueous solution, dried, and fired. As a result, monolithic catalyst A on which platinum and rhodium were supported was obtained.
このモノリス触媒Ａは、中央部５に触媒成分が多く担持
され、中央部５から周辺部４に向けて触媒成分担持量が
漸減していた。In this monolithic catalyst A, a large amount of the catalyst component was supported in the central portion 5, and the amount of catalyst component supported gradually decreased from the central portion 5 toward the peripheral portion 4.
（第２実施例）
第１実施例とモノリス担体ｌを用い、第３図に示すよう
な外管の内径Ｌｏｏｍ、内管の内径６０菖纏の２重管６
を、第４図に示すように、モノリス担体ｌの端面に当接
させ、周辺部（外管と内管の間）４にα−アルミナを主
成分とするスラリーを、そして中央部（内管の内側）５
にはＴ−アルミナを主成分とするスラリーを流入させ、
過剰分を気流により吹きとばした。乾燥後、７００’Ｃ
で焼成し、続いてこのモノリス担体１に第１実施例と同
様な方法で白金とロジウムを担持し、モノリス触媒Ｂを
得た。(Second Example) Using the first example and the monolithic carrier l, the inner diameter of the outer tube is Loom, the inner diameter of the inner tube is 60, and the double tube of the irises 6 is used as shown in FIG.
is brought into contact with the end surface of the monolithic carrier l, as shown in Fig. 4, and a slurry mainly composed of α-alumina is applied to the peripheral part (between the outer tube and the inner tube) 4, and the central part (between the inner tube and inside) 5
A slurry containing T-alumina as the main component is flowed into the
The excess was blown off by air current. After drying, 700'C
Subsequently, platinum and rhodium were supported on this monolithic carrier 1 in the same manner as in the first example to obtain a monolithic catalyst B.
このモノリス触媒Ｂは、中央部５に触媒成分が多く担持
され、周辺部４はごく僅かに担持されていた。In this monolithic catalyst B, a large amount of the catalyst component was supported in the central part 5, and a very small amount was supported in the peripheral part 4.
（比較例）
第１実施例と同じモノリス担体を用い、このモノリス触
媒のセル内壁面全体にγ−アルミナを被覆した後、実施
例と同様な操作で白金とロジウムを担持し触媒Ｃを得た
。(Comparative example) Using the same monolithic carrier as in the first example, the entire inner wall surface of the cell of this monolithic catalyst was coated with γ-alumina, and then platinum and rhodium were supported in the same manner as in the example to obtain catalyst C. .
上記実施例と比較例で得られた３℃Ｍのモノリス触媒Ａ
、Ｂ、Ｃを２７＋エンジンの排気系に取りつけ、排気ガ
スの導入温度を７００℃として２００時間耐久試験をお
こなった後、モノリス触媒を評価した。この評価は、モ
ノリス触媒への大ガス温度が３５，０℃のときの炭化水
素、−酸化炭素および窒素酸化物の浄化率を測定するこ
とにより行った。この結果を第１表に示す。3℃M monolithic catalyst A obtained in the above examples and comparative examples
, B, and C were attached to the exhaust system of a 27+ engine, and a 200-hour durability test was conducted at an exhaust gas introduction temperature of 700° C., and then the monolith catalyst was evaluated. This evaluation was performed by measuring the purification rate of hydrocarbons, -carbon oxides, and nitrogen oxides when the temperature of the large gas flowing into the monolithic catalyst was 35.0°C. The results are shown in Table 1.
第１表
但し、各モノリス触媒における触媒成分担持量はすべて
同じである。Table 1 However, the amount of catalyst components supported in each monolithic catalyst is the same.
第１表より明らかなように、本実施例により製造したモ
ノリス触媒は、従来の製造方法で得たモノリス触媒に比
べ、同一担持量でより高い浄化性能を示しているのが判
るゆ
また、本実施例のうち、特に第１実施例は、従来の焼成
工程において断熱材で蓋をする操作を加えるだけでよい
ため、従来のような周辺部を閉塞させる方法に比べ、極
めて容易かつ効率的であり作業性が向上する。As is clear from Table 1, the monolithic catalyst produced by this example shows higher purification performance with the same loading amount compared to the monolithic catalyst obtained by the conventional production method. Among the examples, the first example in particular is extremely easy and efficient compared to the conventional method of closing the peripheral area, because it is only necessary to add a lid with a heat insulating material during the conventional firing process. Improves work efficiency.
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. .
第１図は本発明の第１実施例の一工程を示す概略構成図
、
第２図は本発明の第１実施例で製造したモノリス担体の
概略断面図、
第３図は本発明の第２実施例で用いた２重管の断面図、
第４図は本発明の第２実施例の一工程を示す概略構成図
である。
Ｌ−−−−モノリス担体
２・・−・・・断熱材
３−・−−−一電気炉
４・＝・−周辺部
５−・〜中央部
６−・−・２重管
立；；２−人 １．ヨク口勤卑拌入会社第１図
２
第２図Fig. 1 is a schematic configuration diagram showing one step of the first embodiment of the present invention, Fig. 2 is a schematic sectional view of a monolithic carrier manufactured in the first embodiment of the present invention, and Fig. 3 is a schematic diagram showing a step of the monolithic carrier produced in the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the double pipe used in the embodiment. FIG. 4 is a schematic configuration diagram showing one step of the second embodiment of the present invention. L----Monolith carrier 2---Insulating material 3----Electric furnace 4---Peripheral part 5----Central part 6---Double pipe stand;;2 -People 1. Figure 1 2 Figure 2
Claims (1)
かって軸方向に多数のセルが設けられており、このセル
内壁面にアルミナ層が形成され、このアルミナ層に触媒
成分が担持されている排気ガス浄化用モノリス触媒の製
造方法であって、前記アルミナ層は、半径方向において
、中央部はＴ−アルミナもしくはθ−アルミナとし、か
つ周辺部はα−アルミナとした後、触媒成分を含有する
溶液に浸漬し、取り出して乾燥、焼成することを特徴と
する排気ガス浄化用モノリス触媒の製造方法。Tl) It has a columnar shape and has a large number of cells arranged in the axial direction from the exhaust gas inlet side to the outlet side, and an alumina layer is formed on the inner wall surface of the cell, and a catalyst component is supported on this alumina layer. A method for producing a monolithic catalyst for exhaust gas purification, wherein the alumina layer is made of T-alumina or θ-alumina in the center part and α-alumina in the peripheral part in the radial direction, and then contains a catalyst component. A method for producing a monolithic catalyst for exhaust gas purification, which comprises immersing the monolithic catalyst in a solution, taking it out, drying it, and firing it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59091660A JPS60235642A (en) | 1984-05-07 | 1984-05-07 | Preparation of monolithic catalyst for purifying exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59091660A JPS60235642A (en) | 1984-05-07 | 1984-05-07 | Preparation of monolithic catalyst for purifying exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60235642A true JPS60235642A (en) | 1985-11-22 |
Family
ID=14032646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59091660A Pending JPS60235642A (en) | 1984-05-07 | 1984-05-07 | Preparation of monolithic catalyst for purifying exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60235642A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62241552A (en) * | 1986-04-11 | 1987-10-22 | Cataler Kogyo Kk | Monolithic catalyst carrier for purifying exhaust gas |
| GB2363507A (en) * | 2000-04-10 | 2001-12-19 | Trevor Evan Parry | Multi-scale location maps. |
-
1984
- 1984-05-07 JP JP59091660A patent/JPS60235642A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62241552A (en) * | 1986-04-11 | 1987-10-22 | Cataler Kogyo Kk | Monolithic catalyst carrier for purifying exhaust gas |
| GB2363507A (en) * | 2000-04-10 | 2001-12-19 | Trevor Evan Parry | Multi-scale location maps. |
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