JPS63248446A - Exhaust gas purifying catalyst - Google Patents
Exhaust gas purifying catalystInfo
- Publication number
- JPS63248446A JPS63248446A JP62083343A JP8334387A JPS63248446A JP S63248446 A JPS63248446 A JP S63248446A JP 62083343 A JP62083343 A JP 62083343A JP 8334387 A JP8334387 A JP 8334387A JP S63248446 A JPS63248446 A JP S63248446A
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- catalyst
- exhaust gas
- silicon carbide
- 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
- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 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 52
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 abstract description 4
- 229910052763 palladium Inorganic materials 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract 1
- 238000010792 warming Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 18
- 238000000746 purification Methods 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 7
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010948 rhodium Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 229910052703 rhodium Inorganic materials 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 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
- 238000010304 firing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- OOYGSFOGFJDDHP-KMCOLRRFSA-N kanamycin A sulfate Chemical group OS(O)(=O)=O.O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N OOYGSFOGFJDDHP-KMCOLRRFSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、排気ガス浄化用触媒の改良に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in exhaust gas purification catalysts.
（従来技術とその問題点）
従来、排気ガス浄化用触媒としては、第４図（ａ）及び
第４図（ｂ）に略画的に示すように、触媒ケース！内に
設けられたハニカム状担体２の表面ニ、触媒成分（白金
、パラジウム、ロジウム等）を含有するアルミナコート
層が形成された触媒Ｂが知らされている（実開昭５９−
１９０９２５号参照）。(Prior art and its problems) Conventionally, as a catalyst for purifying exhaust gas, as shown schematically in FIGS. 4(a) and 4(b), a catalyst case! Catalyst B is known in which an alumina coating layer containing catalyst components (platinum, palladium, rhodium, etc.) is formed on the surface of the honeycomb-shaped carrier 2 provided therein (Utility Model Application No. 59-1999).
(See No. 190925).
ところで上記のような触媒Ｂにおいて、エンジンの冷間
始動時には、排気ガス量がさほど多くなく、排気ガスは
流動抵抗の比較的小さい担体２の −中心部分ａを集
中的に通過するので、第４図（ｃ）に実線で示すように
、中心部分ａの温度が高くなりやすいため、中心部分ａ
の排気ガス浄化性能は早期に良好となるが、担体２のア
ルミナコート層の熱伝導性が高くないことから、外周部
分すの温度が触媒の活性温度までなかなか上昇せず、し
たがって、外周部分すの排気ガス浄化性能が低下するこ
とになり、触媒全体としての排気ガス浄化性能（ウオー
ムアツプ性能）が悪くなるという問題があった７
（発明の目的）
本発明は上記従来の問題を解決するためになされたもの
で、担体のアルミナコート層の含有成分を工夫すること
により、コールド時における触媒全体としてのウオーム
アツプ性能を向上させることを目的とするものである。By the way, in the catalyst B as described above, when the engine is cold started, the amount of exhaust gas is not so large and the exhaust gas intensively passes through the -center part a of the carrier 2 where the flow resistance is relatively small. As shown by the solid line in Figure (c), since the temperature of the center part a tends to be high,
Although the exhaust gas purification performance of the catalyst improves quickly, since the thermal conductivity of the alumina coating layer of the carrier 2 is not high, the temperature of the outer circumferential portion does not easily rise to the activation temperature of the catalyst. There was a problem in that the exhaust gas purification performance of the catalyst deteriorated, and the exhaust gas purification performance (warm-up performance) of the catalyst as a whole deteriorated. The purpose is to improve the warm-up performance of the catalyst as a whole during cold conditions by modifying the components contained in the alumina coating layer of the carrier.
（発明の構成）
このため本発明は、触媒ケース内に設けられる担体の表
面に、触媒成分を含有するアルミナコート層が形成され
、該アルミナコート層に、アルミナよりも熱伝導性が高
い炭化珪素またはチタニアの少なくとも１種が含有され
ていることを特徴とするものである。(Structure of the Invention) Therefore, in the present invention, an alumina coat layer containing a catalyst component is formed on the surface of a carrier provided in a catalyst case, and the alumina coat layer is made of silicon carbide, which has higher thermal conductivity than alumina. Or, it is characterized by containing at least one type of titania.
上記炭化珪素またはチタニアは、アルミナコート層のア
ルミナに対して、６０〜７０重量％含有されていること
が好ましい。It is preferable that the silicon carbide or titania is contained in an amount of 60 to 70% by weight based on the alumina of the alumina coat layer.
また、上記炭化珪素またはチタニアは、上記担体の外周
部分に含有されるようにしてもよい。Further, the silicon carbide or titania may be contained in the outer peripheral portion of the carrier.
（発明の効果）
本発明によれば、担体のアルミナコート層に、熱伝導性
が高い炭化珪素またはチタニアの少なくとも１種が含有
されているから、担体の外周部分への熱伝導性が高まり
、外周部分の温度か短時間で高くなりやすいので排気ガ
ス浄化性能が良好となり、コールド時における触媒全体
としてのウオームアツプ性能が向上するようになる。(Effects of the Invention) According to the present invention, since the alumina coat layer of the carrier contains at least one of silicon carbide and titania, which have high thermal conductivity, the thermal conductivity to the outer peripheral portion of the carrier increases, Since the temperature of the outer circumferential portion tends to rise in a short period of time, the exhaust gas purification performance is improved, and the warm-up performance of the catalyst as a whole during cold conditions is improved.
（実施例）
以下、本発明の実施例を添付図面について詳細に説明す
る。(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第１図に示すように、本発明に係る排気ガス浄化用触媒
Ａは、触媒ケース内に設けられたハニカム状担体２の全
表面に、従来と同様な触媒成分（白金、パラジウム、ロ
ジウム等）が含有されると共に、アルミナよりも熱伝導
性が高い炭化珪素（ＳｉＣ）またはチタニア（ＴｉＯ，
）の少なくとも１種が含有されているアルミナコート層
３が形成されているものである。なお、アルミナコート
層３の厚みは３０〜５０μが適当である。As shown in FIG. 1, the exhaust gas purifying catalyst A according to the present invention has the same catalyst components (platinum, palladium, rhodium, etc.) as conventional ones on the entire surface of the honeycomb-shaped carrier 2 provided in the catalyst case. Silicon carbide (SiC) or titania (TiO,
) is formed with an alumina coat layer 3 containing at least one of the following. Note that the appropriate thickness of the alumina coat layer 3 is 30 to 50 μm.
ここで、担体（コージライト）、アルミナ、炭化珪素、
チタニアの熱伝導率を比較すると、第１表のようになる
。Here, the carrier (cordierite), alumina, silicon carbide,
Table 1 shows a comparison of the thermal conductivities of titania.
第１表
第１表からも明らかなように、炭化珪素またはチタニア
の熱伝導率はアルミナの約６倍であり、熱伝導性が高い
ことがわかる。As is clear from Table 1, the thermal conductivity of silicon carbide or titania is about 6 times that of alumina, indicating that it has high thermal conductivity.
従って、炭化珪素（またはチタニア）を含有するアルミ
ナコート層３が形成された担体２であれば、エンジンの
始動（コールド時）直後に、高温の排気ガスが担体２の
中心部分ａを通過することにより中心部分ａの温度が高
くなると、熱伝導性が高められたアルミナコート層３を
介して外周部分すの温度も短時間で高くなる、換言する
と触媒Ａ全体の温度分布が高温側で均一化するようにな
るのである（第４図（ｃ）の鎖線参照）。Therefore, if the carrier 2 is formed with an alumina coat layer 3 containing silicon carbide (or titania), high-temperature exhaust gas will pass through the center portion a of the carrier 2 immediately after starting the engine (when cold). When the temperature of the central portion a increases, the temperature of the outer peripheral portion also increases in a short time through the alumina coat layer 3 with increased thermal conductivity.In other words, the temperature distribution of the entire catalyst A becomes uniform on the high temperature side. (See the chain line in FIG. 4(c)).
次に実験データを説明する。Next, the experimental data will be explained.
まず、下記条件で触媒（テストピース）を製作した。First, a catalyst (test piece) was manufactured under the following conditions.
触媒サイズ： 直径４６Ｘ長さ７６ （ｍｍ）焼成条件
： 空気中で！０００℃×２４時間加熱
触媒成分： 白金／ロジウム＝ ７ ／ ３ ３ 、
ＯｇＩＱアルミナコート層： 担体に対して２１重量％
（従来触媒Ｂ： アルミナ（γ−ＡＣｚＯａ）（本発明
触媒Ａ： 炭化珪素／アルミナ＝７０／３０
この触媒Ａ、Ｂをそれぞれ下記の条件下のエンジンの排
気系に設置した。Catalyst size: Diameter 46 x length 76 (mm) Firing conditions: In air! Heated at 000°C for 24 hours Catalyst component: Platinum/Rhodium = 7/33,
OgIQ alumina coat layer: 21% by weight based on carrier
(Conventional catalyst B: alumina (γ-ACzOa) (present invention catalyst A: silicon carbide/alumina = 70/30) These catalysts A and B were each installed in the exhaust system of an engine under the following conditions.
ＳＶ（排気ガスの空間速度）：２３７００ｈ−’Ａ／Ｆ
（空燃比）： １４．７
その結果を第２図のグラフ（触媒のウオームアツプ性能
）に示す。なお、鎖線は触媒人口温度である。SV (exhaust gas space velocity): 23700h-'A/F
(Air-fuel ratio): 14.7 The results are shown in the graph of Figure 2 (warm-up performance of catalyst). Note that the chain line is the catalyst population temperature.
このグラフからも明らかなように、白丸を連らねた実線
で示す従来触媒Ｂでは、担体２のアルミナコート層の熱
伝導性が高くないことから、外周部分すの温度が短時間
で高くなりにくい結果、外周部分すの排気ガス浄化性能
が低下するので、エンジンの始動（コールド時）から約
１８０秒間のＨＣ浄化率は悪いが、黒丸を連らねた実線
で示す本発明触媒Ａでは、担体２のアルミナコート層３
の熱伝導性が高められていることから外周部分すの温度
が短時間で高くなりやすい結果、外周部分すの排気ガス
浄化性能も良好となるので、エンジンの始動（コールド
時）から約１８０秒間は、従来触媒Ｂに比べてＨＣ浄化
率、つまりウオームアツプ性能が向上していることがわ
かる。As is clear from this graph, in the conventional catalyst B shown by the solid line with white circles, the thermal conductivity of the alumina coating layer of the carrier 2 is not high, so the temperature of the outer peripheral portion increases in a short period of time. As a result, the exhaust gas purification performance of the outer peripheral portion decreases, so the HC purification rate for about 180 seconds after engine startup (when cold) is poor. Alumina coat layer 3 of carrier 2
As the thermal conductivity of the engine is increased, the temperature of the outer circumferential area easily rises in a short period of time, and as a result, the exhaust gas purification performance of the outer circumferential area is also good, so that the temperature of the outer circumferential area increases for about 180 seconds after the engine is started (when cold). It can be seen that the HC purification rate, that is, the warm-up performance, is improved compared to the conventional catalyst B.
上記実験では、本発明触媒Ａのアルミナコート層３に炭
化珪素のみを含有したものであったが、チタニア、ある
いは炭化珪素とチタニアの混合物を含有した場合でも同
様の結果が得られた。 また、上記実験では、炭化珪素
は、アルミナコート層のアルミナに対して７０重量％含
有したものであったが、６０〜７０重量％の範囲で含有
されていることが好ましい。In the above experiment, the alumina coat layer 3 of Catalyst A of the present invention contained only silicon carbide, but similar results were obtained even when titania or a mixture of silicon carbide and titania was contained. Further, in the above experiment, silicon carbide was contained in an amount of 70% by weight based on the alumina of the alumina coat layer, but it is preferably contained in a range of 60 to 70% by weight.
なぜなら、第３図のグラフ（触媒のウオームアツプ性能
）に示すように、炭化珪素が７０重量％以上であると、
アルミナに介在物が多く入ることになり、アルミナのポ
ーラスが潰れて表面積が減少し、触媒活性そのものの効
果が落ちることになる。This is because, as shown in the graph in Figure 3 (warm-up performance of catalyst), if silicon carbide is 70% by weight or more,
Many inclusions will enter the alumina, the pores of the alumina will be crushed, the surface area will decrease, and the effectiveness of the catalytic activity itself will be reduced.
逆に炭化珪素が６０重量％以下であると、熱伝導性能を
損うので、外周部分すの温度上昇が望めないからである
。On the other hand, if the silicon carbide content is 60% by weight or less, the heat conduction performance will be impaired, and it will not be possible to increase the temperature of the outer peripheral portion.
さらに、上記実験では、担体２のアルミナコート層３の
全体に炭化珪素を含有させたしのであったが、担体２の
外周部分すのアルミナコート層にのみ炭化珪素を含有さ
せてもよい。Further, in the above experiment, silicon carbide was contained in the entire alumina coat layer 3 of the carrier 2, but silicon carbide may be contained only in the alumina coat layer on the outer periphery of the carrier 2.
次に、本発明触媒Ａの製造方法を説明する。Next, a method for producing catalyst A of the present invention will be explained.
（１）炭化珪素（ＳｉＣ）もしくはチタニア（ＴｉＯｚ
）にアルミナ（γ−Ａ（ｂＯＪおよびベーマイト（γ−
Ａ１２２０ｓ・３Ｈ１）を７０／３０〜６０／４０の比
率で、総重量が２００ｇとなるように混合する。(1) Silicon carbide (SiC) or titania (TiOz
) to alumina (γ-A (bOJ) and boehmite (γ-
A1220s/3H1) are mixed in a ratio of 70/30 to 60/40 so that the total weight is 200 g.
（２）このアルミナフィラーに２４０ｃｃの水、■。(2) Add 240 cc of water to this alumina filler.
６ｃｃの硝酸（ＨＮ Ｏ、）を加えて、ラボスターラー
で５〜６時間の撹拌を行う。Add 6 cc of nitric acid (HNO, ) and stir in a lab stirrer for 5-6 hours.
（３）このアルミナスラリー液に、コージライト製担体
２を浸漬し、引き上げたのち、余分のスラリー液をエア
ブロ−で除去する。(3) After immersing the cordierite carrier 2 in this alumina slurry and pulling it up, the excess slurry is removed by air blowing.
（４）その後、１３０℃で１時間乾燥し、さらに５５０
℃で１５時間の焼成を行なう。(4) Then, dry at 130°C for 1 hour, and then dry at 550°C.
Calcination is carried out at ℃ for 15 hours.
（５）次に、この担体２を１８０ｃｃの水に１８ｇの硝
酸セリウム［Ｃｅ（ＮＯ３）３−６Ｈ，Ｏ］を溶解した
水溶液に浸漬したのち、乾燥・焼成を行なう。(5) Next, this carrier 2 is immersed in an aqueous solution of 18 g of cerium nitrate [Ce(NO3)3-6H,O] dissolved in 180 cc of water, and then dried and fired.
（６）最後に、この担体２を、所定の塩化白金ならびに
塩化ロジウム水溶液に浸漬したのち、１５０℃で３０分
乾燥し、５５０℃で１．５時間の焼成を行なって触媒Ａ
を得た。(6) Finally, this carrier 2 was immersed in a predetermined aqueous solution of platinum chloride and rhodium chloride, dried at 150°C for 30 minutes, and calcined at 550°C for 1.5 hours.
I got it.
（７）焼成後のアルミナコート層のアルミナ量は、担体
重量に対して２１重量％、酸化セリウム（ＣｅＯ７）は
アルミナコート層のアルミナに対して６重量％、Ｐｔ担
持量：２．Ｉｇ／４ 、Ｒｈ担持量：０．９ｇ／Ｑであ
る。(7) The amount of alumina in the alumina coat layer after firing is 21% by weight based on the carrier weight, cerium oxide (CeO7) is 6% by weight based on the alumina in the alumina coat layer, and the amount of Pt supported: 2. Ig/4, Rh supported amount: 0.9 g/Q.
従来触媒Ｂの製造方法は本発明触媒Ａの製造方法（ＩＯ
２）に代えて、下記方法を採用した。なお、（３）〜（
７）は全く同じである。アルミナ（γ−ＡＱ＊０ａ）１
００ｇ、ベートマイト（Ａ（２ｔＯｓ・３Ｈｚ）１００
ｇに２４０ｃｃの水、１．６ｃｃの硝酸（ＨＮ Ｏ３）
を加えて、ホモミキサーで５時間混合撹拌を行う。The conventional method for producing catalyst B is the method for producing catalyst A of the present invention (IO
In place of 2), the following method was adopted. In addition, (3) ~ (
7) are exactly the same. Alumina (γ-AQ*0a) 1
00g, batemite (A (2tOs・3Hz) 100
g, 240cc of water, 1.6cc of nitric acid (HN O3)
and mix with a homomixer for 5 hours.
第３図に示した炭化珪素とアルミナの含有比の異なる触
媒（テストピース）の製造方法は、本発明触媒Ａの製造
方法（１）において、比率を変えた。The method for producing catalysts (test pieces) with different content ratios of silicon carbide and alumina shown in FIG. 3 is the method for producing catalyst A of the present invention (1) with different ratios.
なお（２）〜（７）は全く同じである。Note that (2) to (7) are exactly the same.
第１図は本発明に係る担体とアルミナコート層の正面拡
大断面図、第２図は触媒のウオームアツプ性能を示すグ
ラフ、第３図は炭化珪素とアルミナの含有比とウオーム
アツプ性能との関係を示すグラフ、第４図（ａ）は従来
の触媒の側面断面図、第４図（ｂ）は第４図（ａ）の正
面断面図、第４図（ｃ）は担体の温度分布を示すグラフ
である。
Ｉ・・・触媒ケース、２・・・担体
３・・・アルミナコート層、Ａ・・・触媒。
第１図
箪２図
噴量（砂）
第３図Fig. 1 is an enlarged front sectional view of the carrier and alumina coat layer according to the present invention, Fig. 2 is a graph showing the warm-up performance of the catalyst, and Fig. 3 is the relationship between the content ratio of silicon carbide and alumina and the warm-up performance. FIG. 4(a) is a side sectional view of a conventional catalyst, FIG. 4(b) is a front sectional view of FIG. 4(a), and FIG. 4(c) shows the temperature distribution of the carrier. It is a graph. I...Catalyst case, 2...Carrier 3...Alumina coat layer, A...Catalyst. Figure 1 Kano Figure 2 Ejection volume (sand) Figure 3
Claims (3)
分を含有するアルミナコート層が形成され、該アルミナ
コート層に、アルミナよりも熱伝導性が高い炭化珪素ま
たはチタニアの少なくとも１種が含有されていることを
特徴とする排気ガス浄化用触媒。(1) An alumina coat layer containing catalyst components is formed on the surface of the carrier provided in the catalyst case, and the alumina coat layer contains at least one of silicon carbide or titania, which has higher thermal conductivity than alumina. An exhaust gas purifying catalyst characterized by:
層のアルミナに対して、６０〜７０重量％含有されてい
ることを特徴とする特許請求の範囲第（１）項記載の排
気ガス浄化用触媒。(2) The exhaust gas purifying catalyst according to claim (1), wherein the silicon carbide or titania is contained in an amount of 60 to 70% by weight based on the alumina of the alumina coat layer.
部分に含有されていることを特徴とする特許請求の範囲
第（１）項記載の排気ガス浄化用触媒。(3) The exhaust gas purifying catalyst according to claim (1), wherein the silicon carbide or titania is contained in the outer peripheral portion of the carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62083343A JPS63248446A (en) | 1987-04-04 | 1987-04-04 | Exhaust gas purifying catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62083343A JPS63248446A (en) | 1987-04-04 | 1987-04-04 | Exhaust gas purifying catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63248446A true JPS63248446A (en) | 1988-10-14 |
Family
ID=13799792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62083343A Pending JPS63248446A (en) | 1987-04-04 | 1987-04-04 | Exhaust gas purifying catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63248446A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS621457A (en) * | 1985-06-26 | 1987-01-07 | Toyota Motor Corp | Preparation of catalyst for purifying exhaust gas |
-
1987
- 1987-04-04 JP JP62083343A patent/JPS63248446A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS621457A (en) * | 1985-06-26 | 1987-01-07 | Toyota Motor Corp | Preparation of catalyst for purifying exhaust gas |
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