JP3327574B2 - Automotive exhaust gas purification catalyst - Google Patents
Automotive exhaust gas purification catalystInfo
- Publication number
- JP3327574B2 JP3327574B2 JP10940692A JP10940692A JP3327574B2 JP 3327574 B2 JP3327574 B2 JP 3327574B2 JP 10940692 A JP10940692 A JP 10940692A JP 10940692 A JP10940692 A JP 10940692A JP 3327574 B2 JP3327574 B2 JP 3327574B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- catalyst
- carrier
- exhaust gas
- alumina
- 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 - Fee Related
Links
- 239000003054 catalyst Substances 0.000 title claims description 39
- 238000000746 purification Methods 0.000 title description 2
- 229910052751 metal Inorganic materials 0.000 claims description 34
- 239000002184 metal Substances 0.000 claims description 34
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 27
- 239000010410 layer Substances 0.000 claims description 25
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 17
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 16
- 239000010948 rhodium Substances 0.000 claims description 12
- 229910052697 platinum Inorganic materials 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 8
- 229910052763 palladium Inorganic materials 0.000 claims description 8
- 229910052703 rhodium Inorganic materials 0.000 claims description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 229910052684 Cerium Inorganic materials 0.000 claims description 5
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 4
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 17
- 239000011888 foil Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000002585 base Substances 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052809 inorganic oxide Inorganic materials 0.000 description 3
- 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
- 238000011156 evaluation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 rare earth compound Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 150000001341 alkaline earth metal compounds Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は金属製ハニカム担体の基
材である金属箔の伸びが抑制され、優れた触媒性能を示
す自動車排ガス浄化用触媒に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst for purifying automobile exhaust gas, which exhibits excellent catalytic performance by suppressing expansion of a metal foil as a base material of a metallic honeycomb carrier.
【0002】[0002]
【従来の技術】従来、自動車のような内燃機関から排出
される排気ガスの浄化用触媒は、多数提案されており、
現在では、炭化水素(HC)、一酸化炭素(CO)およ
び窒素酸化物(NOx )を同時に浄化する三元触媒が主
流となつている。2. Description of the Related Art Conventionally, many catalysts for purifying exhaust gas discharged from an internal combustion engine such as an automobile have been proposed.
At present, three-way catalysts for purifying hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO x ) at the same time have become mainstream.
【0003】上記の三元触媒は、アルミナ、アルミナ−
シリカ、シリカ等の耐火性無機酸化物粉体に、白金(P
t)、パラジウム(Pd)、ロジウム(Rh)等の触媒
成分を単独で、あるいは組み合わせて分散担持してなる
触媒組成物を、コ−ジエライトや金属製等のハニカム担
体に被覆せしめてなるものや、コ−ジエライトや金属製
等のハニカム担体に、アルミナ、アルミナ−シリカ、シ
リカ等の耐火性無機酸化物を被覆した後、該担体を、白
金(Pt)、パラジウム(Pd)、ロジウム(Rh)等
の触媒成分を単独あるいは組み合わせたものの水溶液に
浸漬することによりこれらの触媒成分を担持せしめてな
るものが一般的である。[0003] The above three-way catalysts include alumina, alumina-
Platinum (P) is used for refractory inorganic oxide powders such as silica and silica.
t), a catalyst composition obtained by dispersing and supporting a catalyst component such as palladium (Pd) or rhodium (Rh) alone or in combination with a honeycomb carrier made of cordierite or metal, or the like. After coating a refractory inorganic oxide such as alumina, alumina-silica or silica on a honeycomb carrier such as cordierite or metal, the carrier is coated with platinum (Pt), palladium (Pd), rhodium (Rh). Such catalyst components are generally supported by immersing the catalyst components alone or in combination in an aqueous solution.
【0004】さらに、触媒成分の白金(Pt)、パラジ
ウム(Pd)、ロジウム(Rh)等の貴金属の触媒作用
を促進させたり、安定化させるために、セリウム(C
e)、ランタン(La)等の希土類化合物、ニッケル
(Ni)、鉄(Fe)等の第VIII族化合物、アルカリ金
属化合物およびアルカリ土類金属化合物などから選ばれ
たものが、助触媒成分として触媒組成物に添加されてい
る。Further, in order to promote or stabilize the catalytic action of a noble metal such as platinum (Pt), palladium (Pd), rhodium (Rh) as a catalyst component, cerium (C) is used.
e), a rare earth compound such as lanthanum (La), a group VIII compound such as nickel (Ni) or iron (Fe), an alkali metal compound, an alkaline earth metal compound, or the like; It has been added to the composition.
【0005】[0005]
【発明が解決しようとする課題】上記のような従来の触
媒のうち金属製等のハニカム担体を用いる触媒は、高温
時の金属製担体とアルミナ等の耐火性無機酸化物との熱
膨脹の違いにより、金属製等のハニカム担体の基材であ
る金属箔上のコ−ト層が剥離し、触媒性能が低下すると
いう問題点があつた。Among the above-mentioned conventional catalysts, the catalyst using a honeycomb carrier made of metal or the like is characterized by a difference in thermal expansion between the metal carrier and a refractory inorganic oxide such as alumina at a high temperature. In addition, there has been a problem that a coat layer on a metal foil which is a base material of a honeycomb carrier made of metal or the like is peeled off, and the catalytic performance is lowered.
【0006】本発明は、かかる従来の問題点を解決し、
高温時に金属製ハニカム担体の基材である金属箔の酸化
に伴う伸びが抑制されて金属箔上のコート層の剥離を生
ぜず、炭化水素(HC)、一酸化炭素(CO)および窒
素酸化物(NOx )を同時に浄化し得る触媒性能に優れ
た三元触媒を提供することを目的としている。[0006] The present invention solves such a conventional problem,
Oxidation of metal foil as base material of metal honeycomb carrier at high temperature
With excellent catalytic performance that can simultaneously purify hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NO x ) without suppressing the elongation of the coating layer on the metal foil and exfoliating the coating layer on the metal foil. It is intended to provide a source catalyst.
【0007】[0007]
【課題を解決するための手段】本発明は上記目的を達成
するためになされたものであって、本発明の自動車排ガ
ス浄化用触媒は、金属製ハニカム担体触媒において、金
属製ハニカム担体における高温にさらされる部分である
排ガス出口側部分および/または中央部分のみ、担体基
材と接触する一層目のコート層をアルカリ金属および/
またはアルカリ土類金属を含有するアルミナ層とする
か、この部分のみ、該コート層を前記金属を含有する厚
いアルミナ層とし、さらに該コート層の形成された担体
に、白金(Pt)、パラジウム(Pd)、ロジウム(R
h)、セリウム(Ce)、ランタン(La)、ジルコニ
ウム(Zr)、ニッケル(Ni)、鉄(Fe)およびバ
リウム(Ba)から選ばれた少なくとも一種の触媒成分
を含有するアルミナ層をコートしてなることを特徴とす
る。Means for Solving the Problems The present invention has been made to achieve the above object, and a catalyst for purifying automobile exhaust gas according to the present invention is a metal honeycomb carrier catalyst which can be used at a high temperature in a metal honeycomb carrier. It is the part that is exposed
Only the exhaust gas outlet side portion and / or the central portion is made of an alkali metal and / or
Alternatively, an alumina layer containing an alkaline earth metal, or only this portion, the coating layer is a thick alumina layer containing the metal, and the carrier on which the coating layer is formed is further provided with platinum (Pt), palladium ( Pd), rhodium (R
h) coating an alumina layer containing at least one catalyst component selected from cerium (Ce), lanthanum (La), zirconium (Zr), nickel (Ni), iron (Fe) and barium (Ba). It is characterized by becoming.
【0008】本発明の排ガス浄化用触媒において、高温
にさらされる部分における担体基材と接触する一層目の
アルミナコ−ト層、または厚いアルミナコ−ト層に含有
されるアルカリ金属としては、カリウム(K)等が好ま
しく、またアルカリ土類金属としては、カルシウム(C
a)、ストロンチウム(Sr)、バリウム(Ba)等が
好ましい。また、アルミナ層としては、活性アルミナ
層、α−アルミナ層等が用いられる。In the exhaust gas purifying catalyst of the present invention, potassium (K) is used as the alkali metal contained in the first alumina coat layer or the thick alumina coat layer which comes into contact with the carrier substrate in the portion exposed to high temperatures. ) And the like, and as the alkaline earth metal, calcium (C
a), strontium (Sr), barium (Ba) and the like are preferable. Further, as the alumina layer, an activated alumina layer, an α-alumina layer or the like is used.
【0009】また、本発明の触媒における高温にさらさ
れる部分(高温部分)とは、図1に示す金属製ハニカム
担体1の排ガス出口側部分2および/または図2に示す
金属製ハニカム担体1の中央部分3である。なお図1お
よび図2において4は排ガスをあらわす。The portion of the catalyst of the present invention which is exposed to high temperature (high temperature portion) is the portion 2 of the metal honeycomb carrier 1 shown in FIG. 1 on the exhaust gas outlet side and / or the portion of the metal honeycomb carrier 1 shown in FIG. The central part 3. In FIGS. 1 and 2, reference numeral 4 denotes exhaust gas.
【0010】[0010]
【作用】本発明において、金属箔の伸びが抑制されるメ
カニズムは明らかではないが、金属製ハニカム担体の高
温にさらされる部分のみ、担体基材と接触する一層目の
コ−ト層をアルカリ金属および/またはアルカリ土類金
属を含有したアルミナ層とするか、この部分のみ、該コ
−ト層を前記金属を含有する厚いアルミナ層とすること
によつて、担体基材である金属箔の伸びを抑制すること
ができる。すなわち、排ガスが触媒中を通過することに
よつて、温度分布が生じ、高温部と低温部では金属箔の
伸びの程度が異なり、高温部における伸びは大きいの
で、高温にさらされる部分のみ担体基材と接触する一層
目のコ−ト層を前記金属を含有するアルミナ層とする
か、または前記金属を含有する厚いアルミナ層とし、伸
びる力のバランスをとることによつて、高温時における
金属箔の伸びを抑制することができる。しかして、本発
明の触媒においては、さらに上記のコ−ト層の形成され
た担体上に上記の触媒成分を含有させたアルミナ層をコ
−トし、自動車排ガス浄化用触媒としての機能を付与さ
せている。In the present invention, although the mechanism by which the elongation of the metal foil is suppressed is not clear, only the portion of the metal honeycomb carrier exposed to high temperature is coated with the first coat layer in contact with the carrier substrate with an alkali metal. And / or forming an alumina layer containing an alkaline earth metal, or only this part of the coat layer as a thick alumina layer containing the metal, to elongate the metal foil as the carrier substrate. Can be suppressed. That is, as the exhaust gas passes through the catalyst, a temperature distribution occurs, and the degree of elongation of the metal foil differs between the high-temperature part and the low-temperature part, and the elongation in the high-temperature part is large. By forming the first coat layer in contact with the material as an alumina layer containing the metal or a thick alumina layer containing the metal and balancing the stretching force, the metal foil at a high temperature can be obtained. Elongation can be suppressed. Thus, in the catalyst of the present invention, an alumina layer containing the above-mentioned catalyst component is further coated on the carrier on which the above-mentioned coat layer has been formed, thereby imparting a function as a catalyst for purifying automobile exhaust gas. Let me.
【0011】[0011]
実施例1 直径80mm、長さ105mmの金属製ハニカム担体
(図1および図2に示す1)に、Caを含む活性アルミ
ナスラリ−をまず全体に均一にコ−トし、300℃で焼
成した(コ−ト量30g)。さらに、同スラリ−を担体
の排ガス出口側部分(図1に示す2の部分)に30mm
の幅でコ−トし、この部分における担体基材と接触する
一層目のコ−ト層を厚くし、300℃で焼成した(全コ
−ト量40g)。Example 1 First, an activated alumina slurry containing Ca was coated uniformly on a metal honeycomb carrier (1 shown in FIGS. 1 and 2) having a diameter of 80 mm and a length of 105 mm, and fired at 300 ° C. (Coat amount: 30 g). Further, the slurry was applied to the exhaust gas outlet side portion (portion 2 shown in FIG. 1) of the carrier by 30 mm.
The thickness of the first coat layer in contact with the carrier substrate in this portion was increased and calcined at 300 ° C. (total coat amount: 40 g).
【0012】上記のコ−ト層の形成された担体に、C
e、La、Zrを含有する活性アルミナスラリ−をコ−
トし、600℃で焼成した(全コ−ト量240g)。こ
れに、さらにPt、Pd、Rhをそれぞれ、0.2,
0.4,0.1g担持し、触媒Aを調製した。The carrier on which the above-mentioned coating layer is formed has C
e, activated alumina slurry containing La, Zr
And baked at 600 ° C. (total coat weight 240 g). Further, Pt, Pd, and Rh are respectively 0.2,
Catalyst A was prepared by supporting 0.4 and 0.1 g.
【0013】実施例2 実施例1と同様の金属製ハニカム担体の中央部分[図2
に示す3の部分(直径50mm)]のみに、Caを含む
活性アルミナスラリ−をコ−トし、この部分における担
体基材と接触する一層目のコ−ト層を、Caを含有する
アルミナ層とし、300℃で焼成した(コ−ト量15
g)。以下、実施例1と同様にして、担体にCe、L
a、Zrを含有する活性アルミナをコ−トした後、焼成
し(全コ−ト量200g)、これに、さらにPt、P
d、Rhを担持し、触媒Bを調製した。Embodiment 2 A central portion of a metal honeycomb carrier similar to that of Embodiment 1 [FIG.
The active alumina slurry containing Ca is coated only on the portion 3 (diameter 50 mm) shown in (1), and the first coat layer in contact with the carrier substrate in this portion is replaced with the alumina layer containing Ca. And calcined at 300 ° C. (coat amount 15
g). Thereafter, in the same manner as in Example 1, Ce and L were added to the carrier.
After the activated alumina containing a and Zr was coated, it was calcined (total coating amount: 200 g), and further added with Pt and Pt.
Catalyst B was prepared by supporting d and Rh.
【0014】実施例3 実施例1と同様の金属製ハニカム担体の全体にCaを含
む活性アルミナスラリ−を均一にコ−トし300℃で焼
成した(コ−ト量30g)。つぎに、実施例1と同様に
して、担体の排ガス出口側部分に30mmの幅で同スラ
リ−をコ−トし、焼成した(全コ−ト量40g)。さら
に、実施例2と同様にして、担体の中央部分に同スラリ
−をコ−トし、焼成した(全コ−ト量55g)。Example 3 An active alumina slurry containing Ca was uniformly coated on the entire metallic honeycomb carrier as in Example 1 and fired at 300 ° C. (coat amount: 30 g). Next, in the same manner as in Example 1, the slurry was coated on the exhaust gas outlet side portion of the carrier with a width of 30 mm and fired (total coating amount: 40 g). Further, in the same manner as in Example 2, the same slurry was coated on the center portion of the carrier and calcined (total coating amount: 55 g).
【0015】上記コ−ト層の形成された担体に、以下、
実施例1と同様にして、Ce、La、Zrを含む活性ア
ルミナスラリ−をコ−トした後、焼成し(全コ−ト量1
55g)、これに、さらにPt、Pd、Rhを担持し、
触媒Cを調製した。The carrier on which the coating layer has been formed is described below.
In the same manner as in Example 1, an activated alumina slurry containing Ce, La, and Zr was coated and calcined (total coat amount 1).
55g), which further carries Pt, Pd, Rh,
Catalyst C was prepared.
【0016】比較例1 実施例1と同様の金属製ハニカム担体に、Ce、La、
Zrを含む活性アルミナスラリ−をコ−トし、600℃
で焼成した(コ−ト量100g)。これに、さらにP
t、Pd、Rhを実施例1と同様にして担持し、触媒D
を調製した。Comparative Example 1 A metallic honeycomb carrier similar to that of Example 1 was prepared by adding Ce, La,
Activated alumina slurry containing Zr is coated at 600 ° C.
(Coat amount 100 g). In addition, P
t, Pd, and Rh were supported in the same manner as in Example 1, and the catalyst D
Was prepared.
【0017】実施例1〜3および比較例1において調製
した触媒A〜Dを排気量が4000ccのエンジンに取
り付け、A/F=14.6(理論空燃比すなわちストイ
キ)、入ガス温度900℃、の条件で50時間耐久試験
をおこなつた。The catalysts A to D prepared in Examples 1 to 3 and Comparative Example 1 were attached to an engine having a displacement of 4000 cc, A / F = 14.6 (stoichiometric air-fuel ratio, ie, stoichiometric), an inlet gas temperature of 900 ° C., A 50-hour endurance test was performed under the following conditions.
【0018】耐久後の各触媒について浄化性能を評価し
た。評価は、排気量が2000ccのエンジンでA/F
=14.6(ストイキ)、入ガス温度460℃、の条件
でおこなつた。下記の表1に触媒A〜Dについての評価
結果を示した。The purification performance of each of the catalysts after the endurance was evaluated. Evaluation is A / F with 2000cc engine
= 14.6 (stoichiometric), and the input gas temperature was 460 ° C. Table 1 below shows the evaluation results of the catalysts A to D.
【0019】[0019]
【表1】 [Table 1]
【0020】[0020]
【発明の効果】本発明の自動車排ガス浄化用触媒におい
ては、金属製ハニカム担体の基材である金属箔の伸びが
高温において抑制される結果、金属箔上のコ−ト層が剥
離し触媒性能が低下することがない。したがつて本発明
の触媒(触媒A〜C)は、上記の表1に示すように、従
来の触媒(触媒D)と比べて触媒性能に優れている。According to the catalyst for purifying automobile exhaust gas of the present invention, the elongation of the metal foil, which is the base material of the metal honeycomb carrier, is suppressed at a high temperature. Does not decrease. Therefore, as shown in Table 1 above, the catalysts of the present invention (catalysts A to C) are superior in catalytic performance to the conventional catalyst (catalyst D).
【図1】本発明の触媒にいて高温にさらされる部分であ
る金属製ハニカム担体の排ガス出口側部分を示す説明
図。FIG. 1 is an explanatory view showing an exhaust gas outlet side portion of a metal honeycomb carrier which is a portion exposed to a high temperature in a catalyst of the present invention.
【図2】本発明の触媒において高温にさらされる部分で
ある金属製ハニカム担体の中央部分を示す説明図。FIG. 2 is an explanatory view showing a central portion of a metal honeycomb carrier which is a portion exposed to a high temperature in the catalyst of the present invention.
1…金属製ハニカム担体、2…担体の排ガス出口側部分
(高温部分)、3…担体の中央部分(高温部分)、4…
排ガス。DESCRIPTION OF SYMBOLS 1 ... Metal honeycomb support, 2 ... Exhaust gas outlet side part (high temperature part), 3 ... Central part of carrier (high temperature part), 4 ...
Exhaust gas.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平井 章雅 静岡県小笠郡大東町千浜7800番地 キャ タラー工業株式会社内 (72)発明者 高田 登志広 愛知県豊田市トヨタ町1番地 トヨタ自 動車株式会社内 (56)参考文献 特開 平2−194842(JP,A) 特開 平3−38250(JP,A) 特開 平4−265155(JP,A) (58)調査した分野(Int.Cl.7,DB名) B01J 21/00 - 37/36 B01D 53/86 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akimasa Hirai 7800 Chihama, Oto-cho, Ogasa-gun, Shizuoka Prefecture Inside Cataler Industry Co., Ltd. (72) Inventor Toshihiro Takada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor (56) References JP-A-2-194842 (JP, A) JP-A-3-38250 (JP, A) JP-A-4-265155 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B01J 21/00-37/36 B01D 53/86
Claims (1)
製ハニカム担体における高温にさらされる部分である排
ガス出口側部分および/または中央部分のみ、担体基材
と接触する一層目のコート層をアルカリ金属および/ま
たはアルカリ土類金属を含有するアルミナ層とするか、
この部分のみ、該コート層を前記金属を含有する厚いア
ルミナ層とし、さらに、該コート層の形成された担体
に、白金、パラジウム、ロジウム、セリウム、ランタ
ン、ジルコニウム、ニッケル、鉄およびバリウムから選
ばれた少なくとも一種の触媒成分を含有するアルミナ層
をコートしてなることを特徴とする自動車排ガス浄化用
触媒。1. A metal honeycomb carrier catalyst, which is a part of the metal honeycomb carrier that is exposed to a high temperature.
Only the gas outlet side part and / or the central part , the first coat layer in contact with the carrier substrate is an alumina layer containing an alkali metal and / or an alkaline earth metal,
Only in this portion, the coating layer is a thick alumina layer containing the metal, and the carrier on which the coating layer is formed is further selected from platinum, palladium, rhodium, cerium, lanthanum, zirconium, nickel, iron and barium. An automotive exhaust gas purifying catalyst comprising an alumina layer containing at least one catalyst component.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10940692A JP3327574B2 (en) | 1992-04-28 | 1992-04-28 | Automotive exhaust gas purification catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10940692A JP3327574B2 (en) | 1992-04-28 | 1992-04-28 | Automotive exhaust gas purification catalyst |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05305242A JPH05305242A (en) | 1993-11-19 |
JP3327574B2 true JP3327574B2 (en) | 2002-09-24 |
Family
ID=14509444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10940692A Expired - Fee Related JP3327574B2 (en) | 1992-04-28 | 1992-04-28 | Automotive exhaust gas purification catalyst |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3327574B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20030038035A (en) * | 2001-11-08 | 2003-05-16 | 현대자동차주식회사 | A system for the three way catalytic aftertreatment of gasoline automotive emissions |
CN115254103B (en) * | 2022-07-28 | 2024-02-02 | 湖北航特科技有限责任公司 | Tail gas purifying catalyst and preparation method thereof |
-
1992
- 1992-04-28 JP JP10940692A patent/JP3327574B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH05305242A (en) | 1993-11-19 |
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