JPS58146441A - Catalyst for purification of exhaust gas - Google Patents
Catalyst for purification of exhaust gasInfo
- Publication number
- JPS58146441A JPS58146441A JP57027455A JP2745582A JPS58146441A JP S58146441 A JPS58146441 A JP S58146441A JP 57027455 A JP57027455 A JP 57027455A JP 2745582 A JP2745582 A JP 2745582A JP S58146441 A JPS58146441 A JP S58146441A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- alumina
- alumina layer
- exhaust gas
- purification
- 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 64
- 238000000746 purification Methods 0.000 title claims abstract description 18
- 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 41
- 230000000694 effects Effects 0.000 abstract description 7
- 229910018967 Pt—Rh Inorganic materials 0.000 abstract description 6
- 229910052703 rhodium Inorganic materials 0.000 abstract description 5
- 229910052763 palladium Inorganic materials 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 229910052697 platinum Inorganic materials 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract 1
- 239000010948 rhodium Substances 0.000 description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 239000002002 slurry Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 6
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 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 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 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 3
- 239000012153 distilled water Substances 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- FCUFAHVIZMPWGD-UHFFFAOYSA-N [O-][N+](=O)[Pt](N)(N)[N+]([O-])=O Chemical compound [O-][N+](=O)[Pt](N)(N)[N+]([O-])=O FCUFAHVIZMPWGD-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 229910000033 sodium borohydride Inorganic materials 0.000 description 2
- 239000012279 sodium borohydride Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 241000283973 Oryctolagus cuniculus Species 0.000 description 1
- 241000270666 Testudines Species 0.000 description 1
- 241000270708 Testudinidae Species 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N hydrochloric acid Substances Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000002940 palladium Chemical class 0.000 description 1
- -1 platinum group metals Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
Abstract
Description
【発明の詳細な説明】
本発明は内燃機関の排気ガス浄化用触媒に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalyst for purifying exhaust gas of an internal combustion engine.
内燃機関特に自動車の排気ガス浄化用触媒は。Catalysts for purifying exhaust gas from internal combustion engines, especially automobiles.
耐久性、浄化性能等極めて高度な性能が要求されている
。従来、自動車の排気ガス中に含まれる００ 、ＨＣ，
ＮＯｘ等の有害成分を同時に除去するために有効な成分
として、白金（Ｐｔ）＆パラジウム（Ｐｄ入ロジウム（
Ｒｈ）等の白金族金属を単独あるいは組合わせて担持し
た触媒が比較的優れ友浄化性能を有するとされ、なかで
４総合性症の優れたＦ’ｔ−Ｆｌｈ系触媒が広く用いら
れている。しかし、これらＰｔ−Ｒｈ系触媒は高価格の
ため１価格的Ｋ １／２〜１／”Ｉと安いＰｅＬｌｐｔ
の替わりに用いたＰｔ −Ｒ１−Ｒｈ系あるいはＰａ−
＆系触媒の検討が近年進められて−る。Ｐｔ−Ｒ１−Ｒ
ｈ系触媒あるいはＰａ −Ｒｈ系触媒は、ｐｔ−ｈ系触
ＪＩＫ比べ酸化雰囲気における劣化が少なめ浄化開始温
度が゛低い等の長所がある反面、還元雰囲気で劣化が著
しい。Extremely high performance such as durability and purification performance is required. Conventionally, 00, HC,
Platinum (Pt) and palladium (Rhodium containing Pd) are effective ingredients for simultaneously removing harmful components such as NOx.
Catalysts supporting platinum group metals such as Rh) singly or in combination are said to have relatively good purification performance, and among them, F't-Flh catalysts, which have excellent 4-synthetic symptoms, are widely used. . However, these Pt-Rh catalysts are expensive, and the price of K1/2 to 1/''I is low.
Pt-R1-Rh system or Pa-
Research on & type catalysts has been progressing in recent years. Pt-R1-R
H-type catalysts or Pa-Rh-type catalysts have advantages such as less deterioration in oxidizing atmospheres and a lower purification start temperature than pt-h type catalysts, but on the other hand, they deteriorate significantly in reducing atmospheres.
Ｐ、？ｂ等の被毒に弱−、Ｐｔ ＋ Ｒｈ Ｋ対して相
互作用がろりｈおよびｈの性能を打ち消すような挙動を
示すことがある等の欠点があり、これらの欠点を改良し
た触媒の出現が望まれていた。P.? It has drawbacks such as being weakly resistant to poisoning such as Pt + Rh, and the interaction with Pt + Rh K may cancel out the performance of h and h, and it is hoped that a catalyst that improves these drawbacks will emerge. It was wanted.
本発明に、Ｐａがとあるいは比と共存することＫよる相
互作用をな（１，、Ｐａ−Ｒｈ系触媒あるいは、Ｐｔ
−Ｐａ−Ｒｈ系触媒の浄化性能全向上させた排気ガス浄
化用１！ｉｌ媒を提供することを目的とする。In the present invention, the interaction due to K (1, Pa-Rh-based catalyst or Pt
- Exhaust gas purification 1 with completely improved purification performance of Pa-Rh catalyst! The purpose is to provide an il medium.
この目的？４成するためｒｃｋ本発明の排気ガス浄化相
触鍼においては、ハニカム形状の触媒孔体上ＫＰａとＰ
ｔｈ）ｂとが各々別の層に分離して担持されている。具
俸的ＩＣ１ｊ、＄１因に示すようにハニカム形状の触媒
担体ｌ上に下層として抛を宮南するアルミナ層２が形成
され、当該ヂルミナ層上Ｋ Ｐｔ −＆ ｔＢるいはＲ
ｈｏ含有するアルミナ層３が形成されている触媒、また
は、第２図に示すように、ハニカム形状の触媒担体ｌ上
に下層としてＰｔ−ＦｌｈあるいはＲｈｏ含有するアル
ミナ１ｍ ３が形成され・、当該アルミナ層上［Ｐａ
ｔ＝金含有るアルミナ層２が形成・されている触媒から
成っている。This purpose? In order to form 4 rck in the exhaust gas purification contact needle of the present invention, KPa and P on the honeycomb-shaped catalyst pore body are
th)b are supported separately in separate layers. As shown in FIG. 1, an alumina layer 2 with an alumina layer is formed as a lower layer on a honeycomb-shaped catalyst carrier l, and K Pt - & tB or R on the alumina layer.
A catalyst on which an alumina layer 3 containing HO is formed, or as shown in FIG. On the layer [Pa
t=consists of a catalyst on which a gold-containing alumina layer 2 is formed.
そしてこのように別の層として形成されることに工りＰ
ａとａあるいはｈとの相互作用がなくなり、浄化性能が
向上される。また１本発明の触媒によれば、玉系触媒の
ｔ＃！ｊ徴とＰｔ−Ｒｈ系触媒の特徴とｔ兼ね備えた触
媒が得られる。And it is interesting that it is formed as a separate layer like this.
The interaction between a and a or h is eliminated, and the purification performance is improved. Furthermore, according to the catalyst of the present invention, the t# of the ball type catalyst! A catalyst can be obtained that has both the characteristics of the Pt-Rh catalyst and the characteristics of the Pt-Rh catalyst.
つぎに本発明を以下の実−例でさらに詳細に説明する。The invention will now be explained in more detail with the following examples.
実施例り
酢酸で安定化したアルミナ含有率１０ ％のアルミナ
ゾル３００ ｇ Ｋ蒸留水２５０ ｇ ｋ加え、さらに
硝酸アルミニウム４５ｇ１加え、攪拌して混合懸濁液を
得た。つぎに平均粒径１０μｍＱ）ｒ−アルミナ粉末６
００ｇを混合懸濁液に加え、スラリとし友。このスラリ
中にコージライト質モノリス担体用基材（直径９３ａｍ
長さ７５ｍｍ円筒状）Ｙｔ２分間浸漬し、引き上げてセ
ル内のスラリを空気流で吹き飛ばし一１５Ｇ で３時間
乾燥ｈ７００＠Ｇで２時間焼成して、アルミナ層を形成
した。りぎにこの担体を塩□化パラジウム塩散溶液に１
時間浸漬し、水素化ホウ素ナトリウム水浴液で５分間還
元後水洗および湯洗を行い、１５０’Ｏで３時間乾燥し
て、 ｐａ＝１含むアルミナ層を傅た。つぎ−で、塩化
ロジウムを含浸し乾燥した平均粒径１０μｍのγ−アル
ミナと、酢酸で安定化したアルミナゾル、＃留水硝酸ア
ルミニウム金剛いてｍａｔ、友スラリ中に上記担体（Ｆ
ｈｔ−含むアルミナ層が形成されている）を２分間浸漬
し、引き上げてセル内のスラＩＪ ｔ−空気流で吹き飛
ばし１５ｄ’Ｃで３時間乾燥、 ５００”Ｇで１時間
焼成して、下層Ｋ Ｐａ 、上層にＦｈ′ｆｔ含有する
触媒ａｌ得た。なおこのときのＰｄ、Ｒｈ金含有は表Ｉ
Ｋ示すようであり几。Example 300 g of alumina sol with an alumina content of 10% stabilized with acetic acid, 250 g of distilled water, and 45 g of aluminum nitrate were added and stirred to obtain a mixed suspension. Next, the average particle size is 10 μm Q) r-alumina powder 6
Add 00g to the mixed suspension and make a slurry. In this slurry, a base material for a cordierite monolith carrier (diameter 93 am) was added.
The cell was immersed in Yt for 2 minutes (75 mm in length, cylindrical), pulled out, the slurry inside the cell was blown off with an air stream, dried at 15 G for 3 hours, and fired at 700 G for 2 hours to form an alumina layer. Add this carrier to palladium salt dispersion solution for 1 hour.
The sample was immersed for an hour, reduced in a sodium borohydride aqueous solution for 5 minutes, washed with water and hot water, and dried at 150'O for 3 hours to form an alumina layer containing pa=1. Next, the above carrier (F
The alumina layer containing ht-containing alumina layer is formed) is immersed for 2 minutes, pulled up and blown away with an air stream in the cell, dried at 15d'C for 3 hours, and fired at 500''G for 1 hour to remove the lower layer K. A catalyst al containing Pa and Fh'ft in the upper layer was obtained.The Pd and Rh gold contents at this time are shown in Table I.
It seems to show K.
寮厖朔２
実ｍｎｌと同じ操作でコージライト質モノリス担体用基
材（直径９３ｍｍ ｂ長さ７６ｍｍ円筒状）にアルミナ
層を形成した。つぎにこの担体を塩化ロジウム水浴液に
１時間浸漬し、 １５０”Ｇで３時間乾燥して、亀を含
むアルミナｌ１ｌｆ を得た。つぎに塩化パラジウムを
担持した平均粒径１０μｍのｒ−アルミナと酪酸で安定
化したアルミナゾル、＃留水、硝酸アルミニウムで調製
したスラリ中に、上記担体＜ｈｔ含むアルミナ層が形成
されている）を２分間浸漬し、引き上げてセル内のスラ
リ會空気流で吹き飛ばしｈｉｓｏ”ｃで３時間乾燥、５
００°Ｃで１時間焼成して、下層に亀。An alumina layer was formed on a base material for a cordierite monolith carrier (cylindrical shape with a diameter of 93 mm and a length of 76 mm) in the same manner as in the case of the 2nd real mnl. Next, this support was immersed in a rhodium chloride water bath solution for 1 hour and dried at 150"G for 3 hours to obtain alumina l1lf containing tortoise. Next, r-alumina with an average particle size of 10 μm supporting palladium chloride and The above carrier <an alumina layer containing ht is formed) is immersed for 2 minutes in a slurry prepared with alumina sol stabilized with butyric acid, #distilled water, and aluminum nitrate, and then pulled out and blown away by the slurry air flow in the cell. Dry with hiso”c for 3 hours, 5
Bake at 00°C for 1 hour to form a turtle on the bottom layer.
上階ＫＰａを含有する触媒ｂ’ｌ得た。なお゛このとき
のＰｄ、Ｒｈ含有量は表ＩＫ示すようであった。A catalyst b'l containing KPa was obtained. Note that the Pd and Rh contents at this time were as shown in Table IK.
実施例λ
実施例１と同じ操作でコージライト質モノリス担体用基
材にアルミナ層上形成し、塩化パラジウムを担持して、
ｐａ”ｌ含むアルミナ層を得た。Example λ In the same manner as in Example 1, an alumina layer was formed on a cordierite monolith carrier base material, palladium chloride was supported,
An alumina layer containing pa"l was obtained.
つぎに、塩化ロジウムおよびジニトロジアミノ白金を担
持した平均粒径１０ｐｍのγ−アルミナと酢酸で安定化
したアルミナゾル、蒸留水、硝酸アルミニウムで！！Ｉ
ｉＩ製したスラリ中に上＆２１体（Ｐｄｌ含むアルミナ
層が形成されている）ｋ２分間浸漬し、引き上げてセル
内のスラリｉ空気流で吹き他ばし、１５０°Ｃで３時間
乾燥、 ５００＠Ｇ″″ｃ１時間焼成して、下層Ｋ
ＦＷ 、上層にＰｔ、Ｒｈ１−含有する触媒ａｆ得た。Next, use γ-alumina with an average particle size of 10 pm supporting rhodium chloride and dinitrodiaminoplatinum, alumina sol stabilized with acetic acid, distilled water, and aluminum nitrate! ! I
The upper & 21 bodies (with an alumina layer containing Pdl formed) were immersed in the prepared slurry for 2 minutes, pulled out, blown off by the slurry air stream in the cell, and dried at 150°C for 3 hours, 500＠ G″″c Baked for 1 hour, lower layer K
FW, a catalyst af containing Pt and Rh1 in the upper layer was obtained.
なお、このときｖ嵐。In addition, at this time, V Arashi.
Ｐｔ、Ｒｈの含有量は表１のようであり几。The contents of Pt and Rh are as shown in Table 1.
なお、実施例１〜３において、玉と＆あるいはｐｃ−Ｒ
ｈ１分離して担持した触媒が述べられたわけであるが、
兎と玉あるいはλ−玉を分離して担持する方法はこの例
に限らず、スラリ中ｅｃＰｔ。In addition, in Examples 1 to 3, balls and & or pc-R
h1 Separated and supported catalyst was mentioned,
The method of separating and supporting the rabbit and ball or the λ-ball is not limited to this example, and ecPt in the slurry may be used.
ｈ轡の１１！液を投入する方法でも良く、また、焼成し
てｒ−アルミナとなるよりなアルミニウム塩の水溶液Ｋ
Ｐｔ、 Ｒ１，ｈ等の塩を投入し、含浸する方法でも良
い。またこれらを組合わせても良い。11 of H! Alternatively, an aqueous solution of aluminum salt K that becomes r-alumina by firing may be used.
A method of impregnating by adding salt such as Pt, R1, h, etc. may also be used. Moreover, these may be combined.
また、上記の本発明の実施例を従来例と比較するために
、つぎに述べる比較例を用意し友。In addition, in order to compare the embodiment of the present invention described above with the conventional example, the following comparative example was prepared.
比ＩＲ例１゜
５Ｊ！Ｌ？１１１と一様の操作でモノリス担体用基材に
アルミナ層を形成した。なお、このときアルミナの付看
ｔｔ確保する友め、この操作？２回繰り返し友、つぎに
ジニトロジアミノ白金水溶液中に１時間浸漬し、１５０
°Ｇで３時間乾燥した後、塩化ロジウム水溶液に１時間
浸漬、１５０°Ｃで３時間乾燥して表ＩＫ示す触媒ｄ′
に得た。Specific IR example 1゜5J! L? An alumina layer was formed on the base material for a monolithic carrier by the same operation as in step 111. In addition, at this time, my friend who will ensure that Alumina is taken care of, will this operation be performed? Repeat twice, then immerse in dinitrodiaminoplatinum aqueous solution for 1 hour,
After drying at °G for 3 hours, immersing in rhodium chloride aqueous solution for 1 hour and drying at 150 °C for 3 hours, catalyst d' shown in Table IK was prepared.
I got it.
比較例２
比較？Ｉ１１と同じ操作でモノリス担体基材にアルミナ
層を形成した。つぎに塩化パラジウム塩酸溶液に１時間
浸漬し、水素化ホウ素ナトリウムで還元し、水洗、湯洗
後１５０＠Ｏで３時間乾燥し念、：）ぎにジニトロシア
ミノ白金水溶液および塩化ロジウム水溶液の混合液中に
上記担体ｔ１時間浸漬し、 １５Ｇ”Ｏで３時間乾燥し
て１表ＩＫ示す触媒・を得た。Comparative Example 2 Comparison? An alumina layer was formed on the monolithic carrier base material by the same operation as I11. Next, it was immersed in a palladium chloride hydrochloric acid solution for 1 hour, reduced with sodium borohydride, washed with water, washed with hot water, and dried for 3 hours at 150 @ O. :) Next, a dinitrosyaminoplatinum aqueous solution and a rhodium chloride aqueous solution were mixed. The above carrier was immersed in the solution for 1 hour and dried with 15G"O for 3 hours to obtain the catalyst shown in Table 1.
上記の実施例、比較例を表示するとりぎの辿りである・
。This is a guide to displaying the above examples and comparative examples.
.
表Ｌ 担体Ｘｔあた参の触媒含有ｔ （ｓ４−ｃｕｔ）
これらａな−し・Ｏ触媒は以下の方法で耐久試験會実總
し、浄化性Ｉ＠を評価した。耐久試験は６気筒２８００
ｃｃエンジンの排気系に触媒を設置する方法で実施しｈ
Ａ／Ｆ ％ １４．８８．Ｖ：６万ｈｒ。Table L Catalyst content of support Xt Atasugi (s4-cut)
These a-no-O catalysts were subjected to a durability test in the following manner, and their purifying properties I@ were evaluated. Durability test is 6 cylinder 2800
This is done by installing a catalyst in the exhaust system of a cc engine.
A/F% 14.88. V: 60,000 hours.
触媒床ｉｌＩ度１′１７２０°Ｃであり几。なお、この
耐久試験は被毒による劣化を促進させるため・に、エン
ジン吸気糸にエンジンオイルを１時間あたり３９ｅｃ滴
下した。また、触媒の浄化性能評ｉｉｂは。The temperature of the catalyst bed was 1'1720°C. In this durability test, engine oil was dripped onto the engine intake line at a rate of 39 ec per hour in order to accelerate deterioration due to poisoning. Also, the catalyst purification performance evaluation IIB.
ＣＯ：α８−ａ Ｎ Ｏｘ ： ２２００ Ｐ ｐ”＆
ＨＣとしてＧｓＨｓ Ｓ８４０ｐｐｍ 、（ｈ ：
αｇ＋（Ｓ： α１７５Ｇ、ＨｍＯ： 約３−１
ＧＯｓ：１Ｇ％、残りＮｓｏモデルガスを用イ、Ｓ、■
約９万ｈｒ−１の割合で触媒に通じて、Ｎ０ｘｆ還元さ
せ、ＧＯ，ＨＧｆ酸化させて、 ＣＯ，ＨＯ，ＮＯｘの
浄化率を調定した。このとき、モデルガスの温度は可変
とし、１５０°Ｃ〜４０Ｇ＠Ｇの範囲で浄化率ｔｍ定し
た。結果を第３図および第４因に示す。一般に広く使用
されてりるＰｔ−Ｒｈ系触媒＋Ｉｃ比較して、Ｐｔの一
部を毘に置きかえ低コスト化を計ったＰｔ −Ｐａ−＆
系触媒ｅは、低温での浄化性能は若干良いが、高温での
性能は著しく悪化していることがわかる。これに対しｈ
抛とｈ−λあるいはＲｈ１ｉ別々の層に担持した触媒ａ
、ｂ、ｃは低温で従来０Ｐｔ−Ｒｈ系触媒より著しく高
活性を示し、高温側でも同等以上の性能が得られ、ｐｔ
−＆−Ｒｈ系触媒が改曳されていることがわかる。CO: α8-a N Ox: 2200 P p”&
GsHs S840ppm as HC, (h:
αg+(S: α175G, HmO: Approx. 3-1
GOs: 1G%, using the remaining Nso model gas A, S, ■
The catalyst was passed through the catalyst at a rate of approximately 90,000 hr-1 to reduce NOxf and oxidize GO and HGf, thereby adjusting the purification rates of CO, HO, and NOx. At this time, the temperature of the model gas was made variable, and the purification rate tm was determined in the range of 150°C to 40G@G. The results are shown in Figure 3 and Factor 4. Compared to the generally widely used Pt-Rh catalyst +Ic, Pt-Pa- &
It can be seen that system catalyst e has slightly better purification performance at low temperatures, but its performance at high temperatures is significantly worse. On the other hand, h
Catalyst a supported on separate layers of 抛 and h-λ or Rh1i
, b, and c show significantly higher activity than conventional 0Pt-Rh catalysts at low temperatures, and the same or higher performance can be obtained even at high temperatures.
It can be seen that the -&-Rh-based catalyst has been modified.
まもｈの全部ｔｈＫ置きかえたＦＷ−’＆系触媒ａｍ’
ｂｔ−比較すると＆ＰｔＬ管含有するアルミナ層管下層
とし、上層にλを含有するアルミナＮｌｌを形成した触
媒ａが、逆の場合の触媒すより高活性であることがわか
る。しかし、活性の低−触媒すでも従来の方法で調製し
たＰｔ −Ｐａ −Ｆｋ系触媒ｅより著しく高活性であ
る。FW-'& system catalyst am' in which all thK of Mamoh was replaced
bt-comparison, it can be seen that catalyst a, which has an alumina layer containing &PtL tubes in the lower layer and alumina Nll containing λ in the upper layer, has higher activity than the catalyst in the opposite case. However, even the low-activity catalyst is significantly more active than the Pt-Pa-Fk-based catalyst e prepared by the conventional method.
以上の通９であるから１本発明の排気ガス浄化用触媒に
よるときＦｉｋｐｔ−ｈ触媒のｈをＰａｗ置きかえて低
コスト化を計るうえで問題となり９．′
ていた浄化性能の悪化を本発ｑｉ４によって触媒管調製
することにより、解決することができるという効果が得
られる。9. As stated above, when using the exhaust gas purifying catalyst of the present invention, there is a problem in replacing h of the Fikpt-h catalyst with Paw to reduce costs.9. By preparing the catalyst tube using the present Qi4, it is possible to solve the problem of deterioration in purification performance.
第１図は本発明の排気ガス浄化用触媒の一例に係る断Ｗ
ｊＪ図。
第２図社本発明の排気ガス浄化用触媒の別のｆＩＩＫ係
る断面図。
第３図は実ｍ例１〜３（Ｑ触媒ａ、ｂ、ｃおよび比較？
１１，２の触媒ｄ、・のＣＯ活性を示す特性図。
＄＋４図は実＃１ＩｉＰ１１〜３の触媒ａ、ｂ、ｃｊＰ
ｊび比較例１．２の触媒ｄ−・のＮＯｘ活性會示上鍔性
図。
である。
ｌ・・・・ハニカム形状の触媒担体。
２・番・・Ｆｉｌ含有するアルミナＨＩｉ。
３・・・・汽−九あるいｒｊｉ（ｈを含有するアルミナ
層。
第１図
１！３図FIG. 1 shows a cross section W of an example of the exhaust gas purifying catalyst of the present invention.
jJ diagram. FIG. 2 is a sectional view according to another fIIK of the exhaust gas purifying catalyst of the present invention. Figure 3 shows actual examples 1 to 3 (Q catalysts a, b, c and comparison?
11,2 is a characteristic diagram showing the CO activity of catalyst d,. $+4 Figure shows real #1IiP11-3 catalysts a, b, cjP
FIG. 3 is a diagram showing the NOx activity of catalyst d-. of Comparative Example 1.2 and Comparative Example 1.2. It is. l...Honeycomb-shaped catalyst carrier. No. 2: Alumina HIi containing Fil. 3... Alumina layer containing steam-9 or rji (h).
Claims (1)
るアルミナ層とＰｔ−ｆ（ｈあるいはｈを含有するアル
ミナ層とｔ別の層に分離して担持し几ことｔ−％鑓とす
る排気ガス浄化用触媒。 （２、特許請求の範囲第１項に記載の排気ガス浄化用触
媒に＆いて、下層［Ｆｈ 全含有するアルミナ層が形成
され、その層上ｒｃＰｔ −ＥｈあるいＦｉｆｋを含む
アルミナ層が形成されているもの。＝（３） 特許請
求の範Ｈ軍１項に記載の排気ガス浄化用触媒において、
下層ＫＰｔ−Ｆｌｈあるいｆｌ’Ｂｂｔ含有するアルミ
ナ層が形成され、その層上Ｋ Ｐａ ｋ含有するアルミ
ナ層が形成されているもの。(1) Exhaust gas is separated and supported on a honeycomb-shaped catalyst carrier into an alumina layer containing FW'Q, an alumina layer containing Pt-f (h, or an alumina layer containing h, and another layer of t). Catalyst for gas purification. (2. In the catalyst for exhaust gas purification according to claim 1, an alumina layer containing all [Fh] is formed in the lower layer, and the upper layer contains rcPt -Eh or Fifk. An alumina layer is formed.=(3) In the exhaust gas purifying catalyst according to claim H, item 1,
An alumina layer containing KPt-Flh or fl'Bbt is formed as a lower layer, and an alumina layer containing KPak is formed above that layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57027455A JPS58146441A (en) | 1982-02-24 | 1982-02-24 | Catalyst for purification of exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57027455A JPS58146441A (en) | 1982-02-24 | 1982-02-24 | Catalyst for purification of exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58146441A true JPS58146441A (en) | 1983-09-01 |
Family
ID=12221589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57027455A Pending JPS58146441A (en) | 1982-02-24 | 1982-02-24 | Catalyst for purification of exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58146441A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61234932A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234931A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234936A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234937A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPH01143641A (en) * | 1987-10-30 | 1989-06-06 | Degussa Ag | Catalyst and method for simultaneously converting carbon monoxide, hydrocarbon and nitrogen oxide from exhaust gas from internal combustion engine |
| WO2002002916A1 (en) * | 2000-06-30 | 2002-01-10 | Ict Co., Ltd. | Catalyst device for clarification of exhaust gas |
| JP2013166097A (en) * | 2012-02-14 | 2013-08-29 | Toyota Motor Corp | Exhaust gas-purifying catalyst |
-
1982
- 1982-02-24 JP JP57027455A patent/JPS58146441A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61234932A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234931A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234936A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPS61234937A (en) * | 1985-04-09 | 1986-10-20 | Mazda Motor Corp | Catalyst for purifying exhaust gas of engine |
| JPH0547262B2 (en) * | 1985-04-09 | 1993-07-16 | Mazda Motor | |
| JPH0554380B2 (en) * | 1985-04-09 | 1993-08-12 | Mazda Motor | |
| JPH0554382B2 (en) * | 1985-04-09 | 1993-08-12 | Mazda Motor | |
| JPH0554384B2 (en) * | 1985-04-09 | 1993-08-12 | Mazda Motor | |
| JPH01143641A (en) * | 1987-10-30 | 1989-06-06 | Degussa Ag | Catalyst and method for simultaneously converting carbon monoxide, hydrocarbon and nitrogen oxide from exhaust gas from internal combustion engine |
| WO2002002916A1 (en) * | 2000-06-30 | 2002-01-10 | Ict Co., Ltd. | Catalyst device for clarification of exhaust gas |
| JP2013166097A (en) * | 2012-02-14 | 2013-08-29 | Toyota Motor Corp | Exhaust gas-purifying catalyst |
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