JPS61164645A - Preparation of catalyst for purifying exhaust gas - Google Patents
Preparation of catalyst for purifying exhaust gasInfo
- Publication number
- JPS61164645A JPS61164645A JP60005569A JP556985A JPS61164645A JP S61164645 A JPS61164645 A JP S61164645A JP 60005569 A JP60005569 A JP 60005569A JP 556985 A JP556985 A JP 556985A JP S61164645 A JPS61164645 A JP S61164645A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- activated alumina
- alumina particles
- supported
- 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 86
- 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 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 239000002184 metal Substances 0.000 claims abstract description 37
- 239000010948 rhodium Substances 0.000 claims abstract description 35
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 32
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 26
- 238000000746 purification Methods 0.000 claims abstract description 22
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 21
- 230000003197 catalytic effect Effects 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 20
- 150000002739 metals Chemical class 0.000 claims abstract description 16
- 239000010419 fine particle Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 150000003058 platinum compounds Chemical class 0.000 claims abstract description 3
- 150000003284 rhodium compounds Chemical class 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims description 10
- -1 comprising: Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 11
- 229910052763 palladium Inorganic materials 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910018967 Pt—Rh Inorganic materials 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 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 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- SONJTKJMTWTJCT-UHFFFAOYSA-K rhodium(iii) chloride Chemical compound [Cl-].[Cl-].[Cl-].[Rh+3] SONJTKJMTWTJCT-UHFFFAOYSA-K 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 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製造方法に関し、詳し
くは、内燃機関用の排気ガス浄化用触媒の製造において
、触媒金属であるＰｄに加えて、ＰｔとＲｈのいずれか
もしくは両方の触媒金属を分離させた状態となして担持
させることによって、触媒としての活性を向上させるこ
とのできる排気ガス浄化用触媒の製造方法にかかる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing an exhaust gas purifying catalyst, and more specifically, in producing an exhaust gas purifying catalyst for an internal combustion engine, Pd, which is a catalyst metal, is used. In addition, the present invention relates to a method for producing an exhaust gas purifying catalyst whose activity as a catalyst can be improved by supporting catalyst metals such as Pt and Rh or both in a separated state.
自動車用内燃機関等に用いる排気ガス浄化用触媒として
は、触媒金属の微細粒子を保持するとともに触媒活性を
向上させる作用を有する担体として活性アルミナ粒子を
用いて、その粒子表面にＣｕ、Ｎｉ、Ｆｅ、Ｍｎ、Ｃｏ
、Ｐｄ、Ｐｔ、Ｒｈ等の触媒金属を担持させた触媒が採
用されるのが通常である。Exhaust gas purification catalysts used in internal combustion engines for automobiles use activated alumina particles as a carrier that holds fine particles of catalytic metal and improves catalytic activity.Cu, Ni, and Fe are added to the particle surface. , Mn, Co
, Pd, Pt, Rh, or other catalytic metals are usually used.
そして、自動車用の排気ガス浄化用触媒においては、耐
久性、浄化性能等といった極めて高度な触媒性能が要求
されている。Exhaust gas purifying catalysts for automobiles are required to have extremely high catalyst performance such as durability and purification performance.
そのため、従来における自動車の排気ガス中に含有され
ているＣｏ、ＨＣ，ＮＯｘ等の有害成分を同時に除去す
るために有効な触媒金属としては、白金（Ｐｔ）、パラ
ジウム（Ｐｄ）、 ロジウム（Ｒｈ）等の白金族金属
を単独もしくは組合せて担持させた触媒が比較的価れた
浄化性能を有するものとされ、なかでも、総合性能の優
れたＰｔ−Ｒｈ系触媒が広く採用されている。Therefore, platinum (Pt), palladium (Pd), and rhodium (Rh) are effective catalyst metals for simultaneously removing harmful components such as Co, HC, and NOx contained in conventional automobile exhaust gas. Catalysts supporting platinum group metals such as Pt-Rh, singly or in combination, are said to have relatively good purification performance, and among them, Pt-Rh catalysts, which have excellent overall performance, are widely used.
しかし、これらＰｔ−Ｒｈ系触媒は高価であることから
、価格的に１／２〜１／３と安価なＰｄをＰｔの代わり
に用いた、Ｐｔ−Ｐｄ−Ｒｈ系触媒もしくはＰｄ−Ｒｈ
系触媒の開発検討が近年積極的に進められている。However, these Pt-Rh based catalysts are expensive, so Pt-Pd-Rh based catalysts using Pd, which is 1/2 to 1/3 cheaper in place of Pt, or Pd-Rh based catalysts are used instead of Pt.
The development of catalysts has been actively investigated in recent years.
ところで、Ｐｔ−Ｐｄ−Ｒｈ系触媒もしくはＰｄ−Ｒｈ
系触媒は、Ｐｔ−Ｒｈ系触媒に比較して酸化性雰囲気に
おける劣化が少ない、浄化開始温度が低い等といった長
所を有する反面、還元雰囲気における劣化が著しい、ｐ
、ｐｂ等による被毒作用に弱い、ＰｄはＰｔやＲｈに対
して相互作用があることからＰｔ及びＲｈの浄化性能を
阻害するような挙動を示すことがある等の欠点があり、
これらの欠点を改善した触媒の開発が強く望まれていた
。By the way, Pt-Pd-Rh based catalyst or Pd-Rh
Compared to Pt-Rh based catalysts, Pt-Rh based catalysts have advantages such as less deterioration in an oxidizing atmosphere and a lower purification start temperature, but on the other hand, they deteriorate significantly in a reducing atmosphere.
Pd has disadvantages such as being susceptible to poisoning effects by PB, etc., and since Pd interacts with Pt and Rh, it may exhibit behavior that inhibits the purification performance of Pt and Rh.
There has been a strong desire to develop a catalyst that improves these drawbacks.
そこで、触媒の表層部をＰｄにより担持させた活性アル
ミナ層と、ＰｔもしくはＲｈのいずれかもしくは両方の
触媒金属を担持させた活性アルミナ層とを各々別の層と
して分離させた状態に担持させて、ＰｄとＰｔもしくは
Ｒｈとの共存することによる相互作用を防止し、Ｐｔ−
Ｐｄ−Ｒｈ系触媒もしくはＰｄ−Ｒｈ系触媒の浄化性能
を向上させた排気ガス浄化用触媒が提案されている（特
開昭５８−１４６４４１号等）。Therefore, an activated alumina layer in which the surface layer of the catalyst is supported by Pd and an activated alumina layer in which catalyst metals such as Pt and/or Rh are supported are separated into separate layers. , prevent interaction between Pd and Pt or Rh due to their coexistence, and prevent Pt-
A Pd-Rh-based catalyst or an exhaust gas purifying catalyst with improved purification performance of a Pd-Rh-based catalyst has been proposed (Japanese Patent Application Laid-Open No. 146441/1989, etc.).
上述のような従来の技術の現状に１み、本発明が解決し
ようとする問題点は、上述のような従来の排気ガス浄化
用触媒の製造方法においては、触媒の表層部をＰｄによ
り担持させた活性アルミナ層と、ＰｔもしくはＲｈのい
ずれかもしくは両方の触媒金属を担持させた活性アルミ
ナ層とを各々別の層として分離させた状態に担持させる
こととしていることから、触媒の浄化性能を向上させる
ことができるものの、排気ガス浄化用触媒の製造工程が
複雑となり、従って、製造された排気ガス浄化用触媒も
高価なものとなっていたということである。In view of the current state of the conventional technology as described above, the problem that the present invention seeks to solve is that in the conventional method for manufacturing an exhaust gas purifying catalyst as described above, the surface layer of the catalyst is supported by Pd. The activated alumina layer supporting catalyst metals such as Pt and/or Rh and the active alumina layer supporting catalyst metals such as Pt and/or Rh are separated and supported as separate layers, improving the purification performance of the catalyst. However, the manufacturing process for the exhaust gas purifying catalyst is complicated, and the manufactured exhaust gas purifying catalyst is therefore expensive.
従って、本発明の技術的課題とするところは、内燃機関
用の排気ガス浄化用触媒の製造において、活性アルミナ
の粒子を懸濁させたスラリー中に、触媒金属であるＰｄ
の微細粒子を混合させ、活性アルミナの粒子表面にＰｄ
の微細粒子を被覆して担持させた後、ＰｔとＲｈのいず
れかもしくは両方の触媒金属を浸漬法により担持させる
ことによって、触媒金属であるＰｄに加えて、ＰｔとＲ
ｈのいずれかもしくは両方の触媒金属とを分離させた状
態となして担持させることによって、触媒としての活性
を向上させるとともに、低価格な排気ガス浄化用触媒の
製造を可能とすることにある。Therefore, the technical problem of the present invention is that in the production of an exhaust gas purifying catalyst for internal combustion engines, Pd, which is a catalyst metal, is added to a slurry in which activated alumina particles are suspended.
Pd is mixed on the surface of activated alumina particles.
After coating and supporting fine particles, one or both of Pt and Rh catalyst metals are supported by a dipping method.
By supporting one or both of the catalytic metals in a separated state, the activity as a catalyst can be improved, and an exhaust gas purifying catalyst can be produced at a low cost.
このような従来の技術における問題点に鑑み、本発明に
おける従来の技術の問題点を解決するための手段は、活
性アルミナの粒子表面に触媒金属であるＰｄに加えて、
ＰｔとＲｈのいずれかもしくは両方の触媒金属を担持さ
せる排気ガス浄化用触媒の製造方法であって、
まず、活性アルミナの粒子を懸濁させたスラリー中に触
媒金属であるＰｄの微細粒子を混合させて、活性アルミ
ナの粒子表面にＰｄの微細粒子を被覆して担持し、
その後、ＰｔとＲｈのいずれがもしくは両方の触媒金属
を、白金化合物の水溶液とロジウム化合物の水溶液のい
ずれかもしくは両方に浸漬して、ＰｔとＲｈのいずれか
もしくは両方の触媒金属を担持させることによって、Ｐ
ｄとＰｔもしくはＲｈとを分離させた状態となして活性
アルミナの粒子表面に担持させることを特徴とする排気
ガス浄化用触媒の製造方法からなっている。In view of these problems in the conventional technology, the present invention provides means for solving the problems in the conventional technology by adding Pd, which is a catalytic metal, to the surface of activated alumina particles.
A method for manufacturing an exhaust gas purification catalyst that supports either or both of Pt and Rh as a catalytic metal. First, fine particles of Pd, which is a catalytic metal, are mixed into a slurry in which activated alumina particles are suspended. Then, Pd fine particles are coated and supported on the surface of activated alumina particles, and then Pt and/or Rh catalyst metals are added to an aqueous solution of a platinum compound, an aqueous solution of a rhodium compound, or both. By immersing Pt and/or Rh to support catalyst metals, P
The present invention is comprised of a method for producing an exhaust gas purifying catalyst characterized in that d and Pt or Rh are separated and supported on the surface of activated alumina particles.
以下、本発明の作用について説明する。 Hereinafter, the effects of the present invention will be explained.
本発明の排気ガス浄化用触媒の製造方法を上述のような
構成としているのは、触媒金属であるＰｄの微細粒子を
混合法により活性アルミナの粒子表面に担持させた後、
ＰｔとＲｈのいずれかもしくは両方の触媒金属を浸漬法
により活性アルミナの粒子表面に担持させることによっ
て、触媒金属であるＰｄに加えて、ＰｔとＲｈのいずれ
かもしくは両方の触媒金属を分離させた状態となして担
持させることによって、触媒としての活性を向上させる
とともに、低価格な排気ガス浄化用触媒の製造を可能と
するためである。The method for producing an exhaust gas purifying catalyst of the present invention has the above-described structure because fine particles of Pd, which is a catalyst metal, are supported on the surface of activated alumina particles by a mixing method, and then
By supporting one or both of Pt and Rh on the surface of activated alumina particles by a dipping method, in addition to the catalyst metal Pd, one or both of Pt and Rh was separated. This is because by supporting the catalyst in the form of a catalyst, the activity as a catalyst can be improved, and an exhaust gas purifying catalyst can be produced at a low cost.
以下、添付図面に基づいて、本発明の排気ガス浄化用触
媒の製造方法の１実施例を説明する。EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the method for manufacturing an exhaust gas purifying catalyst of the present invention will be described based on the accompanying drawings.
なお、この実施例における触媒担体としては活性アルミ
ナ粒子を用い、触媒金属としてはＰｄに加えて、Ｐｔ及
びＲｈを共に担持させた排気ガス浄化用触媒の製造方法
の例について説明する。In this example, an example of a method for manufacturing an exhaust gas purifying catalyst using activated alumina particles as a catalyst carrier and carrying Pt and Rh in addition to Pd as catalyst metals will be described.
本発明法による排気ガス浄化用触媒の製造方法において
、まず、アルミナ含有量が１０重量％のアルミナシルア
００ｇ、４０重量％の硝酸アルミニウム水溶液１５０ｇ
を添加し、さらに、蒸留水４５０ ｍｌを加えて攪拌し
て混合懸濁液を調製した。In the method for producing an exhaust gas purification catalyst according to the method of the present invention, first, 00 g of alumina silua with an alumina content of 10% by weight, and 150 g of an aqueous aluminum nitrate solution with an alumina content of 10% by weight.
was added, and further 450 ml of distilled water was added and stirred to prepare a mixed suspension.
その後、上述の混合懸濁液の中にアルミナ粒子を９００
ｇと、触媒金属であるＰｄの微細粒子（粒径；約３０μ
）１００ｇを加えて攪拌し、活性アルミナ粒子と触媒金
属であるＰｄの微細粒子とを懸濁させたスラリーを調製
した。Then, 900% of alumina particles were added to the above mixed suspension.
g and fine particles of Pd, which is a catalyst metal (particle size: approximately 30μ
) was added and stirred to prepare a slurry in which activated alumina particles and fine particles of Pd, which is a catalyst metal, were suspended.
この活性アルミナと触媒金属としてのＰｄの微細粒子を
懸濁させたスラリー中に、直径１０ｃｗ＋。A diameter of 10 cw+ was placed in a slurry in which fine particles of activated alumina and Pd as a catalyst metal were suspended.
長さ１５ｃｍの円筒状モノリス担体用基材を１分間浸漬
し、空気の吹き付けにより円筒状モノリス担体用基材の
セル内のスラリーを吹き飛ばした後、２００℃×１時間
の乾燥処理を行ない、ついで、７００℃×２時間の焼成
処理を行った。A cylindrical monolith carrier base material with a length of 15 cm was immersed for 1 minute, and after blowing off the slurry in the cells of the cylindrical monolith carrier base material by blowing air, a drying process was performed at 200°C for 1 hour, and then A firing treatment was performed at 700° C. for 2 hours.
このようにして触媒金属を担持させた円筒状モノリス担
体用基材を、再び、上述の活性アルミナと触媒金属の微
細粒子を懸濁させたスラリー中に１５１潰して、同様の
操作を縛り返した。The cylindrical monolith carrier base material on which the catalytic metal was supported in this way was crushed again into the slurry in which the above-mentioned activated alumina and fine particles of the catalytic metal were suspended, and the same operation was repeated. .
その後、この活性アルミナ層を形成させた円筒状モノリ
ス担体用基材を蒸留水に浸漬して充分に吸水させた後、
引き上げて余剰の水分を空気により吹き飛ばし、ついで
、ジニトロジアンミン白金水溶液［Ｐｔ （ＮＨ，）２
（Ｎｏ、）２）ｉｏ、５ｇ１ｌ中に１時間浸漬した
後、引き上げて余剰の水分を空気により吹き飛ばし、さ
らに、２００℃×１時間の乾燥処理を行い、同様にして
塩化ロジウム水溶液（ＲｈＣＩ 、）；０．１ｇ／ｌ中
にてＲｈを担持させて触媒ａを製造した。After that, the cylindrical monolith carrier base material on which this activated alumina layer was formed was immersed in distilled water to absorb sufficient water, and then
The excess moisture was blown off with air, and then dinitrodiammine platinum aqueous solution [Pt (NH,)2
(No,) 2) After immersing in 5 g 1 liter of io for 1 hour, pull it out and blow off the excess water with air, and then dry it at 200°C for 1 hour, and do the same in the same way as rhodium chloride aqueous solution (RhCI). ;Catalyst a was produced by supporting Rh in 0.1 g/l.
次に、比較としての従来法による排気ガス浄化用触媒の
製造方法により製造した触媒においては、まず、アルミ
ナ含有量１０重量％のアルミナシルア００ｇ、４０重量
％の硝酸アルミニウム水溶液１５０ｇを加え、さらに、
蒸留水４５０ｍ１を加えて攪拌して混合懸濁液を調製し
た。Next, for a catalyst manufactured by a conventional method for manufacturing an exhaust gas purifying catalyst as a comparison, 00 g of alumina silica with an alumina content of 10% by weight and 150 g of an aluminum nitrate aqueous solution with a 40% by weight alumina content were added, and further,
450 ml of distilled water was added and stirred to prepare a mixed suspension.
その混合懸濁液中に、活性アルミナ粒子１０００ｇを添
加して攪拌してスラリーを調製した。1000 g of activated alumina particles were added to the mixed suspension and stirred to prepare a slurry.
この活性アルミナ粒子を懸濁させたスラリー中に、直径
１０ｃｍ、長さ１５ｃｍの円筒状モノリス担体用基材を
１分間浸漬して、空気の吹き付けにより円筒状モノリス
担体用基材のセル内のスラリーを吹き飛ばした後、２０
０℃×１時間の乾燥処理を行ない、ついで、７００℃×
２時間の焼成処理を行った。A cylindrical monolith carrier base material with a diameter of 10 cm and a length of 15 cm was immersed in the slurry in which activated alumina particles were suspended for 1 minute, and air was blown to remove the slurry in the cells of the cylindrical monolith carrier base material. After blowing away, 20
Dry at 0°C for 1 hour, then dry at 700°C.
A firing process was performed for 2 hours.
このようにして活性アルミナ層を形成させた円筒状モノ
リス担体用基材を、再び、上述の活性アルミナを懸濁さ
せたスラリー中に浸漬して、同様の操作を繰り返した。The cylindrical monolithic carrier base material on which the activated alumina layer had been formed in this way was again immersed in the slurry in which activated alumina was suspended, and the same operation was repeated.
その後、この活性アルミナ層を形成させた円筒状モノリ
ス担体用基材を蒸留水に浸漬して充分に吸水させた後、
引き上げて余剰の水分を空気により吹き飛ばし、ついで
、ジニトロジアンミン白金水溶液（Ｐｔ （ＮＨ，）
２ （Ｎｏ２） ２）；０．５ｇ１ｌ中に１時間浸
漬した後、引き上げて余剰の水分を空気により吹き飛ば
し、さらに、２００℃×１時間の乾燥処理を行い同様に
して塩化ロジウム水溶液（Ｒｈ ＣＩ ｒ ） ；
０．１ ｇ ／ １と塩化パラジウム水溶液（Ｐｄｅ
ｌ ２） ｉ ０．５ ｇ／ｌを担持させて触媒すを
製造した。After that, the cylindrical monolith carrier base material on which this activated alumina layer was formed was immersed in distilled water to absorb sufficient water, and then
The excess moisture was blown off with air, and then dinitrodiammine platinum aqueous solution (Pt (NH,)
2 (No. 2) 2); After immersing in 0.5 g 1 liter for 1 hour, it was pulled out and the excess moisture was blown off with air. Further, it was dried at 200° C. for 1 hour, and in the same manner, rhodium chloride aqueous solution (Rh CI r ) ;
0.1 g/1 and palladium chloride aqueous solution (Pde
12) A catalyst was prepared by supporting 0.5 g/l of i.
その後、ａ、ｂの２種類の触媒を、以下の方法により耐
久試験を実施した後における浄化性能を評価した。Thereafter, the two types of catalysts a and b were subjected to a durability test using the following method, and their purification performance was then evaluated.
耐久試験条件は、エンジンを空燃比（Ａ／Ｆ）；１４．
６．空間速度（ＳＶ）：６００００ｈ、触媒床温度；７
２０℃として運転し、３００時間運転した後各触媒を使
用して触媒床への大ガス温度を変化させて浄化率を測定
した。The durability test conditions were: engine air fuel ratio (A/F); 14.
6. Space velocity (SV): 60000h, catalyst bed temperature: 7
After operating at 20°C for 300 hours, the purification rate was measured using each catalyst and varying the temperature of the large gas to the catalyst bed.
この浄化率の測定は、空燃比（Ａ／Ｆ）； １４゜６と
して触媒の浄化率の温度特性を評価する方法により実施
した。The purification rate was measured using a method of evaluating the temperature characteristics of the catalyst purification rate at an air-fuel ratio (A/F) of 14°6.
その測定結果を第１図に示す。The measurement results are shown in FIG.
なお、この図における浄化率としては、浄化対象をＣｏ
、ＨＣ，ＮＯｘのいずれとしても同様の傾向を示した。Note that the purification rate in this figure is based on Co
, HC, and NOx showed similar trends.
第１図から明らかなように、本発明の排気ガス浄化用触
媒の製造方法により製造した触媒ａは、従来の排気ガス
浄化用触媒の製造方法により製造した触媒すと比較して
、３００時間の長時間耐久試験後においても低温浄化性
能に優れており、本発明の排気ガス浄化用触媒の製造方
法により製造した触媒の浄化性能における優れた耐久性
を示していることがわかる。As is clear from FIG. 1, the catalyst a produced by the method for producing an exhaust gas purifying catalyst of the present invention has a longer lifespan of 300 hours than the catalyst A produced by the conventional method for producing an exhaust gas purifying catalyst. It can be seen that the catalyst has excellent low-temperature purification performance even after a long-term durability test, and shows excellent durability in purification performance of the catalyst manufactured by the method for manufacturing an exhaust gas purification catalyst of the present invention.
以上により明らかなように、本発明にかかる排気ガス浄
化用触媒の製造方法によれば、内燃機関用の排気ガス浄
化用触媒の製造において、活性アルミナの粒子を懸濁さ
せたスラリー中に、触媒金属であるＰｄの微細粒子を混
合させ、活性アルミナの粒子表面にＰｄの微細粒子を被
覆して担持させた後、ＰｔとＲｈのいずれかもしくは両
方の触媒金属を浸漬法により担持させることによって、
触媒金属であるＰｄに加えて、ＰｔとＲｈのいずれかも
しくは両方の触媒金属を分離させた状態となして担持さ
せることによって、触媒としての活性を向上させるとと
もに、低価格な排気ガス浄化用触媒の製造を可能とする
ことができる利点がある。As is clear from the above, according to the method for producing an exhaust gas purification catalyst according to the present invention, in the production of an exhaust gas purification catalyst for an internal combustion engine, a catalyst is added to a slurry in which activated alumina particles are suspended. By mixing fine particles of the metal Pd, coating and supporting the surface of activated alumina particles with the fine particles of Pd, and then supporting either or both of Pt and Rh as a catalytic metal by a dipping method.
In addition to the catalytic metal Pd, the catalytic metals Pt and/or Rh are supported in a separated state, thereby improving the activity of the catalyst and creating a low-cost exhaust gas purification catalyst. It has the advantage of being able to manufacture
第１図は触媒活性の評価結果を示す図である。 ａ−−−−−一本発明法により製造した触媒。 ｂ−−一−・−従来法により製造した触媒。 FIG. 1 is a diagram showing the evaluation results of catalytic activity. a-----1 Catalyst produced by the method of the present invention. b--1-.-Catalyst produced by conventional method.
Claims (1)
えて、ＰｔとＲｈのいずれかもしくは両方の触媒金属を
担持させる排気ガス浄化用触媒の製造方法であって、 まず、活性アルミナの粒子を懸濁させたスラリー中に触
媒金属であるＰｄの微細粒子を混合させて、活性アルミ
ナの粒子表面にＰｄの微細粒子を被覆して担持し、 その後、ＰｔとＲｈのいずれかもしくは両方の触媒金属
を、白金化合物の水溶液とロジウム化合物の水溶液のい
ずれかもしくは両方に浸漬して、ＰｔとＲｈのいずれか
もしくは両方の触媒金属を担持させることによって、Ｐ
ｄとＰｔもしくはＲｈとを分離させた状態となして活性
アルミナの粒子表面に担持させることを特徴とする排気
ガス浄化用触媒の製造方法。[Scope of Claims] 1. A method for producing an exhaust gas purification catalyst in which, in addition to Pd as a catalyst metal, one or both of Pt and Rh is supported on the surface of activated alumina particles, comprising: , fine particles of Pd, which is a catalyst metal, are mixed in a slurry in which activated alumina particles are suspended, and the fine particles of Pd are coated and supported on the surface of the activated alumina particles. By immersing either or both of the catalytic metals in an aqueous solution of a platinum compound and/or an aqueous solution of a rhodium compound to support either or both of the catalytic metals of Pt and Rh, P
A method for producing an exhaust gas purifying catalyst, characterized in that d and Pt or Rh are separated and supported on the surface of activated alumina particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60005569A JPS61164645A (en) | 1985-01-15 | 1985-01-15 | Preparation of catalyst for purifying exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60005569A JPS61164645A (en) | 1985-01-15 | 1985-01-15 | Preparation of catalyst for purifying exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61164645A true JPS61164645A (en) | 1986-07-25 |
Family
ID=11614842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60005569A Pending JPS61164645A (en) | 1985-01-15 | 1985-01-15 | Preparation of catalyst for purifying exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61164645A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012120949A (en) * | 2010-12-06 | 2012-06-28 | Toyota Motor Corp | Method for producing platinum/palladium core-shell catalyst |
-
1985
- 1985-01-15 JP JP60005569A patent/JPS61164645A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012120949A (en) * | 2010-12-06 | 2012-06-28 | Toyota Motor Corp | Method for producing platinum/palladium core-shell catalyst |
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