JPH07256113A - Catalyst for purification of exhaust gas - Google Patents
Catalyst for purification of exhaust gasInfo
- Publication number
- JPH07256113A JPH07256113A JP6047069A JP4706994A JPH07256113A JP H07256113 A JPH07256113 A JP H07256113A JP 6047069 A JP6047069 A JP 6047069A JP 4706994 A JP4706994 A JP 4706994A JP H07256113 A JPH07256113 A JP H07256113A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- main component
- hours
- alumina
- activated 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.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 166
- 238000000746 purification Methods 0.000 title description 6
- 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 113
- 239000000843 powder Substances 0.000 claims abstract description 54
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000010457 zeolite Substances 0.000 claims abstract description 31
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 30
- 230000003197 catalytic effect Effects 0.000 claims abstract description 27
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 23
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 16
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 14
- 239000011247 coating layer Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 10
- 238000005342 ion exchange Methods 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 51
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 44
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 26
- 239000010949 copper Substances 0.000 claims description 13
- 239000010948 rhodium Substances 0.000 claims description 9
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 9
- 229910010272 inorganic material Inorganic materials 0.000 claims description 6
- 239000011147 inorganic material Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 abstract description 9
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 description 36
- 239000011248 coating agent Substances 0.000 description 34
- 238000000576 coating method Methods 0.000 description 34
- 238000010304 firing Methods 0.000 description 24
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 23
- 229910017604 nitric acid Inorganic materials 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 238000001035 drying Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 14
- 239000000203 mixture Substances 0.000 description 11
- 239000000758 substrate Substances 0.000 description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 229910001593 boehmite Inorganic materials 0.000 description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 description 9
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 9
- 238000010298 pulverizing process Methods 0.000 description 9
- 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 8
- 230000000052 comparative effect Effects 0.000 description 7
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 description 6
- 229910000420 cerium oxide Inorganic materials 0.000 description 6
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- 229910052684 Cerium Inorganic materials 0.000 description 5
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 4
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 4
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 4
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000001301 oxygen Substances 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
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229940011182 cobalt acetate Drugs 0.000 description 1
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 description 1
- 229910001981 cobalt nitrate Inorganic materials 0.000 description 1
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 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 1
- 229910001657 ferrierite group Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排ガス浄化用触媒に関
し、特に、自動車などの内燃機関から排出される排気ガ
ス中の炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び窒素
酸化物（ＮＯ X ）を効率良く浄化することのできる排ガ
ス浄化用触媒に関する。The present invention relates to an exhaust gas purifying catalyst.
In particular, exhaust gas emitted from internal combustion engines such as automobiles
Hydrocarbons (HC), carbon monoxide (CO) and nitrogen in gases
Oxide (NO X) Can be purified efficiently
The present invention relates to a purification catalyst.
【０００２】[0002]
【従来技術】従来、ゼオライトを用いる排ガス浄化用触
媒としては、内層に酸化反応を生じさせる貴金属成分を
含む触媒層をコーティングした後、その触媒層上にゼオ
ライトをコーティングし、更にＣｕをイオン交換して調
製された触媒が提案されている（特開平１−１２７０４
４号公報）。この触媒は、排気中の酸素濃度が理論値よ
り大きくなった状態（リーン．バーン雰囲気）であって
も、効率良くＨＣ、ＣＯ及びＮＯX を浄化することが知
られている。2. Description of the Related Art Conventionally, as an exhaust gas purifying catalyst using zeolite, an inner layer is coated with a catalyst layer containing a noble metal component that causes an oxidation reaction, then the catalyst layer is coated with zeolite, and Cu is ion-exchanged. A catalyst prepared by the above method has been proposed (Japanese Patent Laid-Open No. 12704/1989).
4 publication). It is known that this catalyst efficiently purifies HC, CO, and NO X even when the oxygen concentration in the exhaust gas is higher than the theoretical value (lean burn atmosphere).
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記し
たような触媒層構造を有する触媒は、耐久後の性能が内
層に酸化触媒層を持たない触媒よりも劣化し、充分な浄
化活性が得られないという欠点があった。また、この触
媒は、貴金属成分を含む触媒層を有するので、理論空燃
比近傍での三元性能も有するが、コーティング層の厚さ
や貴金属成分の担持量等の関係により、充分な三元性能
が得られないという欠点があった。However, the catalyst having the above-mentioned catalyst layer structure is deteriorated in performance after endurance as compared with the catalyst having no oxidation catalyst layer in the inner layer, and sufficient purification activity cannot be obtained. There was a drawback. Further, since this catalyst has a catalyst layer containing a noble metal component, it also has ternary performance in the vicinity of the theoretical air-fuel ratio, but due to the relationship between the thickness of the coating layer and the amount of the noble metal component supported, sufficient ternary performance is obtained. There was a drawback that it could not be obtained.
【０００４】従って本発明の目的は、耐久後であっても
リーンバーン雰囲気下で充分な排気浄化特性を有する排
ガス浄化用触媒を提供することにある。Accordingly, it is an object of the present invention to provide an exhaust gas purifying catalyst having sufficient exhaust gas purifying characteristics in a lean burn atmosphere even after endurance.
【０００５】[0005]
【課題を解決するための手段及び作用】本発明の上記の
目的は、触媒担体上に白金、パラジウム及びロジウムか
らなる群から選ばれた少なくとも１種の貴金属を含有す
る活性アルミナを主成分とした第１コート層を設け、該
第１コート層上に貴金属成分を含まない活性アルミナを
主成分とした無機物から成る第２コート層を設け、該第
２コート層上に金属をイオン交換したゼオライト粉末を
主成分とした無機物から成る第３コート層を設けてなる
触媒を触媒コンバーターの上流側に配置し、三元触媒を
前記コンバーターの下流側に配置したことを特徴とする
排ガス浄化用触媒により達成された。The above object of the present invention is based on activated alumina containing, as a main component, at least one noble metal selected from the group consisting of platinum, palladium and rhodium on a catalyst carrier. A first coat layer is provided, a second coat layer made of an inorganic material containing activated alumina as a main component containing no precious metal component is provided on the first coat layer, and a metal-ion-exchanged zeolite powder is provided on the second coat layer. A catalyst for exhaust gas purification, characterized in that a catalyst provided with a third coat layer made of an inorganic material containing as a main component is arranged upstream of the catalytic converter, and a three-way catalyst is arranged downstream of the converter. Was done.
【０００６】また、本発明の上記の目的は、触媒担体上
に白金を含有する活性アルミナを主成分とした第１コー
ト層を設け、該第１コート層上に貴金属成分を含まない
活性アルミナを主成分とした無機物から成る第２コート
層を設け、該第２コート層上に金属をイオン交換したゼ
オライト粉末を主成分とした無機物から成る第３コート
層を設けてなる触媒を触媒コンバーターの上流側に配置
し、貴金属成分としてパラジウムのみを含む三元触媒を
前記コンバーターの下流側に配置したことを特徴とする
排ガス浄化用触媒により達成された。以下、本発明を更
に詳細に説明する。Further, the above object of the present invention is to provide a first coat layer containing platinum-containing activated alumina as a main component on a catalyst carrier, and to provide activated alumina containing no precious metal component on the first coat layer. A catalyst comprising a second coat layer made of an inorganic substance having a main component, and a third coat layer made of an inorganic substance having a metal ion-exchanged zeolite powder as a main component is provided on the second coat layer upstream of a catalytic converter. And a three-way catalyst containing only palladium as a noble metal component on the downstream side of the converter. Hereinafter, the present invention will be described in more detail.
【０００７】まず、本発明においては、白金、パラジウ
ム及びロジウムからなる群から選ばれた少なくとも１種
の貴金属、又は白金を含む活性アルミナを主成分とした
無機物を触媒担体にコーティングして第１コート層を設
ける。この第１層目の触媒層は、リーン領域において酸
化触媒反応を生じさせ、特にＨＣやＣＯを浄化する。First, in the present invention, a catalyst support is coated with an inorganic substance containing at least one noble metal selected from the group consisting of platinum, palladium and rhodium, or active alumina containing platinum as a main component to form a first coat. Provide layers. The first catalyst layer causes an oxidation catalyst reaction in the lean region, and particularly purifies HC and CO.
【０００８】ここで、触媒担体としては、公知の触媒担
体の中から適宜選択して使用することができ、例えばモ
ノリス担体やメタル担体などが挙げられる。この触媒担
体の形状は、特に制限されないが、通常はハニカム形状
で使用することが好ましく、ハニカム状の各種基材に触
媒粉末を塗布して用いられる。このハニカム材料として
は、一般にコージエライト質のものが多く用いられる
が、金属材料からなるハニカムを用いることも可能であ
り、更には触媒粉末そのものをハニカム形状に成形して
も良い。触媒の形状をハニカム状とすることにより、触
媒と排気ガスの接触面積が大きくなり、圧力損失も抑え
られるため自動車用として用いる場合に極めて有利であ
る。Here, the catalyst carrier can be appropriately selected and used from known catalyst carriers, and examples thereof include a monolith carrier and a metal carrier. The shape of the catalyst carrier is not particularly limited, but it is usually preferable to use it in a honeycomb shape, and the catalyst powder is applied to various honeycomb-shaped base materials and used. As the honeycomb material, a cordierite material is generally used, but a honeycomb made of a metal material can be used, and the catalyst powder itself may be formed into a honeycomb shape. By making the shape of the catalyst honeycomb, the contact area between the catalyst and the exhaust gas becomes large and the pressure loss can be suppressed, which is extremely advantageous when used for automobiles.
【０００９】次に、上記第１コート層上に貴金属成分を
含まない活性アルミナを主成分とした無機物をコーティ
ングして第２コート層を設ける。この第２層目は、第１
層目の触媒で発生する酸化反応による反応熱を遮断する
ことによって、第３層目の触媒が耐久中に高温になるこ
とを防止して耐久劣化を抑制する働きと、第３層目の触
媒層に含まれる活性成分であるＣｕやＣｏが耐久により
ゼオライトの活性サイトから移動し第１層目の貴金属触
媒層に移動して性能を劣化させるのを抑制する働きとが
ある。Next, the second coat layer is formed by coating the first coat layer with an inorganic substance containing activated alumina containing no noble metal component as a main component. This second layer is the first
By blocking the reaction heat generated by the oxidation reaction generated in the catalyst of the third layer, the catalyst of the third layer is prevented from reaching a high temperature during its durability and the deterioration of durability is suppressed. Cu and Co, which are the active components contained in the layer, have the function of suppressing the deterioration of the performance by moving from the active site of the zeolite due to the durability and moving to the noble metal catalyst layer of the first layer.
【００１０】更に、上記第２コート層上に金属をイオン
交換したゼオライト粉末を主成分とした無機物をコーテ
ィングして第３コート層を設ける。イオン交換される金
属は、特に制限されないが、特に銅及び／又はコバルト
を用いることが好ましい。この第３層目は、酸素が多量
に含まれるエンジン排気ガスのリーン領域においてＮＯ
X の転化性能を有する。こうして得られた３層構造を有
する触媒を触媒コンバーターの上流側に配置する。Further, a third coat layer is provided by coating the second coat layer with an inorganic substance whose main component is zeolite powder in which a metal is ion-exchanged. The metal to be ion-exchanged is not particularly limited, but copper and / or cobalt is particularly preferably used. The third layer is NO in the lean region of the engine exhaust gas containing a large amount of oxygen.
It has X conversion performance. The catalyst having the three-layer structure thus obtained is arranged on the upstream side of the catalytic converter.
【００１１】本発明においては、前記上流側に配置され
た触媒では充分に浄化されずに残ったＨＣ、ＣＯ及びＮ
ＯX を、前記コンバータの下流側に配置された三元触媒
によって浄化することができる。また、このように１個
の触媒コンバーター内に異なる触媒を配置することによ
り、触媒全体の温度が上昇し低温であっても充分な触媒
性能を発揮することができる。[0011] In the present invention, HC, CO and N which are not sufficiently purified by the catalyst arranged on the upstream side and remain.
The O X, can be purified by a three-way catalyst disposed downstream of said converter. Further, by disposing different catalysts in one catalytic converter in this way, the temperature of the entire catalyst rises and sufficient catalytic performance can be exhibited even at low temperatures.
【００１２】本発明において使用するゼオライトとして
は、公知のゼオライトの中から適宜選択して使用するこ
とができ、特にＺＳＭ−５ゼオライト、モルデナイト及
びフェリエライト等が挙げられる。また、アルミナに担
持する金属としては、セリウム、ランタン以外の希土類
やジルコニア、バリウム、カルシウム及びカリウム等を
使用することができる。これらの金属の担持量はそれぞ
れの金属換算で１〜１５重量％の範囲であることが好ま
しい。The zeolite used in the present invention can be appropriately selected and used from known zeolites, and particularly ZSM-5 zeolite, mordenite, ferrierite and the like can be mentioned. Further, as the metal supported on the alumina, rare earths other than cerium and lanthanum, zirconia, barium, calcium, potassium and the like can be used. The supported amount of these metals is preferably in the range of 1 to 15% by weight in terms of each metal.
【００１３】[0013]
【実施例】以下、本発明を実施例によって更に詳述する
が、本発明はこれによって限定されるものではない。EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.
【００１４】実施例１ γ−アルミナを主成分とする活性アルミナ粉末１０００
ｇに対してジニトロジアンミン白金溶液を用いて白金
２．０重量％になるように加えよく攪拌した後、オーブ
ン中１５０℃で３時間乾燥し、４００℃で２時間、空気
気流中で焼成した。Example 1 1000 of activated alumina powder containing γ-alumina as a main component
Dinitrodiammine platinum solution was added to platinum in an amount of 2.0% by weight with respect to g, stirred well, dried in an oven at 150 ° C. for 3 hours, and calcined at 400 ° C. for 2 hours in an air stream.
【００１５】得られた白金担持活性アルミナ１５００
ｇ、γ−アルミナを主成分とする活性アルミナ８００
ｇ、１０重量％硝酸４６０ｇ及び水１８４０ｇをボール
ミルポットに投入し、８時間粉砕してスラリーを得た。
得られたスラリーをモノリス担体基材（１．２Ｌ、４０
０セル）に塗布して乾燥した後、４００℃で２時間、空
気雰囲気中で焼成した。この時の塗布量は、焼成後に６
０ｇ／個になるように設定した。The obtained platinum-supported activated alumina 1500
Activated alumina 800 containing g, γ-alumina as a main component
g, 10% by weight nitric acid (460 g) and water (1840 g) were charged into a ball mill pot and pulverized for 8 hours to obtain a slurry.
The resulting slurry was used as a monolith carrier substrate (1.2 L, 40
(0 cell) and dried, and then baked at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time is 6 after firing.
It was set to be 0 g / piece.
【００１６】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末２０００ｇ、１０重量％硝酸４００ｇ及び水
１６００ｇをボールミルポットに投入し、８時間粉砕し
て得たスラリーを焼成後に塗布量３０ｇ／個になるよう
に塗布し乾燥した後、４００℃で２時間、空気雰囲気中
で焼成した。Next, 2000 g of activated alumina powder containing γ-alumina as a main component, 400 g of 10% by weight nitric acid and 1600 g of water were put into a ball mill pot and pulverized for 8 hours to obtain a slurry, which was coated at a coating amount of 30 g / piece. After coating and drying so as to obtain the above composition, it was baked at 400 ° C. for 2 hours in an air atmosphere.
【００１７】更に、０．２ｍｏｌ／Ｌの硝酸銅又は酢酸
銅溶液５．２Ｋｇとゼオライト粉末２Ｋｇとを混合し攪
拌した後、濾過した。この操作を３回繰り返した後、乾
燥及び焼成してＣｕをイオン交換したゼオライト粉末を
調製した。このＣｕをイオン交換したゼオライト粉末１
８９０ｇ、シリカゾル（固形分２０％）１１５０ｇ及び
水１１００ｇを磁性ボールミルに投入し、粉砕して得た
スラリーを上記担体に焼成した後に塗布量２４０ｇ／個
になるように塗布し乾燥し、４００℃で２時間空気中で
焼成し、触媒１−Ａを調製した。Further, 5.2 kg of a 0.2 mol / L copper nitrate or copper acetate solution and 2 kg of zeolite powder were mixed, stirred and filtered. After repeating this operation 3 times, it dried and baked and the zeolite powder which ion-exchanged Cu was prepared. This Cu-ion exchanged zeolite powder 1
890 g, 1150 g of silica sol (solid content 20%) and 1100 g of water were charged into a magnetic ball mill, and the slurry obtained by pulverizing was calcinated on the above carrier, and then coated and dried at a coating amount of 240 g / unit at 400 ° C. The catalyst 1-A was prepared by firing in air for 2 hours.
【００１８】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対してジニトロジアンミン白金
溶液を用いて白金１．５重量％になるように加え良く攪
拌した後、オーブン中１５０℃で３時間乾燥し、４００
℃で２時間、空気気流中で焼成した。この白金担持活性
アルミナ１４００ｇ、酸化セリウム９３６ｇ、γ−アル
ミナを主成分とする活性アルミナ３２０ｇ及び硝酸酸性
ベーマイトゾル（ベーマイトアルミナ１０重量％けん濁
液に１０重量％硝酸を添加して得られるゾル）２２２１
ｇをボールミルポットに投入し、８時間粉砕してスラリ
ーを得た。得られたスラリーをモノリス担体基材（０．
７Ｌ、４００セル）に塗布し乾燥した後、４００℃で２
時間、空気雰囲気中で焼成した。この時の塗布量は、１
１０ｇ／個に設定した。Then, to 1000 g of activated alumina powder containing γ-alumina as a main component, a dinitrodiammine platinum solution was added so as to be 1.5% by weight of platinum, and the mixture was stirred well, and then the mixture was kept in an oven at 150 ° C. for 3 days. Dried for 400 hours
Firing was performed in an air stream for 2 hours at ℃. 1400 g of this platinum-supported activated alumina, 936 g of cerium oxide, 320 g of activated alumina containing γ-alumina as a main component, and nitric acid boehmite sol (sol obtained by adding 10 wt% nitric acid to 10 wt% boehmite alumina suspension) 2221
g was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The resulting slurry was used as a monolith carrier substrate (0.
7 L, 400 cells) and dried, then at 400 ℃ 2
Firing in air atmosphere for hours. The coating amount at this time is 1
It was set to 10 g / piece.
【００１９】更に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対して硝酸ロジウム溶液をロジ
ウム１重量％となるように加え良く攪拌した後、同様に
して乾燥及び焼成を行いロジウム担持アルミナ粉末を得
た。得られたロジウム担持アルミナ粉末５００ｇ、硝酸
酸性ベーマイトゾル６３７ｇ及びγ−アルミナを主成分
とする活性アルミナ粉末２６５ｇをボールミルポットに
投入し、８時間粉砕して得たスラリーを塗布量２８ｇ／
個になるように塗布した後、４００℃で２時間、空気雰
囲気中で焼成し触媒Ｂを調製した。Further, to 1000 g of activated alumina powder containing γ-alumina as a main component, a rhodium nitrate solution was added so that the amount of rhodium was 1% by weight, well stirred, and then dried and fired in the same manner to carry out rhodium-supporting alumina powder. Got 500 g of the obtained rhodium-supported alumina powder, 637 g of nitric acid-acidic boehmite sol, and 265 g of activated alumina powder containing γ-alumina as a main component were placed in a ball mill pot, and the slurry obtained by grinding for 8 hours was applied at a coating amount of 28 g /
After being coated so as to become individual pieces, the catalyst B was prepared by firing at 400 ° C. for 2 hours in an air atmosphere.
【００２０】こうして調製された触媒１−Ａを前方に、
触媒Ｂを後方に配置し１個の触媒コンバーター内に組み
込み触媒１とした。The catalyst 1-A thus prepared is forwardly charged,
The catalyst B was arranged at the rear and incorporated into one catalytic converter to obtain the catalyst 1.
【００２１】実施例２ イオン交換金属としてＣｕの代わりにＣｏを用いた他
は、実施例１と同様にして以下に示すように触媒２−Ａ
を調製した。実施例１と同様にモノリスハニカム担体
（１．２Ｌ ４００セル）に白金担持活性アルミナ層及
び活性アルミナ層をコーティングした。更に、その上に
０．２ｍｏｌ／Ｌの硝酸コバルト又は酢酸コバルト溶液
５．２Ｋｇとゼオライト粉末２Ｋｇとを混合し攪拌した
後、濾過を行った。Example 2 Catalyst 2-A was prepared in the same manner as in Example 1 except that Co was used as the ion-exchange metal instead of Cu, as shown below.
Was prepared. As in Example 1, a monolith honeycomb carrier (1.2 L 400 cells) was coated with a platinum-supported activated alumina layer and an activated alumina layer. Further, 5.2 kg of a 0.2 mol / L cobalt nitrate or cobalt acetate solution and 2 kg of zeolite powder were mixed and stirred, and then filtered.
【００２２】この操作を３回繰り返した後、乾燥及び焼
成を行いＣｏをイオン交換したゼオライト粉末１８９０
ｇ、シリカゾル（固形分２０％）１１５０ｇ及び水１１
００ｇを磁性ボールミルに投入し、粉砕して得たスラリ
ーを上記担体に焼成した後に塗布量２４０ｇ／個になる
ように塗布し乾燥した後、４００℃で２時間空気中で焼
成し、触媒２−Ａを調製した。After repeating this operation three times, the zeolite powder 1890 is ion-exchanged with Co by drying and firing.
g, silica sol (solid content 20%) 1150 g and water 11
00 g was put into a magnetic ball mill, and the slurry obtained by pulverizing was calcinated on the above carrier, then coated so as to have a coating amount of 240 g / unit, dried, and then calcined in air at 400 ° C. for 2 hours to prepare a catalyst 2- A was prepared.
【００２３】こうして調製された触媒２−Ａを前方に、
実施例１で得た触媒Ｂを後方に配置し１個の触媒コンバ
ーター内に組み込み触媒２とした。The catalyst 2-A prepared in this way
The catalyst B obtained in Example 1 was placed rearward to be incorporated into one catalytic converter to obtain a catalyst 2.
【００２４】実施例３ 白金の代わりにパラジウムを用いた他は、実施例１と同
様にして以下に示すように触媒３−Ａを調製した。γ−
アルミナを主成分とする活性アルミナ粉末１０００ｇに
対して硝酸パラジウム溶液を用いてパラジウム２．０重
量％になるように加えよく攪拌した後、オーブン中１５
０℃で３時間乾燥し、４００℃で２時間、空気気流中で
焼成した。Example 3 A catalyst 3-A was prepared in the same manner as in Example 1 except that palladium was used instead of platinum, as shown below. γ-
Palladium nitrate solution was added to 1000 g of activated alumina powder containing alumina as the main component so that 2.0 wt% of palladium was added, and the mixture was stirred well and then placed in an oven for 15
It was dried at 0 ° C. for 3 hours and calcined at 400 ° C. for 2 hours in an air stream.
【００２５】このパラジウム担持活性アルミナ１５００
ｇ、γ−アルミナを主成分とする活性アルミナ８００
ｇ、１０重量％硝酸４６０ｇ及び水１８４０ｇをボール
ミルポットに投入し、８時間粉砕してスラリーを得た。
得られたスラリーをモノリス担体基材（１．２Ｌ，４０
０セル）に塗布し乾燥した後、４００℃で２時間、空気
雰囲気中で焼成した。この時の塗布量は、焼成後に６０
ｇ／個になるように設定した。この触媒層上に実施例１
と同様にして活性アルミナ層、Ｃｕをイオン交換したゼ
オライト触媒層をコーティングし、触媒３−Ａを調製し
た。This palladium-supported activated alumina 1500
Activated alumina 800 containing g, γ-alumina as a main component
g, 10% by weight nitric acid (460 g) and water (1840 g) were charged into a ball mill pot and pulverized for 8 hours to obtain a slurry.
The resulting slurry was used as a monolith carrier substrate (1.2 L, 40
(0 cell), dried, and baked at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time is 60 after firing.
It was set to be g / piece. Example 1 on this catalyst layer
In the same manner as above, an activated alumina layer and a zeolite catalyst layer in which Cu was ion-exchanged were coated to prepare a catalyst 3-A.
【００２６】こうして調製された触媒３−Ａを前方に、
実施例１で得た触媒Ｂを後方に配置し１個のコンバータ
ー内に組み込み触媒３とした。The catalyst 3-A thus prepared is forwardly placed,
The catalyst B obtained in Example 1 was placed in the rear and incorporated into one converter to obtain the catalyst 3.
【００２７】実施例４ 白金のみに代えて白金及びロジウムを用いた他は、実施
例１と同様にして以下に示すように触媒４−Ａを調製し
た。γ−アルミナを主成分とする活性アルミナ粉末１０
００ｇに対してジニトロジアンミン白金溶液を用いて白
金１．６３重量％になるように加えよく攪拌した後、オ
ーブン中１５０℃で３時間乾燥し、４００℃で２時間、
空気気流中で焼成し白金担持活性アルミナを調製した。Example 4 A catalyst 4-A was prepared in the same manner as in Example 1 except that platinum and rhodium were used instead of only platinum. Activated alumina powder 10 containing γ-alumina as a main component
Dinitrodiammine platinum solution was added to platinum in an amount of 1.63% by weight with respect to 00 g, and the mixture was well stirred, dried in an oven at 150 ° C. for 3 hours, and at 400 ° C. for 2 hours.
The platinum-supported activated alumina was prepared by firing in an air stream.
【００２８】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対して硝酸ロジウム溶液をロジ
ウム１重量％となるように加え良く攪拌した後、乾燥及
び焼成を行いロジウム担持アルミナ粉末を調製した。こ
の白金担持活性アルミナ１４００ｇ、ロジウム担持活性
アルミナ４３４ｇ、酸化セリウム９３６ｇ及び硝酸酸性
ベーマイトゾル（ベーマイトアルミナ１０重量％けん濁
液に１０重量％硝酸を添加することによって得られるゾ
ル）２２２１ｇをボールミルポットに投入し、８時間粉
砕してスラリーを得た。得られたスラリーをモノリス担
体基材（１．２Ｌ，４００セル）に塗布し乾燥した後、
４００℃で２時間、空気雰囲気中で焼成した。この時の
塗布量は、焼成後に６０ｇ／個になるように設定した。
この触媒層上に実施例１と同様にしてＣｕをイオン交換
したゼオライト触媒層をコーティングし、触媒４−Ａを
調製した。Next, a rhodium nitrate solution was added to 1000 g of activated alumina powder containing γ-alumina as the main component so that the rhodium content was 1% by weight, and the mixture was well stirred and dried and calcined to prepare a rhodium-supporting alumina powder. did. 1400 g of this platinum-supported activated alumina, 434 g of rhodium-supported activated alumina, 936 g of cerium oxide and 2221 g of nitric acid-acidic boehmite sol (sol obtained by adding 10 wt% nitric acid to 10 wt% boehmite alumina suspension) were placed in a ball mill pot. And crushed for 8 hours to obtain a slurry. After applying the obtained slurry to a monolith carrier substrate (1.2 L, 400 cells) and drying,
Firing was performed at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time was set to be 60 g / piece after firing.
On this catalyst layer, a zeolite catalyst layer having Cu ion-exchanged was coated in the same manner as in Example 1 to prepare catalyst 4-A.
【００２９】こうして調製された触媒４−Ａを前方に、
実施例１で得た触媒Ｂを後方に配置し１個のコンバータ
ー内に組み込み触媒４とした。The catalyst 4-A thus prepared is forwardly placed,
The catalyst B obtained in Example 1 was placed in the rear and incorporated into one converter to obtain the catalyst 4.
【００３０】実施例５ 活性アルミナの代わりにセリウム担持活性アルミナを用
いた他は、実施例１と同様にして以下に示すように触媒
５−Ａを調製した。貴金属担持アルミナ触媒層を実施例
１と同様にしてハニカム担体にコーティングした。Example 5 A catalyst 5-A was prepared in the same manner as in Example 1 except that cerium-supported activated alumina was used instead of activated alumina. A honeycomb carrier was coated with the noble metal-supported alumina catalyst layer in the same manner as in Example 1.
【００３１】次に、セリウム３重量％を含有するセリウ
ム担持活性アルミナ粉末２０００ｇ、１０重量％硝酸４
００ｇ及び水１６００ｇをボールミルポットに投入し、
８時間粉砕して得たスラリーを焼成した後の塗布量３０
ｇ／個になるように塗布し乾燥した後、４００℃で２時
間、空気雰囲気中で焼成した。この触媒層上に実施例１
と同様にしてＣｕをイオン交換したゼオライト触媒層を
コーティングし、触媒５ーＡを調製した。Next, 2000 g of cerium-supporting activated alumina powder containing 3% by weight of cerium, 10% by weight of nitric acid 4
Pour 00g and 1600g of water into the ball mill pot,
Application amount after firing slurry obtained by grinding for 8 hours 30
After coating so as to be g / piece and drying, it was baked at 400 ° C. for 2 hours in an air atmosphere. Example 1 on this catalyst layer
In the same manner as above, a zeolite catalyst layer having Cu ion-exchanged was coated to prepare catalyst 5-A.
【００３２】こうして調製された触媒５−Ａを前方に、
実施例１で得たＢを後方に配置し１個の触媒コンバータ
ー内に組み込み触媒５とした。The catalyst 5-A thus prepared is forwardly placed,
B obtained in Example 1 was placed rearward and incorporated into one catalytic converter to obtain a catalyst 5.
【００３３】実施例６ 活性アルミナの代わりにセリウム及びランタン担持活性
アルミナを用いた他は、実施例１と同様にして以下に示
すように触媒６−Ａを調製した。貴金属担持アルミナ触
媒層を実施例１と同様にしてハニカム担体にコーティン
グした。Example 6 Catalyst 6-A was prepared in the same manner as in Example 1 except that activated alumina supporting cerium and lanthanum was used instead of activated alumina. A honeycomb carrier was coated with the noble metal-supported alumina catalyst layer in the same manner as in Example 1.
【００３４】次に、セリウム３重量％及びランタン３重
量％を含有するセリウム及びランタン担持活性アルミナ
粉末２０００ｇ、１０重量％硝酸４００ｇ及び水１６０
０ｇをボールミルポットに投入し、８時間粉砕して得た
スラリーを焼成した後の塗布量３０ｇ／個になるように
塗布し乾燥した後、４００℃で２時間、空気雰囲気中で
焼成した。この触媒層上に実施例１と同様にしてＣｕを
イオン交換したゼオライト触媒層をコーティングし、触
媒６−Ａを調製した。Next, 2000 g of activated alumina powder supporting cerium and lanthanum containing 3% by weight of cerium and 3% by weight of lanthanum, 400 g of 10% by weight nitric acid and 160 of water.
0 g was put into a ball mill pot, and the slurry obtained by pulverizing for 8 hours was applied so that the coating amount after firing was 30 g / piece, dried, and then fired at 400 ° C. for 2 hours in an air atmosphere. A catalyst catalyst ion-exchanged zeolite catalyst layer was coated on this catalyst layer in the same manner as in Example 1 to prepare catalyst 6-A.
【００３５】こうして調製された触媒６−Ａを前方に、
実施例１で得た触媒Ｂを後方に配置し、１個の触媒コン
バーター内に組み込み触媒６とした。The catalyst 6-A thus prepared is forwardly charged,
The catalyst B obtained in Example 1 was arranged at the rear, and the catalyst 6 was incorporated in one catalytic converter.
【００３６】実施例７ ジニトロジアンミン白金溶液を用いて白金１．６３重量
％になるように加えたことに代えて硝酸パラジウム溶液
を用いてパラジウム２．００重量％になるように加えた
他は、実施例４と全く同様にして触媒７−Ａを調製し
た。EXAMPLE 7 Platinum nitrate solution was added instead of 1.63 wt% platinum using dinitrodiammine platinum solution, and 2.00 wt% palladium was added using palladium nitrate solution. Catalyst 7-A was prepared in exactly the same manner as in Example 4.
【００３７】こうして調製された触媒７−Ａを前方に、
実施例１で得た触媒Ｂを後方に配置し１個の触媒コンバ
ーター内に組み込み触媒７とした。The catalyst 7-A prepared in this way
The catalyst B obtained in Example 1 was placed rearward to be a catalyst 7 incorporated in one catalytic converter.
【００３８】実施例８ 触媒Ｂの貴金属として白金の代わりにパラジウムを用い
た他は、実施例１と同様にして以下に示すように触媒Ｃ
を調製した。γ−アルミナを主成分とする活性アルミナ
粉末１０００ｇに対して硝酸パラジウム溶液を用いてパ
ラジウム１．７重量％になるように加え良く攪拌した
後、オーブン中１５０℃で３時間乾燥し、４００℃で２
時間、空気気流中で焼成した。Example 8 Catalyst C was prepared in the same manner as in Example 1 except that palladium was used instead of platinum as the noble metal of catalyst B, as shown below.
Was prepared. To 1000 g of activated alumina powder containing γ-alumina as the main component, a palladium nitrate solution was used to add 1.7% by weight of palladium, and the mixture was stirred well and then dried in an oven at 150 ° C. for 3 hours and at 400 ° C. Two
It was fired in a stream of air for a period of time.
【００３９】このパラジウム担持活性アルミナ１４００
ｇ、酸化セリウム９３６ｇ、γ−アルミナを主成分とす
る活性アルミナ３２０ｇ及び硝酸酸性ベーマイトゾル
（ベーマイトアルミナ１０重量％けん濁液に１０重量％
硝酸を添加することによって得られるゾル）２２２１ｇ
をボールミルポットに投入し、８時間粉砕してスラリー
を得た。得られたスラリーをモノリス担体基材（１．０
Ｌ、４００セル）に塗布し乾燥した後、４００℃で２時
間、空気雰囲気中で焼成した。この時の塗布量は１５７
ｇ／個に設定した。This palladium-supported activated alumina 1400
g, 936 g of cerium oxide, 320 g of activated alumina containing γ-alumina as a main component, and nitric acid boehmite sol (10% by weight of boehmite alumina 10% by weight suspension)
2221 g of sol obtained by adding nitric acid)
Was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The resulting slurry was used as a monolith carrier substrate (1.0
L, 400 cells) and dried, followed by firing at 400 ° C. for 2 hours in an air atmosphere. The application amount at this time is 157
It was set to g / piece.
【００４０】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対して硝酸ロジウム溶液をロジ
ウム１重量％となるように加え良く攪拌した後、乾燥及
び焼成を行いロジウム担持アルミナ粉末を作成した。こ
のロジウム担持アルミナ粉末１８４ｇ、硝酸酸性ベーマ
イトゾル６３７ｇ及びγ−アルミナを主成分とする活性
アルミナ粉末５８１ｇをボールミルポットに投入し、８
時間粉砕して得たスラリーを塗布量４０ｇ／個になるよ
うに塗布し乾燥した後、４００℃で２時間、空気雰囲気
中で焼成し、触媒Ｃを調製した。Next, a rhodium nitrate solution was added to 1000 g of activated alumina powder containing γ-alumina as the main component so that the amount of rhodium was 1% by weight, and the mixture was thoroughly stirred and dried and calcined to prepare a rhodium-supported alumina powder. did. 184 g of this rhodium-supported alumina powder, 637 g of nitric acid-acidified boehmite sol, and 581 g of activated alumina powder containing γ-alumina as a main component were put into a ball mill pot, and 8
The slurry obtained by pulverizing for an hour was applied so as to have a coating amount of 40 g / piece, dried, and then calcined at 400 ° C. for 2 hours in an air atmosphere to prepare a catalyst C.
【００４１】実施例１で得た触媒１−Ａを前方に、この
触媒Ｃを後方に配置し１個の触媒コンバーター内に組み
込み触媒８とした。The catalyst 1-A obtained in Example 1 was placed on the front side, and the catalyst C was placed on the back side to form a catalyst 8 incorporated in one catalytic converter.
【００４２】実施例９ 前方の触媒を０．９Ｌとし後方の触媒を１．０Ｌとした
他は、実施例１の触媒１−Ａ及び触媒Ｂと同様にして以
下に示すように触媒８−Ａ及び触媒Ｄを調製した。γ−
アルミナを主成分とする活性アルミナ粉末１０００ｇに
対してジニトロジアンミン白金溶液を用いて白金２．０
重量％になるように加え良く攪拌した後、オーブン中１
５０℃で３時間乾燥し、４００℃で２時間、空気雰囲気
中で焼成した。この白金担持活性アルミナ１５００ｇ、
γ−アルミナを主成分とする活性アルミナ８００ｇ、１
０重量％硝酸４６０ｇ及び水１８４０ｇをボールミルポ
ットに投入し、８時間粉砕してスラリーを得た。得られ
たスラリーをモノリス担体基材（０．９Ｌ、４００セ
ル）に塗布し乾燥した後、４００℃で２時間、空気雰囲
気中で焼成した。この時の塗布量は、焼成後に４５ｇ／
個になるように設定した。Example 9 Catalyst 8-A was prepared as shown below in the same manner as catalyst 1-A and catalyst B of Example 1 except that the front catalyst was 0.9 L and the rear catalyst was 1.0 L. And Catalyst D were prepared. γ-
Using 1000 g of activated alumina powder containing alumina as a main component, a dinitrodiammine platinum solution was used to prepare platinum 2.0.
Add to the weight% and stir well, then in the oven 1
It was dried at 50 ° C. for 3 hours and calcined at 400 ° C. for 2 hours in an air atmosphere. 1500 g of this platinum-supported activated alumina,
800 g of activated alumina containing γ-alumina as a main component, 1
460 g of 0 wt% nitric acid and 1840 g of water were put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The obtained slurry was applied to a monolith carrier substrate (0.9 L, 400 cells), dried, and then fired at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time is 45 g /
I set it to be individual.
【００４３】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末２０００ｇ、１０重量％硝酸４００ｇ及び水
１６００ｇをボールミルポットに投入し、８時間粉砕し
て得たスラリーを焼成後の塗布量２３ｇ／個になるよう
に塗布し乾燥した後、４００℃で２時間、空気雰囲気中
で焼成した。Next, 2000 g of activated alumina powder containing γ-alumina as a main component, 400 g of 10% by weight nitric acid and 1600 g of water were put into a ball mill pot and pulverized for 8 hours to obtain a slurry, and the coating amount after baking was 23 g / After coating so as to form individual pieces and drying, they were baked at 400 ° C. for 2 hours in an air atmosphere.
【００４４】更に、０．２ｍｏｌ／Ｌの硝酸銅又は酢酸
銅溶液５．２Ｋｇとゼオライト粉末２Ｋｇを混合し攪拌
した後、ろ過した。この操作を３回繰り返した後、乾燥
及び焼成を行いＣｕをイオン交換したゼオライト粉末を
調製した。このＣｕをイオン交換したゼオライト粉末１
８９０ｇ、シリカゾル（固形分２０％）１１５０ｇ及び
水１１００ｇを磁性ボールミルに投入し、粉砕して得た
スラリーを上記担体に焼成後に塗布量１８０ｇ／個にな
るように塗布し乾燥した後、４００℃で２時間空気中で
焼成し、触媒８−Ａを調製した。Further, 5.2 kg of 0.2 mol / L copper nitrate or copper acetate solution and 2 kg of zeolite powder were mixed and stirred, and then filtered. After repeating this operation three times, it was dried and calcined to prepare a zeolite powder in which Cu was ion-exchanged. This Cu-ion exchanged zeolite powder 1
890 g, 1150 g of silica sol (solid content 20%) and 1100 g of water were put into a magnetic ball mill, and the slurry obtained by pulverizing was applied to the above carrier so as to have a coating amount of 180 g / unit, dried, and then at 400 ° C. It was calcined in air for 2 hours to prepare catalyst 8-A.
【００４５】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対してジニトロジアンミン白金
溶液を用いて白金１．５重量％になるように加え良く攪
拌した後、オーブン中１５０℃で３時間乾燥し、４００
℃で２時間、空気気流中で焼成した。この白金担持活性
アルミナ１４００ｇ、酸化セリウム９３６ｇ、γ−アル
ミナを主成分とする活性アルミナ３２０ｇ及び硝酸酸性
ベーマイトゾル（ベーマイトアルミナ１０重量％けん濁
液に１０重量％硝酸を添加することによって得られるゾ
ル）２２２１ｇをボールミルポットに投入し、８時間粉
砕してスラリーを得た。得られたスラリーをモノリス担
体基材（１．０Ｌ、４００セル）に塗布し乾燥した後、
４００℃で２時間、空気雰囲気中で焼成した。この時の
塗布量は１４５ｇ／個に設定した。Next, to 1000 g of activated alumina powder containing γ-alumina as a main component, a dinitrodiammine platinum solution was added so as to be 1.5% by weight of platinum, and the mixture was stirred well, and then, in an oven at 150 ° C. for 3 days. Dried for 400 hours
Firing was performed in an air stream for 2 hours at ℃. 1400 g of this platinum-supported activated alumina, 936 g of cerium oxide, 320 g of activated alumina containing γ-alumina as a main component, and nitric acid acidic boehmite sol (sol obtained by adding 10% by weight nitric acid to 10% by weight boehmite alumina suspension). 2221 g was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. After applying the obtained slurry to a monolith carrier substrate (1.0 L, 400 cells) and drying,
Firing was performed at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time was set to 145 g / piece.
【００４６】更に、γ−アルミナを主成分とする活性ア
ルミナ粉末１０００ｇに対して硝酸ロジウム溶液をロジ
ウム１重量％となるように加え良く攪拌した後、乾燥及
び焼成してロジウム担持アルミナ粉末を作成した。この
ロジウム担持アルミナ粉末５００ｇ、硝酸酸性ベーマイ
トゾル６３７ｇ及びγ−アルミナを主成分とする活性ア
ルミナ粉末２６５ｇをボールミルポットに投入し、８時
間粉砕して得たスラリーを塗布量３６ｇ／個になるよう
に塗布し乾燥した後、４００℃で２時間、空気雰囲気中
で焼成して、触媒Ｄを調製した。Further, a rhodium nitrate solution was added to 1000 g of activated alumina powder containing γ-alumina as a main component so that the amount of rhodium was 1% by weight, stirred well, and dried and calcined to prepare a rhodium-supported alumina powder. . 500 g of this rhodium-supported alumina powder, 637 g of nitric acid boehmite sol, and 265 g of activated alumina powder containing γ-alumina as a main component were placed in a ball mill pot, and the slurry obtained by pulverizing for 8 hours was applied at a coating amount of 36 g / piece. After coating and drying, the catalyst D was prepared by baking at 400 ° C. for 2 hours in an air atmosphere.
【００４７】こうして調製された触媒８−Ａを前方に、
この触媒Ｄを後方に配置し１個の触媒コンバーター内に
組み込み触媒９とした。The catalyst 8-A thus prepared was forwardly charged,
This catalyst D was arranged at the rear side to form a catalyst 9 incorporated in one catalytic converter.
【００４８】実施例１０ 実施例１と全く同様な方法により触媒１−Ａを調製し
た。次に、γ−アルミナを主成分とする活性アルミナ粉
末１０００ｇに対して硝酸パラジウム溶液を用いてパラ
ジウム１．５４重量％になるように加え良く攪拌した
後、オーブン中１５０℃で３時間乾燥し、４００℃で２
時間、空気気流中で焼成した。Example 10 Catalyst 1-A was prepared in exactly the same manner as in Example 1. Next, after adding 1000 g of activated alumina powder containing γ-alumina as a main component to a palladium nitrate solution so as to be 1.54% by weight of palladium, stirring well, and drying in an oven at 150 ° C. for 3 hours, 2 at 400 ° C
It was fired in a stream of air for a period of time.
【００４９】このパラジウム担持活性アルミナ１４００
ｇ、酸化セリウム９３６ｇ、γ−アルミナを主成分とす
る活性アルミナ３２０ｇ及び硝酸酸性ベーマイトゾル
（ベーマイトアルミナ１０重量％けん濁液に１０重量％
硝酸を添加することによって得られるゾル）２２２１ｇ
をボールミルポットに投入し、８時間粉砕してスラリー
を得た。得られたスラリーをモノリス担体基材（０．７
Ｌ、４００セル）に塗布し乾燥した後、４００℃で２時
間、空気雰囲気中で焼成した。この時の塗布量を１４０
ｇ／個に設定して、これを触媒Ｅとした。This palladium-supported activated alumina 1400
g, 936 g of cerium oxide, 320 g of activated alumina containing γ-alumina as a main component, and nitric acid boehmite sol (10% by weight of boehmite alumina 10% by weight suspension)
2221 g of sol obtained by adding nitric acid)
Was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The resulting slurry was used as a monolith carrier substrate (0.7
L, 400 cells) and dried, followed by firing at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time is 140
This was designated as catalyst E by setting it to g / piece.
【００５０】実施例で得た触媒１−Ａを前方に、この触
媒Ｅを後方に配置し１個の触媒コンバーター内に組み込
み触媒１０とした。The catalyst 1-A obtained in the example was placed in the front and the catalyst E was placed in the back to form a catalyst 10 incorporated in one catalytic converter.
【００５１】実施例１１ 実施例２で得た触媒２−Ａを前方に、実施例１０で得た
触媒Ｅを後方に配置し１個の触媒コンバーター内に組み
込み触媒１１とした。Example 11 The catalyst 2-A obtained in Example 2 was placed in the front, and the catalyst E obtained in Example 10 was placed in the rear to make a catalyst 11 incorporated in one catalytic converter.
【００５２】実施例１２ 実施例５で得た触媒５−Ａを前方に、実施例１０で得た
触媒Ｅを後方に配置し１個の触媒コンバーター内に組み
込み触媒１２とした。Example 12 The catalyst 5-A obtained in Example 5 was placed in the front, and the catalyst E obtained in Example 10 was placed in the back to form a catalyst 12 incorporated in one catalytic converter.
【００５３】実施例１３ 実施例９と同様にして触媒８−Ａを調製した。次に、γ
−アルミナを主成分とする活性アルミナ粉末１０００ｇ
に対して硝酸パラジウム溶液を用いてパラジウム１．７
重量％になるように加え良く攪拌した後、オーブン中１
５０℃で３時間乾燥し、４００℃で２時間、空気気流中
で焼成した。Example 13 Catalyst 8-A was prepared in the same manner as in Example 9. Then γ
1000 g of activated alumina powder containing alumina as a main component
Against palladium 1.7 using palladium nitrate solution
Add to the weight% and stir well, then in the oven 1
It was dried at 50 ° C. for 3 hours and calcined at 400 ° C. for 2 hours in an air stream.
【００５４】このパラジウム担持活性アルミナ１４００
ｇ、酸化セリウム９３６ｇ、γ−アルミナを主成分とす
る活性アルミナ３２０ｇ及び硝酸酸性ベーマイトゾル
（ベーマイトアルミナ１０重量％けん濁液に１０重量％
硝酸を添加することによって得られるゾル）２２２１ｇ
をボールミルポットに投入し、８時間粉砕してスラリー
を得た。得られたスラリーをモノリス担体基材（１．０
Ｌ、４００セル）に塗布し乾燥した後、４００℃で２時
間、空気雰囲気中で焼成し、触媒Ｃを調製した。この時
の塗布量は、２００ｇ／個に設定した。This palladium-supported activated alumina 1400
g, 936 g of cerium oxide, 320 g of activated alumina containing γ-alumina as a main component, and nitric acid boehmite sol (10% by weight of boehmite alumina 10% by weight suspension)
2221 g of sol obtained by adding nitric acid)
Was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The resulting slurry was used as a monolith carrier substrate (1.0
L, 400 cells) and dried, followed by firing at 400 ° C. for 2 hours in an air atmosphere to prepare a catalyst C. The coating amount at this time was set to 200 g / piece.
【００５５】実施例９で得た触媒８−Ａを前方に、この
触媒Ｃを後方に配置し、１個の触媒コンバーター内に組
み込み触媒１３とした。The catalyst 8-A obtained in Example 9 was placed on the front side, and the catalyst C was placed on the back side to form a catalyst 13 incorporated in one catalytic converter.
【００５６】実施例１４ 白金を含む活性アルミナのコーティング量を４８ｇ／個
及び貴金属成分を含まない活性アルミナのコーティング
量を４８ｇ／個とした他は、実施例１０と同様にして以
下のように触媒９−Ａ及び触媒Ｅを調製した。γ−アル
ミナを主成分とする活性アルミナ粉末１０００ｇに対し
てジニトロジアンミン白金溶液を用いて白金２．０重量
％になるように加え良く攪拌した後、オーブン中１５０
℃で３時間乾燥し、４００℃で２時間空気気流中で焼成
した。この白金担持活性アルミナ１５００ｇ、γ−アル
ミナを主成分とする活性アルミナ８００ｇ、１０重量％
硝酸４６０ｇ及び水１８４０ｇをボールミルポットに投
入し、８時間粉砕してスラリーを得た。Example 14 A catalyst was prepared in the same manner as in Example 10 except that the coating amount of activated alumina containing platinum was 48 g / piece and the coating amount of activated alumina containing no precious metal component was 48 g / piece. 9-A and catalyst E were prepared. Dinitrodiammine platinum solution was added to 1000 g of activated alumina powder containing γ-alumina as a main component so that the amount of platinum was 2.0% by weight, and the mixture was stirred well and then heated in an oven at 150
It was dried at ℃ for 3 hours and calcined at 400 ℃ for 2 hours in an air stream. 1500 g of this platinum-supported activated alumina, 800 g of activated alumina mainly containing γ-alumina, 10% by weight
Nitric acid (460 g) and water (1840 g) were put into a ball mill pot and pulverized for 8 hours to obtain a slurry.
【００５７】得られたスラリーをモノリス担体基材
（１．２Ｌ、４００セル）に塗布し乾燥した後、４００
℃で２時間、空気雰囲気中で焼成した。この時の塗布量
は、焼成後に４８ｇ／個になるように設定した。次に、
γ−アルミナを主成分とする活性アルミナ粉末２０００
ｇ、１０重量％硝酸４００ｇ及び水１６００ｇをボール
ミルポットに投入し、８時間粉砕して得たスラリーを焼
成した後の塗布量４８ｇ／個になるように塗布し乾燥し
た後、４００℃で２時間、空気雰囲気中で焼成した。The obtained slurry was applied to a monolith carrier substrate (1.2 L, 400 cells) and dried, and then 400
Firing was performed in an air atmosphere for 2 hours at ℃. The coating amount at this time was set to be 48 g / piece after firing. next,
Activated alumina powder 2000 containing γ-alumina as a main component
g, 10 wt% nitric acid 400 g and water 1600 g were put into a ball mill pot, and the slurry obtained by pulverizing for 8 hours was applied so that the applied amount after baking was 48 g / piece, dried, and then at 400 ° C. for 2 hours. , Fired in an air atmosphere.
【００５８】更に、０．２ｍｏｌ／Ｌの硝酸銅又は酢酸
銅溶液５．２Ｋｇとゼオライト粉末２Ｋｇを混合し攪拌
した後、ろ過を行った。この操作を３回繰り返した後、
乾燥及び焼成を行いＣｕをイオン交換したゼオライト粉
末を調製した。このＣｕをイオン交換したゼオライト粉
末１８９０ｇ、シリカゾル（固形分２０％）１１５０ｇ
及び水１１００ｇを磁性ボールミルに投入し、粉砕して
得たスラリーを上記担体に焼成した後に塗布量２４０ｇ
／個になるように塗布し乾燥した後、４００℃で２時間
空気中で焼成し、触媒９−Ａを調製した。Further, 0.2 kg / L copper nitrate or copper acetate solution (5.2 kg) and zeolite powder (2 kg) were mixed and stirred, and then filtered. After repeating this operation 3 times,
Drying and firing were performed to prepare a zeolite powder in which Cu was ion-exchanged. This Cu ion-exchanged zeolite powder 1890 g, silica sol (solid content 20%) 1150 g
And 1100 g of water were put into a magnetic ball mill, and the slurry obtained by pulverizing was calcinated on the above carrier, and then the coating amount was 240 g.
After coating and drying so that the number would be /, the catalyst 9-A was prepared by baking in air at 400 ° C for 2 hours.
【００５９】こうして調製された触媒９−Ａを前方に、
実施例１０で得た触媒Ｅを後方に配置し１個の触媒コン
バーター内に組み込み触媒１４とした。The catalyst 9-A prepared in this way
The catalyst E obtained in Example 10 was placed rearward and incorporated into one catalytic converter to obtain a catalyst 14.
【００６０】実施例１５ 白金を含む活性アルミナのコーティング層中の白金担持
活性アルミナの量の比率を半分にした他は、実施例１０
と同様にして触媒１０ーＡを調製した。Example 15 Example 10 is repeated except that the ratio of the amount of platinum-loaded activated alumina in the coating layer of activated alumina containing platinum is halved.
Catalyst 10-A was prepared in the same manner as in.
【００６１】γ−アルミナを主成分とする活性アルミナ
粉末１０００ｇに対してジニトロジアンミン白金溶液を
用いて白金２．０重量％になるように加え良く攪拌した
後、オーブン中１５０℃で３時間乾燥し、４００℃で２
時間空気気流中で焼成した。この白金担持活性アルミナ
７５０ｇ、γ−アルミナを主成分とする活性アルミナ粉
末１５５０ｇ、１０重量％硝酸４６０ｇ及び水１８４０
ｇをボールミルポットに投入し、８時間粉砕してスラリ
ーを得た。得られたスラリーをモノリス担体基材（１．
２Ｌ、４００セル）に塗布し乾燥した後、４００℃で２
時間、空気雰囲気中で焼成した。この時の塗布量は、焼
成後に６０ｇ／個になるように設定した。Dinitrodiammine platinum solution was added to 1000 g of activated alumina powder containing γ-alumina as the main component so that the amount of platinum was 2.0% by weight, and the mixture was stirred well and dried in an oven at 150 ° C. for 3 hours. 2 at 400 ° C
Firing in air stream for hours. 750 g of this platinum-supported activated alumina, 1550 g of activated alumina powder containing γ-alumina as the main component, 460 g of 10% by weight nitric acid and 1840 of water.
g was put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The resulting slurry was used as a monolith carrier substrate (1.
2 L, 400 cells) and dried, then at 400 ℃ 2
Firing in air atmosphere for hours. The coating amount at this time was set to be 60 g / piece after firing.
【００６２】次に、γ−アルミナを主成分とする活性ア
ルミナ粉末２０００ｇ、１０重量％硝酸４００ｇ及び水
１６００ｇをボールミルポットに投入し、８時間粉砕し
て得たスラリーを焼成後の塗布量３０ｇ／個になるよう
に塗布し乾燥した後、４００℃で２時間、空気雰囲気中
で焼成した。Next, 2000 g of activated alumina powder containing γ-alumina as a main component, 400 g of 10% by weight nitric acid and 1600 g of water were put into a ball mill pot and pulverized for 8 hours to obtain a slurry, and the coating amount after firing was 30 g / After coating so as to form individual pieces and drying, they were baked at 400 ° C. for 2 hours in an air atmosphere.
【００６３】更に、０．２ｍｏｌ／Ｌの硝酸銅又は酢酸
銅溶液５．２Ｋｇとゼオライト粉末２Ｋｇを混合し攪拌
した後、ろ過を行った。この操作を３回繰り返した後、
乾燥及び焼成を行いＣｕをイオン交換したゼオライト粉
末を調製した。このＣｕをイオン交換したゼオライト粉
末１８９０ｇ、シルカゾル（固形分２０％）１１５０ｇ
及び水１１００ｇを磁性ボールミルに投入し、粉砕して
得たスラリーを上記担体に焼成した後に、塗布量２４０
ｇ／個になるように塗布し乾燥した後、４００℃で２時
間、空気中で焼成し触媒１０ーＡを調製した。Furthermore, 0.2 kg / L of copper nitrate or copper acetate solution (5.2 kg) and zeolite powder (2 kg) were mixed and stirred, and then filtered. After repeating this operation 3 times,
Drying and firing were performed to prepare a zeolite powder in which Cu was ion-exchanged. This Cu-ion exchanged zeolite powder 1890 g, Silkasol (solid content 20%) 1150 g
Then, 1100 g of water and 1100 g of water were put into a magnetic ball mill, and the slurry obtained by pulverizing was calcinated on the above carrier, and then the coating amount was 240
After being coated so as to be g / unit and dried, it was calcined in air at 400 ° C. for 2 hours to prepare a catalyst 10-A.
【００６４】こうして調製された触媒１０ーＡを前方に
触媒Ｂを後方に配置し１個の触媒コンバーター内に組み
込み触媒１５とした。The catalyst 10-A thus prepared was placed in the front and the catalyst B was placed in the back, and the catalyst 15 was incorporated in one catalytic converter.
【００６５】比較例１ 実施例１で得られた触媒１−Ａのみを単独で触媒コンバ
ーター内に組み込み触媒１６とした。Comparative Example 1 Only the catalyst 1-A obtained in Example 1 was incorporated as a catalyst 16 into the catalytic converter alone.
【００６６】比較例２ 実施例１で得られた触媒Ｂのみを単独で触媒コンバータ
ー内に組み込み触媒１７とした。Comparative Example 2 Only the catalyst B obtained in Example 1 was incorporated alone into the catalytic converter to obtain the catalyst 17.
【００６７】比較例３ 実施例１の触媒１−Ａと同様にしてゼオライト触媒層の
みをコーティングし、乾燥及び焼成して調製した触媒１
１−Ａを前方に、実施例１で得た触媒Ｂを後方に配置し
て触媒コンバーターに組み込み触媒１８とした。Comparative Example 3 Catalyst 1 prepared by coating only the zeolite catalyst layer, drying and calcining in the same manner as catalyst 1-A of Example 1.
1-A was placed on the front side and the catalyst B obtained in Example 1 was placed on the back side to form a catalyst 18 incorporated in a catalytic converter.
【００６８】比較例４ 実施例１０で得られた触媒１０−Ａのみを単独で触媒コ
ンバーターに組み込み触媒１９とした。Comparative Example 4 Only the catalyst 10-A obtained in Example 10 was incorporated into a catalytic converter alone to obtain a catalyst 19.
【００６９】比較例５ 実施例１で得られた触媒Ｅのみを単独で触媒コンバータ
ー内に組み込み触媒２０とした。Comparative Example 5 Only the catalyst E obtained in Example 1 was incorporated alone into the catalytic converter to obtain the catalyst 20.
【００７０】比較例６ 実施例１０で得られた触媒１０−Ａと同様にしてゼオラ
イト触媒層のみをコーティングし、乾燥及び焼成して調
製した触媒１１−Ａを前方に、実施例１０で得た触媒Ｅ
を後方に配置して触媒コンバーターに組み込み触媒２１
とした。Comparative Example 6 Catalyst 11-A prepared by coating only the zeolite catalyst layer in the same manner as Catalyst 10-A obtained in Example 10, drying and calcining was obtained in the forward direction in Example 10. Catalyst E
Is installed in the rear and is installed in the catalytic converter.
And
【００７１】各実施例及び比較例について、表１及び表
２に示す触媒を用いてエンジン排気ガスを下記条件で処
理し、耐久及び性能評価試験を行った。その結果を表３
及び４に示す。For each of the examples and comparative examples, engine exhaust gas was treated under the following conditions using the catalysts shown in Tables 1 and 2, and durability and performance evaluation tests were conducted. The results are shown in Table 3.
And 4 are shown.
【００７２】[0072]
【表１】 [Table 1]
【００７３】[0073]
【表２】 [Table 2]
【００７４】[0074]
【表３】 [Table 3]
【００７５】[0075]
【表４】 [Table 4]
【００７６】耐久条件 エンジン 排気量２０００ｃｃ 耐久温度 ５５０℃ 耐久時間 ５０時間 耐久中入口エミッション ＣＯ ０．４〜０．６％ Ｏ2 ０．５±０．１％ ＮＯ １５００ｐｐｍ ＨＣ １０００ｐｐｍ ＣＯ2 １４．９±０．１％性能評価条件 エンジン 排気量２０００ｃｃ 触媒入口Ａ／Ｆ １４．７及び２０．０ 空間速度 約４０，０００ｈ-1 Endurance conditions Engine displacement 2000 cc Endurance temperature 550 ° C Endurance time 50 hours Endurance medium inlet emission CO 0.4 to 0.6% O 2 0.5 ± 0.1% NO 1500 ppm HC 1000 ppm CO 2 14.9 ± 0.1% Performance evaluation conditions Engine displacement 2000 cc Catalyst inlet A / F 14.7 and 20.0 Space velocity Approximately 40,000 h -1
【００７７】[0077]
【発明の効果】本発明の排ガス浄化用触媒によれば、耐
久後にリーンバーン雰囲気下で充分な排気浄化特性を持
ち、かつリーンバーン雰囲気下から三元雰囲気下までの
幅広い運転条件下で充分な排ガス浄化特性を有するの
で、自動車などの内燃機関から排出される排気ガス中の
炭化水素（ＨＣ）、一酸化炭素（ＣＯ）及び窒素酸化物
（ＮＯX ）を効率良く浄化することができる。EFFECTS OF THE INVENTION According to the catalyst for purifying exhaust gas of the present invention, it has sufficient exhaust purification characteristics in a lean burn atmosphere after endurance and is sufficient under a wide range of operating conditions from a lean burn atmosphere to a ternary atmosphere. Since it has exhaust gas purification characteristics, it is possible to efficiently purify hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NO x ) in exhaust gas discharged from an internal combustion engine such as an automobile.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/36 １０４ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B01D 53/36 104 A
Claims (4)
ウムからなる群から選ばれた少なくとも１種の貴金属を
含有する活性アルミナを主成分とした第１コート層を設
け、該第１コート層上に貴金属成分を含まない活性アル
ミナを主成分とした無機物から成る第２コート層を設
け、該第２コート層上に金属をイオン交換したゼオライ
ト粉末を主成分とした無機物から成る第３コート層を設
けてなる触媒を触媒コンバーターの上流側に配置し、三
元触媒を前記コンバーターの下流側に配置したことを特
徴とする排ガス浄化用触媒。1. A first coat layer containing activated alumina containing, as a main component, at least one noble metal selected from the group consisting of platinum, palladium and rhodium on a catalyst carrier, and the first coat layer is provided on the first coat layer. A second coating layer made of an inorganic material containing activated alumina as a main component containing no noble metal component is provided, and a third coating layer made of an inorganic material containing ion-exchanged zeolite powder as a main component is provided on the second coating layer. An exhaust gas purifying catalyst characterized in that the resulting catalyst is disposed upstream of the catalytic converter, and the three-way catalyst is disposed downstream of the converter.
ジウムからなる群から選ばれた少なくとも１種の貴金属
を含有する活性アルミナを主成分とした無機物を触媒担
体にコーティングした触媒を用いることを特徴とする請
求項１記載の排ガス浄化用触媒。2. A catalyst in which a catalyst carrier is coated with an inorganic material containing active alumina as a main component and containing at least one noble metal selected from the group consisting of platinum, palladium and rhodium is used as the three-way catalyst. The exhaust gas purifying catalyst according to claim 1.
ナを主成分とした第１コート層を設け、該第１コート層
上に貴金属成分を含まない活性アルミナを主成分とした
無機物から成る第２コート層を設け、該第２コート層上
に金属をイオン交換したゼオライト粉末を主成分とした
無機物から成る第３コート層を設けてなる触媒を触媒コ
ンバーターの上流側に配置し、貴金属成分としてパラジ
ウムのみを含む三元触媒を前記コンバーターの下流側に
配置したことを特徴とする排ガス浄化用触媒。3. A first coating layer comprising platinum-containing active alumina as a main component is provided on a catalyst carrier, and the first coating layer is composed of an inorganic substance containing noble metal component as the main component of active alumina. A catalyst having a second coat layer and a third coat layer made of an inorganic material whose main component is a zeolite powder in which a metal is ion-exchanged is arranged on the upstream side of the catalytic converter to provide a noble metal component. An exhaust gas-purifying catalyst, characterized in that a three-way catalyst containing only palladium is arranged downstream of the converter.
ルトを用いたことを特徴とする請求項１又は３記載の排
ガス浄化用触媒。4. The exhaust gas-purifying catalyst according to claim 1, wherein copper and / or cobalt is used as the ion exchange metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6047069A JPH07256113A (en) | 1994-03-17 | 1994-03-17 | Catalyst for purification of exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6047069A JPH07256113A (en) | 1994-03-17 | 1994-03-17 | Catalyst for purification of exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07256113A true JPH07256113A (en) | 1995-10-09 |
Family
ID=12764881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6047069A Pending JPH07256113A (en) | 1994-03-17 | 1994-03-17 | Catalyst for purification of exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07256113A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7462576B2 (en) | 2003-04-25 | 2008-12-09 | Honda Giken Kogyo Kabushiki Kaisha | Automobile exhaust gas purifying combustion catalysts |
-
1994
- 1994-03-17 JP JP6047069A patent/JPH07256113A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7462576B2 (en) | 2003-04-25 | 2008-12-09 | Honda Giken Kogyo Kabushiki Kaisha | Automobile exhaust gas purifying combustion catalysts |
| DE102004018847B4 (en) | 2003-04-25 | 2023-07-06 | Honda Giken Kogyo K.K. | Automotive exhaust gas purifying combustion catalysts |
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