JPH06343830A - Exhaust gas purifying method and catalyst used therefor - Google Patents
Exhaust gas purifying method and catalyst used thereforInfo
- Publication number
- JPH06343830A JPH06343830A JP5137137A JP13713793A JPH06343830A JP H06343830 A JPH06343830 A JP H06343830A JP 5137137 A JP5137137 A JP 5137137A JP 13713793 A JP13713793 A JP 13713793A JP H06343830 A JPH06343830 A JP H06343830A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- nitrogen oxide
- group
- element selected
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
Landscapes
- Treating Waste Gases (AREA)
- 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、自動車等の移動発生
源、硝酸製造工場等の固定発生源から排出される、窒素
酸化物を含んだ排気ガスを浄化する方法及びそのために
利用される触媒に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying exhaust gas containing nitrogen oxides discharged from mobile sources such as automobiles and fixed sources such as nitric acid manufacturing plants, and a catalyst used therefor. It is about.
【０００２】[0002]
【従来の技術】近年、産業の急速な発展に伴って大気汚
染が深刻化してきており早急な対策が望まれている。大
気汚染物質の主なものはPMと呼ばれているすすを主成分
とする微粒子状物質と、窒素酸化物であるが、このうち
PMの対策についてはフィルタートラップや酸化触媒を用
いることで、あるいはエンジンを改良することによって
ある程度の目処がつきつつある。2. Description of the Related Art In recent years, air pollution has become more serious with the rapid development of industry, and immediate countermeasures are desired. The main air pollutants are particulate matter called PM, which is mainly composed of soot, and nitrogen oxides.
As for measures against PM, some prospects are being set by using a filter trap or an oxidation catalyst, or by improving the engine.
【０００３】これに対して、窒素酸化物の対策について
は有効な手段が見つかっておらずさまざまな検討が加え
られているのが現状である。従来、ガソリンエンジン用
の３元触媒にはアルミナ等の担体にPt、Rh、Pdの貴金属
を担持してなるものが用いられてきたが、この触媒はリ
ーン領域、すなわち、燃料に対して空気の多い状態 (従
って酸素の多い状態) では、全く窒素酸化物を除去する
ことができない。そのためジルコニア等の酸素センサー
を用いて、触媒が最もよく働く空燃比の状態になるよう
に制御している。しかしながら、燃費等を考慮するとリ
ーン領域で運転させるのが好ましく、このため酸素過剰
の状態でも働く触媒の開発が待望されている。また、こ
れらの触媒に用いられる貴金属は非常に高価なため、よ
り安く効率的な触媒が待望されている。On the other hand, as a countermeasure against nitrogen oxides, no effective means has been found and various studies are being made at present. Conventionally, a three-way catalyst for a gasoline engine has been used in which a noble metal such as Pt, Rh, and Pd is supported on a carrier such as alumina, but this catalyst is in a lean region, that is, when the air is used for fuel. In the high state (and thus in the high oxygen state), no nitrogen oxides can be removed. Therefore, an oxygen sensor such as zirconia is used to control the air-fuel ratio so that the catalyst works best. However, in consideration of fuel consumption and the like, it is preferable to operate in the lean region, and thus there is a long-awaited development of a catalyst that works even in an excess oxygen state. Further, since noble metals used for these catalysts are very expensive, a cheaper and more efficient catalyst is desired.
【０００４】ディーゼルエンジンにおいては、その燃焼
形態から排気ガス中に大量の酸素が含まれているため同
様の理由で有効な触媒がなく、排気ガス中の窒素酸化物
が問題となっている。これまでエンジン等の改良により
排出量の低減が図られてきたが、今後ますます強化され
る排気ガス規制に対応するためにはどうしても、酸素過
剰下で働く排気ガス浄化用触媒が必要となる。In the diesel engine, since a large amount of oxygen is contained in the exhaust gas due to its combustion mode, there is no effective catalyst for the same reason, and nitrogen oxide in the exhaust gas is a problem. Emissions have been reduced by improving engines, etc., but in order to comply with exhaust gas regulations that will be tightened in the future, it is inevitable that a catalyst for purifying exhaust gas that works in excess of oxygen will be required.
【０００５】このようなリーン側でも働く触媒としては
これまでいくつかが提案されている。たとえば特開平1-
130735号、特開平2-144153号開示の銅含有ゼオライト触
媒が挙げられる。Several catalysts have been proposed so far that work even on the lean side. For example, Japanese Patent Laid-Open No. 1-
130735 and the copper-containing zeolite catalyst disclosed in JP-A-2-144153 can be mentioned.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、この種
の触媒は耐熱性や耐水性に劣ることが指摘されており
(ファインケミカルVol.1 No.7) 実用に耐えうるもので
はない。さらに、触媒が有効に働く温度領域 (ウィンド
ウ) が狭く、自動車のように排気ガス温度が大きく変化
するものに対しては実際的には効果を示すことができな
い。However, it has been pointed out that this type of catalyst is inferior in heat resistance and water resistance.
(Fine Chemical Vol.1 No.7) It is not practical. In addition, the temperature range (window) in which the catalyst effectively works is narrow, and it is practically impossible to show the effect in a vehicle whose exhaust gas temperature greatly changes, such as an automobile.
【０００７】また、ボイラー等の固定発生源に対しては
アンモニアを用いる SCR法が１部で実用化されている
が、装置が高価である上、アンモニアは毒性が高いので
問題が多い。Further, the SCR method using ammonia has been put into practical use in part for a fixed source such as a boiler. However, the apparatus is expensive and ammonia is highly toxic, which causes many problems.
【０００８】本発明は、上記従来技術における問題点を
解消し、酸素過剰下においても有効に働く、しかも安価
で効率的な排気ガス浄化方法及びそれに用いられる触媒
を提供することを目的とする。An object of the present invention is to solve the above-mentioned problems in the prior art and to provide an inexpensive and efficient exhaust gas purification method that works effectively even in the presence of excess oxygen and a catalyst used therefor.
【０００９】[0009]
【課題を解決するための手段】本発明者等はCu含有ゼオ
ライト触媒の欠点を解消し、耐水性、耐熱性に優れ、幅
広い温度域にわたって効率的に排気ガス、とくに窒素酸
化物を浄化できる触媒を開発すべく鋭意検討した結果、
酸素過剰下においても有効に働く、しかも安価で効率的
な排気ガス浄化方法及びそれに用いられる触媒を見出し
た。The present inventors have solved the drawbacks of Cu-containing zeolite catalysts, have excellent water resistance and heat resistance, and can efficiently purify exhaust gas, particularly nitrogen oxides, over a wide temperature range. As a result of diligent study to develop
The inventors have found an inexpensive and efficient exhaust gas purification method that works effectively even in the presence of excess oxygen, and a catalyst used therefor.
【００１０】即ち本発明は、一酸化炭素及び／又は炭素
数１〜24の炭化水素の中から選ばれる１種以上の炭化水
素の存在下、窒素酸化物を含む排気ガスを、触媒成分と
して(a)Cu、 (b)Fe及び (c)周期表３Ｂ族に属する元素
又はSi、Ge、Sn、Pbから選ばれる少なくとも１種の元
素、を少なくとも含有する触媒に接触させて窒素酸化物
を除去することを特徴とする排気ガス浄化方法に関す
る。また本発明は、 (a)Cu、 (b)Fe及び (c)周期表３Ｂ
族に属する元素又はSi、Ge、Sn、Pbから選ばれる少なく
とも１種の元素、を少なくとも含有する触媒成分が、
(i)メタル担体、(ii)Al、Si、Ti、Zr、Mg、Feの酸化物
及び水酸化物、 (iii)ゼオライト及び(iv)シリカ−アル
ミナからなる群から選ばれる少なくとも１種の担体に担
持されてなることを特徴とする排気ガス浄化用触媒に関
する。That is, according to the present invention, exhaust gas containing nitrogen oxide is used as a catalyst component in the presence of carbon monoxide and / or one or more kinds of hydrocarbons selected from hydrocarbons having 1 to 24 carbon atoms. Nitrogen oxides are removed by contacting with a catalyst containing at least a) Cu, (b) Fe, and (c) an element belonging to Group 3B of the periodic table or at least one element selected from Si, Ge, Sn, and Pb. And an exhaust gas purification method. The present invention also provides (a) Cu, (b) Fe and (c) Periodic Table 3B.
A catalyst component containing at least an element belonging to the group or at least one element selected from Si, Ge, Sn, and Pb,
(i) Metal carrier, (ii) Al, Si, Ti, Zr, Mg, Fe oxides and hydroxides, (iii) Zeolites and (iv) At least one carrier selected from the group consisting of silica-alumina The present invention relates to an exhaust gas purifying catalyst, which is carried by
【００１１】本発明において用いられる触媒は、たとえ
ば水溶性銅塩、水溶性鉄塩及び周期表３Ｂ族に属する元
素又はSi、Ge、Sn、Pbから選ばれる少なくとも１種の元
素の水溶性塩の水溶液から生成させたCu、Fe及び周期表
３Ｂ族に属する元素又はSi、Ge、Sn、Pbから選ばれる少
なくとも１種の元素の化合物の沈澱物を焼成したものを
触媒成分とするものであり、必要に応じて更にアルカリ
金属やアルカリ土類金属類の元素を含有させても良い。The catalyst used in the present invention is, for example, a water-soluble copper salt, a water-soluble iron salt and a water-soluble salt of an element belonging to Group 3B of the periodic table or at least one element selected from Si, Ge, Sn and Pb. The catalyst component is obtained by calcining a precipitate of Cu, Fe and an element belonging to Group 3B of the periodic table or a compound of at least one element selected from Si, Ge, Sn and Pb, which is produced from an aqueous solution, If necessary, an element such as an alkali metal or an alkaline earth metal may be further contained.
【００１２】本発明の触媒は、触媒成分の主成分たる
(a)Cu、 (b)Fe及び (c)周期表３Ｂ族に属する元素又はS
i、Ge、Sn、Pbから選ばれる少なくとも１種の元素が原
子比で(a)：(b)：(c) ＝１： 0.1〜2.5 ： 0.1〜10の範
囲にあることが好ましい。これらの範囲外にあると得ら
れる触媒の活性が低下し、温度ウィンドウも狭くなる。The catalyst of the present invention is the main component of the catalyst component.
(a) Cu, (b) Fe and (c) Periodic Table 3B group element or S
It is preferable that the atomic ratio of at least one element selected from i, Ge, Sn, and Pb is (a) :( b) :( c) = 1: 0.1 to 2.5: 0.1 to 10. If it is out of these ranges, the activity of the obtained catalyst is lowered and the temperature window is narrowed.
【００１３】本発明において触媒は、その触媒活性成分
としてCu、Fe及び周期表３Ｂ族に属する元素又はSi、G
e、Sn、Pbから選ばれる少なくとも１種の元素を含有す
る必要があり、これによりNOX 浄化触媒として従来知ら
れていたCu−Al触媒、Cu−Fe触媒やCu含有ゼオライト触
媒にない特性を有するようになる。In the present invention, the catalyst comprises Cu, Fe and an element belonging to Group 3B of the periodic table, Si or G as its catalytically active component.
It is necessary to contain at least one element selected from e, Sn, and Pb, which makes it possible to obtain characteristics not found in Cu-Al catalysts, Cu-Fe catalysts, and Cu-containing zeolite catalysts that are conventionally known as NO X purification catalysts. To have.
【００１４】該触媒活性成分は、種々の担体に担持でき
るが、メタル担体、Al、Si、Ti、Zr、Mg、Feの酸化物及
び水酸化物、ゼオライト、シリカ−アルミナの群から選
ばれる担体が好ましく、さらに好ましくは、メタル担
体、アルミナ、シリカ、ゼオライト、シリカ−アルミナ
等の多孔質担体であり、最も好ましくはメタル担体、コ
ージェライト、アルミナである。The catalytically active component can be carried on various carriers, but is selected from the group consisting of metal carriers, oxides and hydroxides of Al, Si, Ti, Zr, Mg, Fe, zeolites, and silica-alumina. Are preferred, and more preferred are porous carriers such as metal carriers, alumina, silica, zeolite, and silica-alumina, and most preferred are metal carriers, cordierite, and alumina.
【００１５】本発明でいうメタル担体とは耐熱性ステン
レス鋼、Al−Cr−Fe合金等で形成されるハニカムなどの
モノリス型担体を指す。The metal carrier referred to in the present invention means a monolith type carrier such as a honeycomb formed of heat resistant stainless steel, Al-Cr-Fe alloy or the like.
【００１６】上記担体への触媒成分の担持量は、担体１
リットルに対して 0.1〜50ｇの範囲が好ましい。 0.1ｇ
より少ないと効果がはっきりせず、50ｇを超えると添加
量の割には効果が増大せず、コストが高くなるだけであ
る。The amount of the catalyst component loaded on the carrier is the carrier 1.
The range of 0.1 to 50 g per liter is preferred. 0.1 g
If it is less than 50 g, the effect is not clear, and if it exceeds 50 g, the effect does not increase for the amount added, and the cost only increases.
【００１７】また、上記担体に触媒成分を担持する方法
としては、たとえば水溶性銅塩、水溶性鉄塩及び周期表
３Ｂ族に属する元素又はSi、Ge、Sn、Pbから選ばれる少
なくとも１種の元素の水溶性塩の水溶液にアルミナ等の
多孔質担体を浸漬し、Cu、Fe及び周期表３Ｂ族に属する
元素又はSi、Ge、Sn、Pbから選ばれる少なくとも１種の
元素の化合物の沈澱物を担体表面に析出させ、ついで乾
燥、焼成する方法をとることができる。As a method of supporting the catalyst component on the carrier, for example, a water-soluble copper salt, a water-soluble iron salt, and at least one element selected from the elements belonging to Group 3B of the periodic table or Si, Ge, Sn, or Pb. A porous carrier such as alumina is immersed in an aqueous solution of a water-soluble salt of an element, and a precipitate of Cu, Fe and an element belonging to Group 3B of the periodic table or a compound of at least one element selected from Si, Ge, Sn and Pb Can be deposited on the surface of the carrier, followed by drying and firing.
【００１８】本発明の排気ガス浄化方法においては、還
元剤を併用することが重要である。還元剤としては排気
ガス中に含まれる一酸化炭素や未燃の炭化水素を用いる
ことができるが、必要に応じて外部より炭化水素を添加
しても良い。この時用いられる炭化水素としては、メタ
ン、エタン、プロパン、エチレン、プロピレン、ガソリ
ン、軽油等が挙げられるが、ガソリン、軽油などの燃料
の一部を使う形にするのが好ましい。In the exhaust gas purification method of the present invention, it is important to use a reducing agent together. Although carbon monoxide or unburned hydrocarbon contained in the exhaust gas can be used as the reducing agent, hydrocarbon may be added from the outside if necessary. Examples of the hydrocarbon used at this time include methane, ethane, propane, ethylene, propylene, gasoline, light oil and the like, but it is preferable to use a part of fuel such as gasoline and light oil.
【００１９】上記還元剤の使用量としては、排気ガスに
対して 100〜5000ppm (CH4換算値)が好ましい。100ppm
以下では触媒の能力が十分発揮されず、 5000ppm以上で
は経済的でなくなると共に残存還元剤が問題になってく
る。The amount of the reducing agent used is preferably 100 to 5000 ppm (CH 4 conversion value) with respect to the exhaust gas. 100ppm
If the amount is less than 5000ppm, it will not be economical and the residual reducing agent will become a problem.
【００２０】本発明の使用温度としては、 150〜1000℃
の範囲が好ましく、さらに好ましくは 200〜800 ℃であ
る。The working temperature of the present invention is 150 to 1000 ° C.
Is preferable, and more preferably 200 to 800 ° C.
【００２１】空間速度(SV)に関しては、一般的には空間
速度が大きくなると触媒の能力の低下が起こるが、本発
明の触媒においては、50,000hr-1以上でも十分に使用が
可能である。Regarding the space velocity (SV), generally, as the space velocity increases, the ability of the catalyst decreases, but the catalyst of the present invention can be sufficiently used even at 50,000 hr -1 or more.
【００２２】なお、本発明は自動車等の移動発生源だけ
でなく、硝酸製造工場等の固定発生源から排出される、
窒素酸化物を含んだ排気ガスを浄化するのに対しても利
用することができる。The present invention is not limited to moving sources such as automobiles, but is also discharged from fixed sources such as nitric acid manufacturing plants.
It can also be used to purify exhaust gas containing nitrogen oxides.
【００２３】[0023]
【実施例】以下、具体的な実施例をあげて説明するが、
本発明はこれらの実施例によってなんら限定されるもの
ではない。[Examples] Hereinafter, specific examples will be described.
The invention is in no way limited by these examples.
【００２４】実施例１ アルミナがウォッシュコートされた１in2 当たり 400セ
ルの0.65リットルのコージェライト製担体を、水500gに
Cu(NO3)2・6H2O 60g、Fe(NO3)2・6H2O 58g、Ga(NO3)3・
6H2O 36.4gを溶解させた溶液に浸漬し、ついで14重量％
NH4OH 溶液 (必要量) を徐々に滴下した。この溶液から
担体を取り出し、乾燥終了後 750℃で１時間空気中で焼
成することで所望のハニカム状触媒を得た。[0024] 0.65 liters of cordierite carrier of Example 1 alumina 1in 2 per 400 cells which are washcoated, water 500g
Cu (NO 3 ) 2・ 6H 2 O 60g, Fe (NO 3 ) 2・ 6H 2 O 58g, Ga (NO 3 ) 3・
Immerse in a solution of 6H 2 O 36.4g, then 14% by weight
NH 4 OH solution (required amount) was gradually added dropwise. The carrier was taken out of this solution, and after drying, it was calcined in air at 750 ° C. for 1 hour to obtain a desired honeycomb catalyst.
【００２５】実施例２ 実施例１において、Ga(NO3)3・6H2Oの代わりにH3BO3 1
2.4g を使う以外は同様にして所望のハニカム状触媒を
得た。Example 2 In Example 1, H 3 BO 3 1 was used instead of Ga (NO 3 ) 3 .6H 2 O.
A desired honeycomb catalyst was obtained in the same manner except that 2.4 g was used.
【００２６】比較例１ 酢酸銅溶液を用いてCuイオン交換したゼオライトを得、
これとアルミナゾル、シリカゾルを混合したスラリー
を、実施例１で用いたコージェライト製担体にウォッシ
ュコートすることで、比較用の銅イオン交換ゼオライト
触媒を得た。Comparative Example 1 A Cu ion-exchanged zeolite was obtained using a copper acetate solution,
A slurry prepared by mixing this with alumina sol and silica sol was wash-coated on the cordierite carrier used in Example 1 to obtain a copper ion-exchanged zeolite catalyst for comparison.
【００２７】比較例２ 実施例１において、Ga(NO3)3・6H2Oを使わない以外は同
様にして所望のハニカム状触媒を得た。Comparative Example 2 A desired honeycomb catalyst was obtained in the same manner as in Example 1, except that Ga (NO 3 ) 3 .6H 2 O was not used.
【００２８】(試験例１)上記のような方法にて調製し
た、本発明の触媒を 1.6リットルのガソリンエンジンの
排気系に装着し、触媒層入口温度を変化させてNOの浄化
試験を行った。SV値は80,000hr-1、空燃比A/F は18とし
た。比較例１で得られた銅イオン交換ゼオライト触媒と
比較例２で得られたCu−Fe系触媒も同様に試験を行い結
果を表１にまとめて示したが、これからも明らかなよう
に、本発明の触媒及び方法によれば、酸素過剰下におい
ても低温から極めて高い窒素酸化物の浄化率が得られ、
しかも炭化水素はほぼ完全に酸化される。(Test Example 1) The catalyst of the present invention prepared by the above-mentioned method was mounted on the exhaust system of a 1.6-liter gasoline engine, and a NO purification test was conducted by changing the catalyst layer inlet temperature. . The SV value was 80,000 hr -1 , and the air-fuel ratio A / F was 18. The copper ion-exchanged zeolite catalyst obtained in Comparative Example 1 and the Cu-Fe-based catalyst obtained in Comparative Example 2 were also tested in the same manner, and the results are summarized in Table 1. According to the catalyst and method of the invention, an extremely high purification rate of nitrogen oxides can be obtained from a low temperature even in the presence of excess oxygen,
Moreover, hydrocarbons are almost completely oxidized.
【００２９】[0029]
【表１】 [Table 1]
【００３０】(試験例２)上記のような方法にて調製し
た、本発明の触媒を 1.6リットルのガソリンエンジンの
排気系に装着し、SV＝80,000hr-1、触媒層入口温度 400
℃の条件下、A/Fを変化させてNO、HC、CO浄化率を測定
した。また、特開平4-334548号公報記載の実施例１の方
法に準じて三元触媒を作成し、同条件下で比較品として
評価した。結果を表２に示したが、これからも明らかな
ように、本発明の触媒を使えば、３元ガスすべてが80重
量％以上で浄化されるウィンドウが従来品に比べてはる
かに広くなっており、空燃比の制御が簡単にすむだけで
なく、安価に排ガスを浄化できる。(Test Example 2) The catalyst of the present invention prepared by the above-mentioned method was installed in the exhaust system of a 1.6-liter gasoline engine, SV = 80,000 hr −1 , catalyst layer inlet temperature 400
Under conditions of ° C, A / F was changed and NO, HC, and CO purification rates were measured. A three-way catalyst was prepared according to the method of Example 1 described in JP-A-4-334548 and evaluated as a comparative product under the same conditions. The results are shown in Table 2, and as is clear from this, the use of the catalyst of the present invention makes the window for purifying all of the three-way gas at 80% by weight or more much wider than that of the conventional product. Not only can the air-fuel ratio be easily controlled, but the exhaust gas can be purified at low cost.
【００３１】[0031]
【表２】 [Table 2]
【００３２】[0032]
【発明の効果】本発明によれば、酸素過剰下においても
効率的に排気ガス中の窒素酸化物を浄化することができ
る。本発明の触媒は、従来の銅含有ゼオライト触媒より
も耐水性、耐熱性等に優れ、しかも幅広い温度ウィンド
ウを有するため、リーンバーン用やディーゼルエンジン
用だけでなく現行の三元触媒の代替品としても使用する
ことができる。なお、本発明の触媒はCu、Fe及び周期表
３Ｂ族に属する元素又はSi、Ge、Sn、Pbから選ばれる少
なくとも１種の元素といった非常にポピュラーな金属を
用いて作られるために、三元触媒よりもはるかに安価に
製造できる。According to the present invention, nitrogen oxides in exhaust gas can be efficiently purified even in the presence of excess oxygen. The catalyst of the present invention is superior in water resistance, heat resistance, etc. to conventional copper-containing zeolite catalysts and has a wide temperature window, so that it can be used not only for lean burn and diesel engines but also as an alternative to the current three-way catalyst. Can also be used. Since the catalyst of the present invention is made of a very popular metal such as Cu, Fe and an element belonging to Group 3B of the periodic table or at least one element selected from Si, Ge, Sn and Pb, the ternary It is much cheaper to manufacture than a catalyst.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｊ 23/74 ３０１ Ａ 8017−4Ｇ 23/82 ＺＡＢ Ａ 8017−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location B01J 23/74 301 A 8017-4G 23/82 ZAB A 8017-4G
Claims (4)
化水素の中から選ばれる１種以上の炭化水素の存在下、
窒素酸化物を含む排気ガスを、触媒成分として (a)Cu、
(b)Fe及び (c)周期表３Ｂ族に属する元素又はSi、Ge、
Sn、Pbから選ばれる少なくとも１種の元素、を少なくと
も含有する触媒に接触させて窒素酸化物を除去すること
を特徴とする排気ガス浄化方法。1. In the presence of one or more hydrocarbons selected from carbon monoxide and / or hydrocarbons having 1 to 24 carbon atoms,
Exhaust gas containing nitrogen oxides, as a catalyst component (a) Cu,
(b) Fe and (c) elements belonging to Group 3B of the Periodic Table or Si, Ge,
An exhaust gas purification method comprising contacting a catalyst containing at least one element selected from Sn and Pb to remove nitrogen oxides.
／又は、メタン、エタン、プロパン、エチレン、プロピ
レン、ガソリン、軽油の中から選ばれる１種類以上であ
ることを特徴とする請求項１記載の排気ガス浄化方法。2. The hydrocarbon is at least one selected from unburned substances in exhaust gas components and / or methane, ethane, propane, ethylene, propylene, gasoline and light oil. The exhaust gas purification method described in 1.
属する元素又はSi、Ge、Sn、Pbから選ばれる少なくとも
１種の元素、を少なくとも含有する触媒成分を含有する
ことを特徴とする排気ガス浄化用触媒。3. A catalyst component containing at least (a) Cu, (b) Fe and (c) an element belonging to Group 3B of the periodic table or at least one element selected from Si, Ge, Sn and Pb. An exhaust gas purifying catalyst characterized by:
Si、Ti、Zr、Mg、Feの酸化物及び水酸化物、 (iii)ゼオ
ライト及び(iv)シリカ−アルミナからなる群から選ばれ
る少なくとも１種の担体に担持されてなることを特徴と
する請求項３記載の排気ガス浄化用触媒。4. The catalyst component comprises (i) a metal carrier, (ii) Al,
Claims characterized by being carried on at least one carrier selected from the group consisting of oxides and hydroxides of Si, Ti, Zr, Mg, Fe, (iii) zeolite and (iv) silica-alumina. Item 3. An exhaust gas purifying catalyst according to item 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5137137A JPH06343830A (en) | 1993-06-08 | 1993-06-08 | Exhaust gas purifying method and catalyst used therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5137137A JPH06343830A (en) | 1993-06-08 | 1993-06-08 | Exhaust gas purifying method and catalyst used therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06343830A true JPH06343830A (en) | 1994-12-20 |
Family
ID=15191690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5137137A Pending JPH06343830A (en) | 1993-06-08 | 1993-06-08 | Exhaust gas purifying method and catalyst used therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06343830A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100859747B1 (en) * | 2007-02-05 | 2008-09-24 | 고등기술연구원연구조합 | METHOD AND DEVICE FOR REDUCING THE NOx AND N2O OF GASES |
-
1993
- 1993-06-08 JP JP5137137A patent/JPH06343830A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100859747B1 (en) * | 2007-02-05 | 2008-09-24 | 고등기술연구원연구조합 | METHOD AND DEVICE FOR REDUCING THE NOx AND N2O OF GASES |
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