JP2863567B2 - How exhaust gas purification material and the exhaust gas purifying - Google Patents

How exhaust gas purification material and the exhaust gas purifying

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JP2863567B2
JP2863567B2 JP25856789A JP25856789A JP2863567B2 JP 2863567 B2 JP2863567 B2 JP 2863567B2 JP 25856789 A JP25856789 A JP 25856789A JP 25856789 A JP25856789 A JP 25856789A JP 2863567 B2 JP2863567 B2 JP 2863567B2
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exhaust gas
filter
catalyst
gas purification
purification material
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JPH03118811A (en
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清英 吉田
暁 村松
聡 角屋
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株式会社リケン
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/92Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/78Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/83Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/89Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
    • B01J23/8926Copper and noble metals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28Construction of catalytic reactors
    • F01N3/2882Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00Combinations of different methods of purification
    • F01N2250/02Combinations of different methods of purification filtering and catalytic conversion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2510/00Surface coverings
    • F01N2510/06Surface coverings for exhaust purification, e.g. catalytic reaction
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/20Exhaust after-treatment
    • Y02T10/22Three way catalyst technology, i.e. oxidation or reduction at stoichiometric equivalence ratio

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は排ガス浄化材及びこの排ガス浄化材を使用して排ガスを浄化する方法に係り、更に詳しくは触媒を担持したフィルタからなる排ガス浄化材と、この浄化材を使用してディーゼルエンジン等の排ガスを浄化する方法に関する。 DETAILED DESCRIPTION OF THE INVENTION The present invention [relates] relates to a method of purifying exhaust gas by using the exhaust gas purification material and the exhaust gas purification material, the exhaust gas purifying material more particularly consist of filter carrying a catalyst When, to a method for purifying exhaust gas such as a diesel engine using the purification material.

〔従来の技術及び発明が解決しようとする課題〕 [Challenge BACKGROUND OF INVENTION Problems to be Solved]

近年、ディーゼルエンジンの排気ガス中の微粒子状物質(主として固体状炭素微粒子と液体乃至固体状の高分子量炭化水素微粒子などよりなる)が環境衛生上問題化しいている。 Recently, (consisting mainly to solid carbon particles and liquid or solid high molecular weight hydrocarbon fine particles) particulate matter in the exhaust gas of the diesel engine is correct problems of environmental health. というのは、これらの炭素系微粒子は、平均粒径が0.1〜1μmで、大気中に浮遊しやすいだけでなく、また、呼吸により人体内に取り込まれやすく、また最近の臨床試験結果では、発ガン性物質をも含んでいることが確認されたためである。 Because, these carbon-based fine particles, an average particle diameter of 0.1 to 1 [mu] m, not only easily airborne, and easily taken into the human body by breathing, and in recent clinical test results, issued it is because it was confirmed that also contains a cancerous substance.

これらの微粒子の除去方法としては、大別して以下の2つの方法が検討されている。 As a method for removing these particles, the following two methods are roughly has been studied. その一つは、耐熱フィルタを用いて排ガスを濾過することにより微粒子を捕捉し、これによる圧損失が上昇したらバーナ、電気ヒータ等によって、捕捉した微粒子を燃焼せしめてフィルタを再生する方法である。 One of the particulates captured by filtering the exhaust gas by using a heat-filter, the burner When this pressure loss due to increases, by an electric heater or the like, a method of regenerating the filter burned the captured particulates. こうしたフィルタとしては、金属ワイヤメッシュ、セラミック発泡体、蜂の巣状を呈するセラミックモノリス等が挙げられる。 As such a filter, a metal wire mesh, ceramic foam, ceramic monoliths, and the like exhibiting a honeycomb. 他の一つは、触媒物質を担持させた耐熱フィルタに濾過操作と共に燃焼操作をも行わせて、前記の微粒子燃焼とフィルタ再生の頻度を少なくするとか、再生の必要のない程に上記触媒の燃焼活性を高める方法である。 Other one is also to perform the combustion operation with filtration heat filter supporting a catalyst substance, Toka Less frequent particulate combustion and the filter regeneration of the, of the catalyst to the extent not required for reproduction a method of enhancing the combustion activity.

また、これらの方法において、排ガス中の可燃成分を増加したり、燃料中に炭素酸化促進剤を添加して、微粒子の着火温度を下げる試みもなされている。 Further, in these methods, or to increase the combustible components in the exhaust gas, by the addition of carbon oxidation promoting agent in the fuel, an attempt has been made to lower the ignition temperature of the particulates.

前者の場合、微粒子の除去効果を高めれば高めるほど圧損失上昇が速く、再生頻度も多くなり、再生に高い信頼性が要求され、しかも経済的にも不利になると考えられる。 In the former case, pressure loss increases as the increase if Takamere effect of removing microparticles fast regeneration frequency becomes large, highly reliable reproducing is required, yet it is considered to be disadvantageous economically.

これに対して、後者の方法は、ディーゼルエンジン排気ガスの排出条件(ガス組成及び温度)において触媒活性を維持しうる触媒があればはるかに優れた方法と考えられる。 In contrast, the latter method is considered how much better if the catalyst is capable of maintaining the catalyst activity in the discharge condition of the diesel engine exhaust gas (gas composition and temperature). しかし、ディーゼルエンジンの排気ガス温度はガソリンエンジンの場合と比較して低く、しかも燃料として軽油を用いるために排ガス中にSO 2量も多い。 However, the exhaust gas temperature of the diesel engine is low as compared with the case of a gasoline engine, moreover SO 2 amount common in exhaust gas in order to use diesel as fuel. このような排ガス条件下で蓄積した微粒子を良好に着火燃焼し、しかも二次公害を起こさない再生方法はまだ確立されていない。 Such accumulated particles in exhaust gas conditions and good ignition combustion and yet reproduction method which does not cause secondary pollution has not yet been established.

例えば、卑金属だけを担持した耐熱性フィルタでの微粒子の燃焼反応は通常、約350℃以上の温度で起こる。 For example, the combustion reaction of the fine particles of only a carrying heat resistance filter base metal usually occurs at temperatures above about 350 ° C..
通常運転時の多くは、排ガス温度がそれ以下であり燃焼反応は起こらない微粒子は一旦触媒担持フィルタに捕捉され、やがて温度が上昇したときに燃え出すというプロセスでフィルタが再生される。 Many normal operation, particulate exhaust gas temperature does not occur is less than and combustion reaction is once trapped by the catalyst-carrying filter, the filter is regenerated by a process called eventually out burning when the temperature rises. この場合は、所定の温度に達するまでは圧損失上昇が速く、バーナ、電気ヒータなどによる燃焼再生の頻度が高くなり、実用性に欠ける。 In this case, until it reaches a predetermined temperature faster pressure loss increases, the burner, more frequently, such as by burning regeneration electric heater, it lacks practicality. また、貴金属を添加した触媒を用いた場合は、より低温で微粒子の燃焼反応が起こりやすく、圧損失上昇はゆるやかにはなる。 In the case of using the catalyst added a noble metal, lower temperatures likely to occur combustion reaction of the particulate, pressure loss increase is the gradual. しかし、同時に排ガス中のSO 2の酸化も起こり、このため非常に有害なSO 3や硫酸ミストを生成し、二次公害を生むことになる。 However, at the same time also occur oxidation of SO 2 in the flue gas and thus produces a very harmful SO 3 and sulfuric acid mist, so that produce secondary pollution.

このように、ディーゼルエンジン等の排ガス中の微粒子を効率的に除去する方法は未だ見出されておらず、そのうえ、酸素濃度が2〜20%の広範囲に変化する排ガス中の窒素酸化物の除去は大変困難であり、大きな問題として残されている。 Thus, a method for removing particulates in exhaust gas such as a diesel engine efficiently has not been found yet, moreover, the removal of nitrogen oxides in an exhaust gas oxygen concentration vary widely in 2-20% It has been left as a very difficult, a big problem.

それに対して、特開昭63−242346号において、主としてアルカリ金属と遷移金属を含有する触媒を耐熱フィルタに担持させることによって、排ガス中の炭素系微粒子と窒素酸化物を除去する方法が開示されている。 In contrast, in JP 63-242346, a catalyst mainly containing an alkali metal and transition metal by to be supported on the heat filter and a method for removing carbonaceous particulates and nitrogen oxides in the exhaust gas is disclosed there. しかし、その方法によっても、300℃前後の排ガス温度における窒素酸化物の除去率は20%以下であり、満足できる効果は得られていなかった。 However, by this method, the removal rate of nitrogen oxides in the exhaust gas temperature of about 300 ° C. is 20% or less, the effect satisfactory has not been obtained.

従って本発明の目的は、ディーゼルエンジン等の排出する比較的低温であって酸素濃度変化の大きい排ガス中に含まれる炭素系微粒子を効率的に燃焼除去し、同時に窒素酸化物をも効果的に除去できる排ガス浄化材及び排ガス浄化方法を提供することである。 Accordingly, an object of the present invention, relatively carbon-based particulates low temperatures there are contained in large flue gas oxygen concentration changes efficiently burned off, effectively removing even the nitrogen oxides simultaneously to discharge such as a diesel engine it is possible to provide an exhaust gas purification material and an exhaust gas purification method.

〔課題を解決するための手段〕 [Means for Solving the Problems]

上記課題に鑑み鋭意研究の結果、本発明者は、炭素系微粒子、酸素及び窒素酸化物との触媒の反応を詳細に検討した結果、周期表のIA族(アルカリ金属)、IB族(遷移金属)の中の特定の元素と、希土類金属の中の特定の元素とを同時に含有する触媒を耐熱フィルタに担持させることによって、排ガスの浄化を効率的に行うことができることを発見し、本発明を完成させた。 As a result of intense research in view of the above problems, the present inventors have carbon-based fine particles, the results of the reaction were studied in detail of the catalyst with oxygen and nitrogen oxides, IA of the periodic table (alkali metals), IB group (transition metal ) and the specific elements in the, by supporting the catalyst containing a specific element in the rare earth metal simultaneously in heat filter, discovered that it is possible to perform the purification of the exhaust gas efficiently, the present invention It was completed.

すなわち、本発明の排ガス浄化材は、耐熱フィルタを担体とする排ガス浄化材であって、前記フィルタにはCs That is, the exhaust gas purifying material of the present invention is an exhaust gas purification material for the heat filter and the carrier, the said filter Cs
と、Cuと、Ce及びLaのいずれか1種又は2種が、触媒として担持されていることを特徴とする。 When the Cu, Ce and any one of La or two, characterized in that it is carried as a catalyst.

また本発明の排ガス浄化方法は、Csと、Cuと、Ce及び The exhaust gas purifying method of the present invention, a Cs, and Cu, Ce and
Laのいずれか1種又は2種を、触媒として耐熱フィルタに担持させることによって、排ガス中の炭素系微粒子を酸化すると同時に、炭素系微粒子を還元剤として窒素酸化物を還元して排ガスを浄化することを特徴とする。 Any one or two of La, by carrying heat filter as a catalyst, and at the same time to oxidize the carbon-based particles in exhaust gas to purify the exhaust gas by reducing nitrogen oxides of carbon-based particles as a reducing agent it is characterized in.

また、上記元素に加えて、さらにAgをフィルタに担持させれば、よりいっそうの効果が得られる。 In addition to the above elements, if further loading Ag on the filter, further effect can be obtained.

以下、本発明を詳細に説明する。 The present invention will be described in detail.

本発明で使用する耐熱フィルタは、ディーゼルエンジンの排ガス通路の途中に設置される。 Heat filter used in the present invention is installed in the middle of an exhaust gas passage of a diesel engine. フィルタには触媒が担持され、そのような触媒はCsと、Cuと、Ce及びLaのいずれか1種又は2種を含有するものである。 The filter catalyst is supported, such catalysts are those containing a Cs, and Cu, any one or two of Ce and La.

フィルタ上では排ガス中の炭素系微粒子が触媒元素及び酸素と共存することによって着火温度が下がり、300 Ignition temperature is lowered by carbon-based particles in exhaust gas coexists with the catalytic element and oxygen on the filter, 300
℃以下で燃焼(酸化)される。 ℃ is burned (oxidized) below. また、それと同時に、炭素系微粒子が還元剤として作用して窒素酸化物を還元し、排ガスが効果的に浄化される。 At the same time, the carbon-based particles act as a reducing agent reducing the nitrogen oxides, the exhaust gas is effectively purified. すなわち、Csと、Cu That is, the Cs, Cu
と、Ce及び/又はLaを触媒として用いれば、排ガス中の酸素によって炭素系微粒子が300℃以下で活性化されて窒素酸化物と反応するので、窒素酸化物はN 2に還元され、同時に、炭素系微粒子はCO 2に酸化される。 When, using the Ce and / or La as a catalyst, since the oxygen in the exhaust gas are activated at 300 ° C. or less carbon-based particles react with the nitrogen oxides, nitrogen oxides are reduced to N 2, at the same time, carbon-based fine particles is oxidized to CO 2. 従って3 Therefore 3
00℃以下での排ガスの浄化が常時可能となる。 00 ° C. purifying exhaust gas of the following is possible at all times.

また、触媒としてさらにAgを添加すれば、炭素系微粒子がより低温で着火、燃焼し、窒素酸化物の還元特性も向上する。 Further, if added more Ag as a catalyst, more ignition at low temperature carbon-based particulates, burn, also improved reduction performance of nitrogen oxides.

フィルタに触媒元素を含浸させるには、それらの酢酸塩、炭酸塩、硝酸塩、水酸化物などの溶液にフィルタを浸漬して乾燥するか又は乾燥後、焼成する。 In impregnating the catalyst element to the filter, their acetates, carbonates, nitrates, or following drying to a solution dried by immersing the filter in such a hydroxide, calcined.

耐熱性フィルタは、補集性能及び許容範囲内の圧損失を示すことが必要で、通常担体として用いられるアルミナ、シリカ、チタニア、ジルコニア、アルミナ−チタニア、シリカ−チタニア、シリカ−ジルコニア、チタニア−ジルコニア、ムライト、コージェライト等からなるセラミックファイバー、セラミックフォーム、セラミックモノリス等や、金属ワイヤメッシュ等を挙げることができるが、これらに限定されるものではない。 Heat resistance filter should exhibit a pressure loss in collecting the performance and tolerances, alumina usually used as a carrier, silica, titania, zirconia, alumina - titania, silica - titania, silica - zirconia, titania - zirconia , mullite, or ceramic fibers made of cordierite or the like, ceramic foam, ceramic monoliths, etc., can be exemplified a metal wire mesh or the like, but is not limited thereto.

触媒は耐熱フィルタに直接担持されている必要はなく、上記した多孔質のアルミナ、シリカ、チタニア等の通常用いられている担体を介して耐熱フィルタに間接的に担持されておれば足り、また実用的でもある。 The catalyst need not be carried directly to the heat filter, indirectly only necessary I carried on the heat filter through a usually used carrier alumina, silica, titania, etc. of the porous, also practical there is basis also.

〔実施例〕 〔Example〕

本発明を以下の具体的実施例によりさらに詳細に説明する。 It is described in more detail by the following specific examples of the present invention.

実施例1〜4 市販のディーゼル排ガス用コージェライト(マグネシア、アルミナ及びシリカを主成分とするセラミックス) Examples 1-4 Commercial diesel exhaust for cordierite (ceramics mainly magnesia, alumina and silica)
製ハニカムフィルタ(嵩密度0.37g/cm 3 、空孔率86.0 Manufactured honeycomb filter (bulk density 0.37 g / cm 3, a porosity 86.0
%、容積2.0l)にチタニアを10%(重量%、以下同様) %, 10% titania volume 2.0 l) (% by weight, hereinafter the same)
コートし、これにCsNO 3を含浸して、チタニアに対してC Coated, it was impregnated with CsNO 3, C with respect to the titania
sを2.5%担持させた。 s was 2.5% supported. 次いでCuCl 2とCe(NO 3 ) 3を含浸して、Cuを10%、Ceを2.5%担持させた。 Then impregnated with CuCl 2 and Ce (NO 3) 3, 10 % of Cu, was supported Ce 2.5%. この触媒担持セラミックフィルタは、使用に先立って150℃以下で乾燥し、700℃で3時間焼成した(実施例1)。 The catalyst-carrying ceramic filter prior to use is dried at 0.99 ° C. or less, and calcined 3 hours at 700 ° C. (Example 1). (以後このような排ガス浄化材をCs/Cu/Ceのように表記する。) 実施例1と同様にして、Csを2.5%、Cuを10%、La(L (Hereinafter referred to such an exhaust gas purification material as Cs / Cu / Ce.) In the same manner as in Example 1, the Cs 2.5%, 10% and Cu, La (L
aCl 3塩を使用)を2.5%担持させたCs/Cu/La排ガス浄化材を製造した(実施例2)。 NaCl 3 salt used) were prepared with 2.5% Cs / Cu / La exhaust gas purification material having supported thereon (Example 2).

同様にして、実施例1の浄化材にさらにAg(AgNO 3塩を使用)を0.5%担持させたCs/Cu/Ce/Ag排ガス浄化材(実施例3)、及び実施例2の浄化材にさらにAgを0.5 Similarly, the the purification material further Ag Example 1 (AgNO 3 using salts) the Cs / Cu / Ce / Ag exhaust gas purification material having supported thereon 0.5% (Example 3), and the cleaning material of Example 2 further 0.5 Ag
%担持させたCs/Cu/La/Ag排ガス浄化材(実施例4)を製造した。 % Was supported Cs / Cu / La / Ag exhaust gas purifying material (Example 4) was prepared.

実施例1〜4の排ガス浄化材の各々を、排気量510c Each of the exhaust gas purifying materials of Examples 1 to 4, the exhaust amount 510c
c、単気筒エンジンの排気通路に装着し、炭素系微粒子の着火温度(背圧が低下する温度)とNOx除去率(NOxの c, mounted in an exhaust passage of the single-cylinder engine, ignition temperature (the temperature at which back pressure is reduced) and NOx removal rate of the carbon-based fine particles (of NOx
N 2への転化率)を測定した。 The conversion was measured) to N 2. エンジンは回転数1500rp The engine rotation speed 1500rp
m、負荷90%で運転し、このとき排ガス中の酸素濃度は5%、NOx濃度は約480rpmであった。 m, was operated at a load 90%, the oxygen concentration at this time in the exhaust gas 5% NOx concentration was about 480 rpm.

測定結果を第1表に示す。 The measurement results are shown in Table 1. 本発明の浄化材を用いると、微粒子の着火温度は267℃〜280℃となり、また20% With purification material of the present invention, the ignition temperature of the particulates 267 ° C. to 280 ° C., and the addition of 20%
以上のNOxの除去率が得られた。 Removal rate of more NOx is obtained.

比較例1 比較のために、触媒担持なしのコージェライト製ハニカムフィルタについて、実施例と同じ条件で炭素系微粒子の着火温度とNOx除去率を測定した。 For Comparative Example 1 Comparative, the cordierite honeycomb filter without catalyst carrying it was measured ignition temperatures and NOx removal rate of the carbon-based fine particles under the same conditions as Example. その結果を同じく第1表に示す。 The results are also shown in Table 1. NOxの除去は全く認められなかった。 Removal of NOx was not observed at all.

〔発明の効果〕 以上説明したように、本発明の排ガス浄化材と排ガス浄化方法を用いれば、排ガス中の炭素系微粒子と窒素酸化物との双方が効果的に除去され、比較的低温の排ガスであっても効果的に浄化される。 As has been described [Effect of the Invention, the use of the exhaust gas purification material and the exhaust gas purifying method of the present invention, both the carbon-based fine particles and nitrogen oxides in the exhaust gas is effectively removed, a relatively low temperature of exhaust gas even it is effectively purified.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl. 6 ,DB名) B01D 39/14 B01J 23/78 B01J 23/89 ────────────────────────────────────────────────── ─── of the front page continued (58) investigated the field (Int.Cl. 6, DB name) B01D 39/14 B01J 23/78 B01J 23/89

Claims (4)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】耐熱フィルタを担体とする排ガス浄化材において、前記フィルタにはCsと、Cuと、Ce及びLaのいずれか1種又は2種とが、触媒として担持されていることを特徴とする排ガス浄化材。 The method according to claim 1 heat-resistant filter in an exhaust gas purification material for the carrier, and Cs in the filter, and Cu, and the either one or two of Ce and La, and characterized in that it is carried as a catalyst exhaust gas purification material to.
  2. 【請求項2】請求項1に記載の排ガス浄化材において、 2. A flue gas purification material according to claim 1,
    前記フィルタにはさらにAgが担持されていることを特徴とする排ガス浄化材。 Exhaust gas purifying material characterized by being carried further Ag in the filter.
  3. 【請求項3】耐熱フィルタに担持させた触媒によって排ガス中の炭素系微粒子を酸化すると同時に、前記炭素系微粒子を還元剤として窒素酸化物を還元する排ガス浄化方法において、前記フィルタにはCsと、Cuと、Ce及びLa Wherein simultaneously with the oxidation of carbonaceous particulates in the exhaust gas by catalyst supported on heat-resistant filter, the exhaust gas purification method for reducing nitrogen oxides the carbonaceous particulates as the reducing agent, and Cs in the filter, and Cu, Ce and La
    のいずれか1種又は2種とが触媒として担持されていることを特徴とする排ガス浄化方法。 Exhaust gas purification method, characterized in that the either one or two is carried as a catalyst.
  4. 【請求項4】請求項3に記載の排ガス浄化方法において、前記フィルタにはさらにAgが担持されていることを特徴とする排ガス浄化方法。 4. The exhaust gas purifying method according to claim 3, wherein the exhaust gas purifying method further Ag in the filter is characterized in that it is carried.
JP25856789A 1989-10-03 1989-10-03 How exhaust gas purification material and the exhaust gas purifying Expired - Fee Related JP2863567B2 (en)

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GB9021493A GB2236493B (en) 1989-10-03 1990-10-03 Exhaust gas cleaner
DE19904031385 DE4031385A1 (en) 1989-10-03 1990-10-04 Exhaust gas cleaner and method for cleaning of exhaust gases

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DE4031385A1 (en) 1991-04-11

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