JPH08103636A - Low-temperature denitrator - Google Patents
Low-temperature denitratorInfo
- Publication number
- JPH08103636A JPH08103636A JP6242935A JP24293594A JPH08103636A JP H08103636 A JPH08103636 A JP H08103636A JP 6242935 A JP6242935 A JP 6242935A JP 24293594 A JP24293594 A JP 24293594A JP H08103636 A JPH08103636 A JP H08103636A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- denitration
- low
- temperature
- exhaust gas
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、選択的接触還元法によ
る排煙脱硝装置に係わり、特に低温域で排ガス中の窒素
酸化物を除去する脱硝装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas denitration device by a selective catalytic reduction method, and more particularly to a denitration device for removing nitrogen oxides in exhaust gas in a low temperature range.
【０００２】[0002]
【従来の技術】発電所、各種工場、自動車などから排出
される排煙中のＮＯｘは、光化学スモッグの原因物質で
あり、その効果的な除去方法として、アンモニア（ＮＨ
3）を還元剤とした選択的接触還元による排煙脱硝法が
火力発電所を中心に幅広く用いられている。2. Description of the Related Art NOx in smoke emitted from power plants, various factories, automobiles, etc. is a causative substance of photochemical smog, and ammonia (NH
Flue gas denitration method by selective catalytic reduction using 3 ) as a reducing agent is widely used mainly in thermal power plants.
【０００３】他方、都市ゴミ焼却設備についても、人口
の増加、埋め立て用地の減少あるいは埋め立てコストの
増加等の諸事情から今後更にこうしたプラントの増加が
見込まれており、特に都市部近郊に設置される為、上記
火力発電所と同様に十分な排煙処理が要求されることか
ら、排煙脱硝装置が必要となってきている。On the other hand, as for the municipal waste incineration facility, such an increase in the number of plants is expected in the future due to various factors such as an increase in the population, a decrease in the landfill site, or an increase in the landfill cost. Especially, the plant will be installed near the urban area. For this reason, a sufficient flue gas treatment is required as in the case of the above-mentioned thermal power plant, so that a flue gas denitration device is required.
【０００４】都市ゴミ焼却設備では、季節により処理す
るゴミの性状が異なり、その排ガス量あるいは排ガス含
有水分量が大きく変化する。加えて、焼却設備から排出
される硫黄酸化物（ＳＯｘ）、塩化水素（ＨＣＩ）及び
ダイオキシン（ＤＸＮ）等の有害ガスを効果的に除去す
るため、図２に示す様にバグフィルタ６を脱硝装置８の
前流側に配置するシステムが一般的であり、これらの有
害物質の除去性能からあるいはバグフィルタ６の焼損防
止の観点から、バグフィルタ６の運転温度は１５０°Ｃ
〜２００°Ｃで制御されるため、脱硝装置８は排ガス再
加熱器７で再加熱を行った後でさえ２００°Ｃ〜２３０
°Ｃ近辺で運転しなければならない。こうしたプラント
に脱硝装置８を設置する場合には、低温域で脱硝性能が
高い触媒を使用することが望まれる。In the municipal waste incineration facility, the nature of the waste to be treated changes depending on the season, and the amount of exhaust gas or the amount of water contained in exhaust gas greatly changes. In addition, in order to effectively remove harmful gases such as sulfur oxides (SOx), hydrogen chloride (HCI) and dioxin (DXN) discharged from the incineration facility, the bag filter 6 has a denitration device as shown in FIG. The system arranged on the upstream side of 8 is generally used, and the operating temperature of the bag filter 6 is 150 ° C. from the viewpoint of the removal performance of these harmful substances or from the viewpoint of preventing the bag filter 6 from burning.
Since the temperature is controlled at ˜200 ° C., the denitration device 8 is kept at 200 ° C. to 230 ° C. even after reheating with the exhaust gas reheater 7.
You must drive near ° C. When the denitration device 8 is installed in such a plant, it is desired to use a catalyst having high denitration performance in a low temperature range.
【０００５】しかしながら、脱硝触媒は一般的に図４に
示す様に反応温度が低くなるにつれ、その性能が低下す
るため、要求される脱硝装置８の性能を満足するために
は、充填する触媒量を多くしなければならないという問
題があった。However, the performance of the denitration catalyst generally decreases as the reaction temperature becomes lower as shown in FIG. 4. Therefore, in order to satisfy the required performance of the denitration device 8, the amount of the catalyst to be charged must be increased. There was a problem that I had to increase.
【０００６】[0006]
【発明が解決しようとする課題】上記従来技術は、１８
０〜２５０°Ｃの比較的低温域に設置される脱硝装置に
対して、少ない触媒量で効率良く窒素酸化物を除去する
という点に於いて十分な配慮がされておらず、脱硝装置
が大型化する及び／または、触媒層の圧力損失が高くな
り、脱硝装置後流の誘引通風機として大容量のものが必
要となるという問題点があった。SUMMARY OF THE INVENTION The above-mentioned prior art is 18
For denitration equipment installed in a relatively low temperature range of 0 to 250 ° C, sufficient consideration has not been given to the efficient removal of nitrogen oxides with a small amount of catalyst, resulting in a large denitration equipment. And / or the pressure loss of the catalyst layer becomes high, and there is a problem in that a large-capacity induced draft fan downstream of the denitration device is required.
【０００７】本発明の目的は、上記した従来技術の欠点
をなくし、より少ない触媒で効率よく窒素酸化物を除去
する脱硝装置を提供することである。An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a denitration apparatus for efficiently removing nitrogen oxides with less catalyst.
【０００８】[0008]
【課題を解決するための手段】上記目的は、比較的低温
域（１８０〜２５０°Ｃ）にて脱硝するものにおいて、
脱硝触媒の前流側に排ガス中の一酸化窒素（ＮＯ）を二
酸化窒素（ＮＯ2）に酸化するＮＯ酸化触媒を設置する
こと、または、一酸化窒素を二酸化窒素に酸化する機能
を併せもつ脱硝触媒を設置することによって達成され
る。[Means for Solving the Problems] The above object is to denitrate in a relatively low temperature range (180 to 250 ° C.),
An NO oxidation catalyst that oxidizes nitric oxide (NO) in exhaust gas to nitrogen dioxide (NO 2 ) is installed on the upstream side of the denitration catalyst, or denitration that also has the function of oxidizing nitric oxide to nitrogen dioxide This is achieved by installing a catalyst.
【０００９】[0009]
【作用】上記の様に、都市ゴミ焼却設備などに脱硝装置
を設置する場合には、バグフィルタあるいは電気集塵機
出口の比較的低温（２００〜２５０°Ｃ）に於いて、よ
り効果的に排ガス中の窒素酸化物を除去する、活性の高
い触媒が望まれる。As described above, when the denitration device is installed in the municipal waste incineration facility, etc., it is more effective in the exhaust gas at a relatively low temperature (200 to 250 ° C) at the outlet of the bag filter or the electrostatic precipitator. A highly active catalyst that removes nitrogen oxides is desired.
【００１０】都市ゴミ焼却設備に設置する脱硝触媒とし
ては、酸化チタン系の触媒に低温活性の高い五酸化バナ
ジウム（Ｖ2Ｏ5）等をはじめとする各種成分を添加した
もの、あるいは、金属イオン（例えば銅）で置換された
ゼオライト系の触媒が一般的に用いられている。The denitration catalyst to be installed in the municipal refuse incineration facility is a titanium oxide type catalyst to which various components such as vanadium pentoxide (V 2 O 5 ) having high low temperature activity are added, or a metal ion. Zeolite-based catalysts substituted with (eg, copper) are commonly used.
【００１１】酸化チタン系触媒に活性成分を添加した触
媒を使用する場合には、活性成分の量やその製造法を適
正化するだけでは低温域での活性向上には限度がある。
他方、ゼオライト系触媒を使用する場合には、極めて高
い脱硝性能を有するものの、脱硝装置部に流入してくる
排ガス中の硫黄酸化物（ＳＯｘ）により短期間で著しく
性能が低下するため実用化には適さない。When a catalyst prepared by adding an active ingredient to a titanium oxide type catalyst is used, there is a limit to improving the activity in a low temperature range only by optimizing the amount of the active ingredient and the production method thereof.
On the other hand, when a zeolite-based catalyst is used, it has extremely high denitrification performance, but the performance will be significantly reduced in a short period of time due to the sulfur oxides (SOx) in the exhaust gas flowing into the denitrification equipment, making it suitable for practical use. Is not suitable.
【００１２】脱硝反応は図５に示すように、排ガス中の
ＮＯ：ＮＯ2が１：１の時、最もその速度が速く、即ち
ＮＯｘ除去性能が高くなる。したがって、低温での脱硝
活性に加え、ＮＯとＮＯ2の存在割合を制御することが
できれば脱硝性能の向上が期待できる。As shown in FIG. 5, when the NO: NO 2 in the exhaust gas is 1: 1, the denitration reaction has the highest speed, that is, the NOx removal performance is high. Therefore, if the presence ratio of NO and NO 2 can be controlled in addition to the denitration activity at low temperature, improvement of denitration performance can be expected.
【００１３】一般に、焼却炉より都市ゴミの焼却により
生成するＮＯｘの９０〜９５％は一酸化窒素（ＮＯ）で
ある。ここで、ＮＯからＮＯ2への転化は、通常の化学
反応（酸化反応）とは異なり低温ほどその速度が速くな
る反応であるから低温域に設置される脱硝装置にとって
はむしろ好都合ではあるが、例えば都市ゴミ焼却システ
ム（図２）で最も低温度ゾーンとなるバクフィルタ部で
の温度１５０°Ｃに於いてでさえＮＯ濃度１０００ｐｐ
ｍ，０2濃度３％でＮＯの１０％がＮＯ2に酸化されるの
には約２０分要し、実システムに於いては、生成したＮ
Ｏはほとんどそのままの状態で脱硝装置に流入すること
となる。Generally, 90 to 95% of NOx produced by incineration of municipal waste from an incinerator is nitric oxide (NO). Here, the conversion of NO to NO 2 is a reaction in which, unlike a normal chemical reaction (oxidation reaction), the rate increases at lower temperatures, so it is rather convenient for a denitration device installed in a low temperature region. For example, the NO concentration is 1000 pp even at a temperature of 150 ° C in the tap filter, which is the lowest temperature zone in the municipal waste incineration system (Fig. 2).
It took about 20 minutes for 10% of NO to be oxidized to NO 2 at a concentration of 3% m, 0 2 , and in the actual system, the generated N
O will flow into the denitration device in almost the same state.
【００１４】本発明は、こうした状況に臨みてなされた
ものである。The present invention has been made in view of such a situation.
【００１５】本発明によれば、化学平衡的に酸化側に片
寄った低温域でも、酸化されにくいＮＯをＮＯ2に酸化
するための触媒を脱硝触媒の前流側に設置しているの
で、ＮＯの適正量をＮＯ2に酸化させ引き続いて生成し
たＮＯ2とＮＯが脱硝触媒上で効率よく反応する。故
に、必要な除去性能を満足するための触媒量は少なくて
良い。According to the present invention, the catalyst for oxidizing NO, which is hard to be oxidized, to NO 2 is installed on the upstream side of the denitration catalyst even in a low temperature range which is deviated to the oxidation side in a chemical equilibrium. The appropriate amount of NO 2 is oxidized to NO 2 , and subsequently NO 2 and NO produced efficiently react on the denitration catalyst. Therefore, the amount of catalyst required to satisfy the required removal performance may be small.
【００１６】なお、本発明に於いてＮＯをＮＯ2に酸化
する触媒としては、図６に示す様に、Ｔｉ−Ｍｎ，Ｔｉ
−Ｐｔ，Ｔｉ−Ｃｏ，Ｔｉ−Ｃｒ系等が挙げられる。As a catalyst for oxidizing NO to NO 2 in the present invention, as shown in FIG. 6, Ti--Mn, Ti
-Pt, Ti-Co, Ti-Cr system etc. are mentioned.
【００１７】酸化生成物であるＮＯ2は、図７に示すよ
うにＮＨ3共存下で排ガス温度か１８０°Ｃ以下の低温
では、ＮＨ3と気相で反応し硝酸アンモニウム（ＮＨ4Ｎ
Ｏ3）を生じる。As shown in FIG. 7, NO 2 which is an oxidation product reacts with NH 3 in the gas phase in the presence of NH 3 at the exhaust gas temperature or at a low temperature of 180 ° C. or lower to react with ammonium nitrate (NH 4 N
Produces O 3 ).
【００１８】ＮＨ3＋ＨＮＯ3＝ＮＨ4ＮＯ3 また、脱硝触媒が存在する場合にもほぼ同様な温度で硝
酸アンモニウムを生じ、長期間の低温運用に於いてはこ
の硝酸アンモニウムが触媒の有効な細孔を閉塞するため
脱硝性能の低下を招き好ましくない。NH 3 + HNO 3 = NH 4 NO 3 Further , ammonium nitrate is produced at almost the same temperature in the presence of a denitration catalyst, and in long-term low temperature operation, this ammonium nitrate forms effective pores of the catalyst. This is not preferable because it causes blockage of denitration performance.
【００１９】[0019]
【実施例】以下に本発明の実施例を図面を用いて説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００２０】第１図は、本発明にもとずくバグフィルタ
後流の低温域に脱硝装置を適用した場合のシステムを示
す。FIG. 1 shows a system in which a denitration device is applied to a low temperature region downstream of a bag filter according to the present invention.
【００２１】都市ゴミは焼却炉１で焼却される。都市ゴ
ミの焼却に伴い窒素酸化物（ＮＯｘ）が生成するので焼
却炉１内にアンモニア、アンモニア水あるいは尿素水等
の還元剤を注入して高温域でＮＯｘを除去する無触媒脱
硝装置２が設置される場合もある。焼却炉１からの排ガ
スは、排熱回収ボイラやガス冷却塔３、さらに空気予熱
器４で減温され有害ガス除去装置５に導入される。有害
ガス除去装置５では通常、消石灰［Ｃａ（ＯＨ）2］が
排ガス中に注入され次式に示す反応により排ガス中の硫
黄酸化物（ＳＯｘ）や塩化水素（ＨＣｌ）がバグフィル
タ６で除去される。The municipal waste is incinerated in the incinerator 1. Nitrogen oxides (NOx) are generated with the incineration of municipal waste, so a non-catalytic denitration device 2 for injecting a reducing agent such as ammonia, ammonia water or urea water into the incinerator 1 to remove NOx in a high temperature range is installed. It may be done. Exhaust gas from the incinerator 1 is reduced in temperature by an exhaust heat recovery boiler, a gas cooling tower 3, and an air preheater 4 and introduced into a harmful gas removing device 5. In the harmful gas removing device 5, normally, slaked lime [Ca (OH) 2 ] is injected into the exhaust gas, and sulfur oxide (SOx) and hydrogen chloride (HCl) in the exhaust gas are removed by the bag filter 6 by the reaction shown by the following formula. It
【００２２】 Ｃａ（ＯＨ）2＋ＳＯ2＝ＣａＳＯ3＋Ｈ2Ｏ Ｃａ（ＯＨ）2＋２ＨＣ１＝ＣａＣｌ2＋２Ｈ2Ｏ また、バグフィルタ６では同時に焼却炉１より排出され
るダストおよびダイオキシン（ＤＸＮ）も除去される。
バグフィルタ６は、これらの有害物質を効率よく除去す
るために通常１２０〜１６０°Ｃの低温で運用される。Ca (OH) 2 + SO 2 = CaSO 3 + H 2 O Ca (OH) 2 + 2HC1 = CaCl 2 + 2H 2 O In addition, the bag filter 6 also removes dust and dioxin (DXN) discharged from the incinerator 1 at the same time. To be done.
The bag filter 6 is usually operated at a low temperature of 120 to 160 ° C in order to efficiently remove these harmful substances.
【００２３】さらに、排ガス中のＮＯｘを除去するため
に触媒脱硝装置８が設置されるが、排ガス温度が１２０
〜１６０°Ｃの低温では触媒の活性が低く触媒量が多く
ないこうした温度域ではバクフィルタ６より流出するＳ
ＯｘやＨＣｌが触媒脱硝装置８の還元剤であるアンモニ
ア等と反応して酸性硫安や塩化アンモニウムを生じ、触
媒の有効な細孔を閉塞してしまい触媒活性が低下するた
め好ましくない。Further, a catalytic denitration device 8 is installed to remove NOx in the exhaust gas, but the exhaust gas temperature is 120
At a low temperature of up to 160 ° C, the catalyst activity is low and the amount of catalyst is not large.
Ox and HCl react with the reducing agent of the catalyst denitration unit 8 such as ammonia to generate acidic ammonium sulfate and ammonium chloride, which block the effective pores of the catalyst and reduce the catalytic activity, which is not preferable.
【００２４】そこで、排ガス再加熱器７等を触媒脱硝装
置８の前流に設置して排ガス温度を１８０〜２５０°Ｃ
程度に昇温して脱硝処理するのが一般的である。Therefore, the exhaust gas reheater 7 and the like are installed in the upstream of the catalytic denitration device 8 to adjust the exhaust gas temperature to 180 to 250 ° C.
In general, the temperature is raised to some extent and denitration treatment is performed.
【００２５】本発明では、触媒脱硝装置８内の前流側に
一酸化窒素（ＮＯ）の酸化触媒（ａ）を充填しているの
でＮＯの一部はＮＯ2に変わり、さらに当該触媒脱硝装
置８内の後流側に設置される脱硝触媒（ｂ）によりＮＯ
とＮＯ2がほぼ等量の条件下で効率よく反応除去され
る。この際、排ガス温度１８０°Ｃ以上好ましくは２０
０〜２５０°Ｃで制御されているので触媒上で硝酸アン
モニウムが生成することはない。In the present invention, since the nitric oxide (NO) oxidation catalyst (a) is filled in the upstream side of the catalytic denitration device 8, a part of NO is changed to NO 2 , and the catalytic denitration device is further changed. NO by the denitration catalyst (b) installed on the downstream side of 8
And NO 2 are efficiently removed by reaction under substantially equal amounts. At this time, the exhaust gas temperature is 180 ° C or higher, preferably 20
Since it is controlled at 0 to 250 ° C, ammonium nitrate is not formed on the catalyst.
【００２６】本発明を適用した場合、その運用温度によ
り図８に示すようにＮＯ単独系に比べＮＯとＮＯ2が
１：１で共存する系では大幅な脱硝性能の向上が認めら
れるので触媒量の低減が可能となる。When the present invention is applied, as shown in FIG. 8, a system in which NO and NO 2 coexist at a ratio of 1: 1 as shown in FIG. Can be reduced.
【００２７】図３は、本発明にもとづく他の実施例とし
て、一酸化窒素（ＮＯ）の酸化触媒（ａ）をガス冷却塔
３、あるいは空気予熱器４の後流域に設置した場合のシ
ステムを示す。FIG. 3 shows, as another embodiment based on the present invention, a system in which a nitric oxide (NO) oxidation catalyst (a) is installed in the gas cooling tower 3 or in the downstream region of the air preheater 4. Show.
【００２８】本実施例によれば、一酸化窒素（ＮＯ）の
酸化触媒（ａ）が図６に示すように３００〜３５０°Ｃ
のＮＯの酸化性能が高い温度域に充填されるため、より
少ない酸化触媒（ａ）の量で効果的にＮＯ2が生成され
ることになる。According to this embodiment, the nitric oxide (NO) oxidation catalyst (a) is 300 to 350 ° C. as shown in FIG.
Since the NO oxidation performance of NO is filled in a high temperature range, NO 2 is effectively generated with a smaller amount of the oxidation catalyst (a).
【００２９】前記実施例では酸化触媒と脱硝触媒とを別
に設けたが、ＮＯの酸化機能と脱硝機能を併せ持つ触媒
を用いることも可能である。Although the oxidation catalyst and the denitration catalyst are separately provided in the above embodiment, it is possible to use a catalyst having both the NO oxidation function and the NOx removal function.
【００３０】[0030]
【発明の効果】本発明により以下に示す効果が期待でき
る。According to the present invention, the following effects can be expected.
【００３１】（ａ）より少ない触媒量で効率よく脱硝反
応を行うことができる。The denitration reaction can be efficiently carried out with a smaller amount of catalyst than (a).
【００３２】（ｂ）脱硝反応器がコンパクトにできる。(B) The denitration reactor can be made compact.
【００３３】（ｃ）脱硝装置での圧力損失が少ないので
小容量の誘引通風機で運転できる。(C) Since the pressure loss in the denitration device is small, it is possible to operate with a small capacity induction fan.
【００３４】（ｄ）経時的な触媒の劣化に対して、経済
的な触媒の積増法が適用し易くなる。(D) It becomes easy to apply the economical catalyst multiplication method to the deterioration of the catalyst with time.
【図１】本発明の実施例に係る脱硝システムのフローチ
ャートである。FIG. 1 is a flowchart of a denitration system according to an embodiment of the present invention.
【図２】従来の脱硝システムのフローチャートである。FIG. 2 is a flowchart of a conventional denitration system.
【図３】本発明の他の実施例に係る脱硝システムのフロ
ーチャートである。FIG. 3 is a flowchart of a denitration system according to another embodiment of the present invention.
【図４】脱硝触媒の温度特性図である。FIG. 4 is a temperature characteristic diagram of a denitration catalyst.
【図５】ＮＯｘ組成変化と脱硝率との関係を示す特性図
である。FIG. 5 is a characteristic diagram showing a relationship between a NOx composition change and a denitration rate.
【図６】ＮＯ酸化触媒の温度特性図である。FIG. 6 is a temperature characteristic diagram of a NO oxidation catalyst.
【図７】ＮＨ4ＮＯ3の析分席布を示す特性図である。FIG. 7 is a characteristic diagram showing an NH 4 NO 3 deposition cloth.
【図８】ＮＯｘ組成と脱硝率との関係を示す温度特性図
である。FIG. 8 is a temperature characteristic diagram showing the relationship between the NOx composition and the denitration rate.
【符号の説明】 １ 焼却炉 ３ ガス冷却塔 ４ 空気予熱器 ５ 有害ガス除去装置 ６ バグフィルタ ７ 排ガス再加熱器 ８ 脱硝装置 ａ ＮＯ酸化触媒 ｂ 脱硝触媒[Explanation of symbols] 1 incinerator 3 gas cooling tower 4 air preheater 5 harmful gas removal device 6 bag filter 7 exhaust gas reheater 8 denitration device a NO oxidation catalyst b denitration catalyst
───────────────────────────────────────────────────── 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 Ｂ０１Ｊ 23/34 Ａ 23/42 Ａ 23/75 Ｂ０１Ｄ 53/36 １０２ Ｇ Ｂ０１Ｊ 23/74 ３１１ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B01J 23/34 A 23/42 A 23/75 B01D 53/36 102 G B01J 23/74 311 A
Claims (3)
添加して脱硝触媒の下で選択的に接触還元させる低温脱
硝装置において、 前記脱硝触媒の前流側に、排ガス中の一酸化窒素を酸化
する酸化触媒を設けたことを特徴とする低温脱硝装置。1. A low-temperature denitration device for selectively catalytically reducing nitrogen oxides in exhaust gas in a low temperature range by adding a reducing agent under a denitration catalyst. A low-temperature denitration device equipped with an oxidation catalyst for oxidizing nitric oxide.
Ｔｉ−Ｍｎ系、Ｔｉ−Ｐｔ系、Ｔｉ−Ｃｏ系、Ｔｉ−Ｃ
ｒ系合金のグループから選択された触媒であることを特
徴とする低温脱硝装置。2. The oxidation catalyst according to claim 1, wherein the oxidation catalyst is Ti—Mn type, Ti—Pt type, Ti—Co type, Ti—C.
A low-temperature denitration device, which is a catalyst selected from the group of r-based alloys.
を添加して、脱硝触媒の下で選択的に接触還元させる低
温脱硝装置において、 前記脱硝触媒が排ガス中の一酸化窒素を酸化する酸化機
能を併せ持っていることを特徴とする低温脱硝装置。3. A low-temperature denitration device for selectively reducing catalytically reducing nitrogen oxides in exhaust gas in a low temperature range under a denitration catalyst, wherein the denitration catalyst oxidizes nitric oxide in the exhaust gas. A low-temperature denitration device characterized by having an oxidizing function that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6242935A JPH08103636A (en) | 1994-10-06 | 1994-10-06 | Low-temperature denitrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6242935A JPH08103636A (en) | 1994-10-06 | 1994-10-06 | Low-temperature denitrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08103636A true JPH08103636A (en) | 1996-04-23 |
Family
ID=17096412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6242935A Pending JPH08103636A (en) | 1994-10-06 | 1994-10-06 | Low-temperature denitrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08103636A (en) |
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| JP2002502927A (en) * | 1998-02-06 | 2002-01-29 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | NOx reduction mechanism in exhaust gas |
| JP2006320854A (en) * | 2005-05-20 | 2006-11-30 | Hino Motors Ltd | Selective reduction type catalyst and exhaust gas purifier of engine for use therein |
| WO2011162030A1 (en) | 2010-06-24 | 2011-12-29 | エヌ・イー ケムキャット株式会社 | Exhaust gas catalytic purging unit using selective reduction catalyst, exhaust gas purging method, and diesel automobile equipped with exhaust gas catalytic purging unit |
| US8105542B2 (en) | 2007-06-19 | 2012-01-31 | Hino Motors, Ltd. | Engine exhaust gas purifier |
| JP2012061470A (en) * | 2000-04-22 | 2012-03-29 | Umicore Ag & Co Kg | Method and catalyst for reducing nitrogen oxide contained in lean exhaust gas of internal combustion engine, and method for manufacturing catalyst thereof |
| WO2012147376A1 (en) | 2011-04-28 | 2012-11-01 | エヌ・イー ケムキャット株式会社 | Off gas purification device |
| WO2013111457A1 (en) | 2012-01-23 | 2013-08-01 | エヌ・イーケムキャット株式会社 | Alumina material containing barium sulfate and exhaust gas purifying catalyst using same |
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| US8833062B1 (en) | 2013-03-15 | 2014-09-16 | Daimier Ag | Catalytic reduction of NOx |
| US8850802B1 (en) | 2013-03-15 | 2014-10-07 | Daimler Ag | Catalytic reduction of NOx |
| EP2990115A1 (en) | 2014-08-25 | 2016-03-02 | N.E. Chemcat Corporation | Urea hydrolysis catalyst, selective reduction catalyst containing urea hydrolysis material, and exhaust gas cleaning apparatus |
| DE102018121503A1 (en) | 2017-09-05 | 2019-03-07 | Umicore Ag & Co. Kg | Exhaust gas purification with NO oxidation catalyst and SCR-active particle filter |
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1994
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| JP2002502927A (en) * | 1998-02-06 | 2002-01-29 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | NOx reduction mechanism in exhaust gas |
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| JP2012061470A (en) * | 2000-04-22 | 2012-03-29 | Umicore Ag & Co Kg | Method and catalyst for reducing nitrogen oxide contained in lean exhaust gas of internal combustion engine, and method for manufacturing catalyst thereof |
| JP2006320854A (en) * | 2005-05-20 | 2006-11-30 | Hino Motors Ltd | Selective reduction type catalyst and exhaust gas purifier of engine for use therein |
| US8105542B2 (en) | 2007-06-19 | 2012-01-31 | Hino Motors, Ltd. | Engine exhaust gas purifier |
| WO2011162030A1 (en) | 2010-06-24 | 2011-12-29 | エヌ・イー ケムキャット株式会社 | Exhaust gas catalytic purging unit using selective reduction catalyst, exhaust gas purging method, and diesel automobile equipped with exhaust gas catalytic purging unit |
| WO2012147376A1 (en) | 2011-04-28 | 2012-11-01 | エヌ・イー ケムキャット株式会社 | Off gas purification device |
| US9523302B2 (en) | 2011-04-28 | 2016-12-20 | N.E. Chemcat Corporation | Off gas purification device |
| WO2013111457A1 (en) | 2012-01-23 | 2013-08-01 | エヌ・イーケムキャット株式会社 | Alumina material containing barium sulfate and exhaust gas purifying catalyst using same |
| WO2013172128A1 (en) | 2012-05-14 | 2013-11-21 | エヌ・イーケムキャット株式会社 | Exhaust gas purifier |
| US9480948B2 (en) | 2012-05-14 | 2016-11-01 | N.E. Chemcat Corporation | Exhaust gas purifier |
| US8833062B1 (en) | 2013-03-15 | 2014-09-16 | Daimier Ag | Catalytic reduction of NOx |
| US8850802B1 (en) | 2013-03-15 | 2014-10-07 | Daimler Ag | Catalytic reduction of NOx |
| EP2990115A1 (en) | 2014-08-25 | 2016-03-02 | N.E. Chemcat Corporation | Urea hydrolysis catalyst, selective reduction catalyst containing urea hydrolysis material, and exhaust gas cleaning apparatus |
| DE102018121503A1 (en) | 2017-09-05 | 2019-03-07 | Umicore Ag & Co. Kg | Exhaust gas purification with NO oxidation catalyst and SCR-active particle filter |
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