JPH07116471A - Denitration method - Google Patents

Denitration method

Info

Publication number
JPH07116471A
JPH07116471A JP5269296A JP26929693A JPH07116471A JP H07116471 A JPH07116471 A JP H07116471A JP 5269296 A JP5269296 A JP 5269296A JP 26929693 A JP26929693 A JP 26929693A JP H07116471 A JPH07116471 A JP H07116471A
Authority
JP
Japan
Prior art keywords
denitration
acetic acid
ammonium acetate
catalyst
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
Application number
JP5269296A
Other languages
Japanese (ja)
Inventor
Takeshi Misawa
武 三沢
Yoshihiko Asano
義彦 浅野
Masamichi Kuramoto
政道 倉元
Yoshio Nakajima
義雄 中島
Kaoru Kitakizaki
薫 北寄崎
Hoki Haba
方紀 羽場
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd filed Critical Meidensha Corp
Priority to JP5269296A priority Critical patent/JPH07116471A/en
Publication of JPH07116471A publication Critical patent/JPH07116471A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To denitrate efficiently a gas containing NOx such as exhaust gas by the catalytic reaction between a denitration agent which is obtained by making catalytic metal supported with Y-type zeolite and the gas containing NOx in the presence of acetic acid and/or ammonium acetate. CONSTITUTION:A denitration agent 11 which is obtained by making a catalytic metal (e.g, Fe, Cu, Ni, Mn) supported with Y-type zeolite and a gas containing NOx which is introduced to a denitration tube 2 through a gas leading pipe 3 are subjected to a catalytic reaction to remove NOx. In the reaction, the denitration agent 11 is kept at a specified temperature (e.g. 300-600 deg.C) by a heater 8, and an 1-10% aqueous solution of acetic acid and/or ammonium acetate is sprayed from a nozzle 7. As a result, the deterioration, etc., of the catalyst caused by SOx, etc., in exhaust gas are reduced to increase the denitration ration and to extend the catalyst lift. Acetic acid, ammonium acetate, etc., which can be used as liquid, can be used to secure the safety and to facilitate the handling.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はNOxの除去技術に関
し、特に内燃機関の排煙等のNOx含有ガスからNOx
除去する技術に関する。
The present invention relates to an elimination technology NO x, relates to a technique for especially removing NO x from the NO x containing gas such as flue gas of the internal combustion engine.

【0002】[0002]

【従来の技術】従来、NOx処理技術は種々の分野で必
要とされている。例えばディーゼル発電機等の排気ガス
中に存在するNOxは人体に有害であり、また酸性雨の
発生原因ともなるので排気ガス中のNOxを効果的に処
理することが望まれている。
2. Description of the Related Art Conventionally, NO x processing technology has been required in various fields. For example, NO x present in exhaust gas of a diesel generator or the like is harmful to the human body and causes generation of acid rain. Therefore, it is desired to effectively treat NO x in the exhaust gas.

【0003】このようなNOx除去方法として、例えば
自動車(ガソリン車)に用いられている三元触媒法、ア
ンモニアを用いる選択接触還元法が挙げられる。
Examples of such NO x removal methods include a three-way catalyst method used in automobiles (gasoline vehicles) and a selective catalytic reduction method using ammonia.

【0004】しかし、上記三元触媒法は特に酸素過剰の
排気ガスの脱硝を行う場合に触媒の劣化が進み、触媒寿
命が短くなってしまう。
However, in the above-mentioned three-way catalyst method, particularly when denitration of exhaust gas with excess oxygen is carried out, the deterioration of the catalyst progresses and the life of the catalyst is shortened.

【0005】また、アンモニアを用いる選択接触還元法
にては有害で危険なアンモニアガスを使用するので、そ
の取り扱いに注意を必要となる。更に排気ガス中の他の
成分によって還元触媒が劣化してしまうので触媒交換の
作業が必要となり、特に高価な貴金属系の触媒を使用す
る場合は経済的に不利となる。
Further, in the selective catalytic reduction method using ammonia, harmful and dangerous ammonia gas is used, so that it is necessary to handle it with caution. Furthermore, since the reduction catalyst is deteriorated by other components in the exhaust gas, it is necessary to replace the catalyst, which is economically disadvantageous when a particularly expensive noble metal-based catalyst is used.

【0006】従って、例えば特開昭63−283727
号公報に開示されているように、各種金属を含むゼオラ
イトを炭化水素の存在下でNOxを含むガスと接触させ
る方法が研究されており、既に実用化もされている。
Therefore, for example, Japanese Patent Laid-Open No. 63-283727.
As disclosed in the publication, a method of contacting a zeolite containing various metals with a gas containing NO x in the presence of hydrocarbons has been studied and has already been put to practical use.

【0007】[0007]

【発明が解決しようとする課題】しかし、上記ゼオライ
トを用いた脱硝方法にては触媒成分としてゼオライトに
含まれる各種金属が排気ガス中の硫黄酸化物(SOx
等によって被毒され、触媒活性が低下してしまう。
However, in the denitration method using the above zeolite, various metals contained in the zeolite as a catalyst component are sulfur oxides (SO x ) in the exhaust gas.
It will be poisoned by the above and the catalytic activity will decrease.

【0008】また、この脱硝方法で還元剤として用いて
いる炭化水素は高温排気ガス中で容易に燃焼してしまう
ので、実際に触媒上で還元剤として有効に作用する炭化
水素量は小さい。
Further, since the hydrocarbon used as the reducing agent in this denitration method is easily combusted in the high temperature exhaust gas, the amount of the hydrocarbon effectively acting as the reducing agent on the catalyst is small.

【0009】本発明は上記背景の下になされたものであ
り、排気ガス等のNOx含有ガスの脱硝を効率良く行う
ことを目的とする。
[0009] The present invention has been made under the above circumstances, and an object thereof to perform denitration of the NO x containing gas such as the exhaust gas efficiently.

【0010】[0010]

【課題を解決するための手段及び作用】上記課題を解決
するために、本発明はY型ゼオライトに触媒金属を担持
させて得られる脱硝剤とNOx含有ガスとを酢酸および
/または酢酸アンモニウムの共存下で接触反応させてN
xの除去を行うことを特徴とする脱硝方法を提供す
る。
To solve SUMMARY and operation for solving the above problems, the present invention provides a denitrating agent and NO x containing gas obtained by supporting a catalytic metal on zeolite Y of acetic acid and / or ammonium acetate Contact reaction under coexistence with N
Provided is a denitration method characterized by removing O x .

【0011】また、Y型ゼオライトに触媒金属を担持さ
せて得られる脱硝剤とNOx含有ガスとを接触反応させ
てNOxの除去を行う脱硝方法において、前記脱硝剤と
NOx含有ガスとの接触反応時に酢酸及び/または酢酸
アンモニウムの1〜10%水溶液を噴霧することを特徴
とする脱硝方法も提供される。
In addition, in the denitration method for removing NO x by contacting the NO x- containing gas obtained by supporting the catalytic metal on the Y-type zeolite and removing the NO x- containing gas, the denitration agent and the NO x- containing gas are A denitration method is also provided, which comprises spraying a 1-10% aqueous solution of acetic acid and / or ammonium acetate during the contact reaction.

【0012】前記触媒金属としては、好ましくは(F
e、Cu、Ni、Mn)の各金属のうち少なくとも一種の金
属を用いる。
The catalyst metal is preferably (F
At least one kind of metal among e, Cu, Ni, and Mn) is used.

【0013】以下、本発明について更に詳細に説明す
る。
The present invention will be described in more detail below.

【0014】ゼオライトやアルミナ等の担体にV、C
r、Cu、Fe、Mo、W、Mn、Mg、Ru、Rh等の金
属を担持させると、活性点を発現して脱硝作用が得られ
る。
V, C on a carrier such as zeolite or alumina
When a metal such as r, Cu, Fe, Mo, W, Mn, Mg, Ru, or Rh is supported, active sites are expressed and a denitration action is obtained.

【0015】しかし、実際に上記のように金属をゼオラ
イト等の担体に担持させた脱硝剤を用いてディーゼルエ
ンジンの排気ガスと接触反応させて脱硝を行う場合には
脱硝性能が劣化してしまう。
However, when denitration is carried out by catalytically reacting with the exhaust gas of a diesel engine using a denitration agent in which a metal is supported on a carrier such as zeolite as described above, the denitration performance deteriorates.

【0016】その原因としては排気ガス中に含まれるS
xガス(硫黄硫化物)がゼオライト表面を被覆し、ま
た触媒活性金属とも反応して触媒毒となることが挙げら
れる。
The cause is S contained in the exhaust gas.
It can be mentioned that O x gas (sulfur sulfide) coats the surface of zeolite and also reacts with the catalytically active metal to become a catalyst poison.

【0017】これに対し、上記NOxガスと脱硝剤との
接触反応時に酢酸や酢酸アンモニウムを還元剤として共
存させると、SOxガスは還元剤と優先的に反応するの
で、SOxガスがゼオライト表面を被覆することが抑制
される。
[0017] In contrast, when the coexistence of acetate and ammonium acetate on contact reaction of the NO x gas and denitrating agent as reducing agent, since SO x gas reacts preferentially with a reducing agent, SO x gas is zeolite Covering the surface is suppressed.

【0018】上記還元剤を共存させる方法としては、例
えば脱硝時に還元剤の溶液を噴霧する等の方法が挙げら
れる。
As a method of coexisting the reducing agent, for example, a method of spraying a solution of the reducing agent at the time of denitration can be mentioned.

【0019】尚、ゼオライトとしてはアルカリ金属型ゼ
オライトを用いることが好ましく、特にY型ゼオライト
を用いることが好ましい。
It is preferable to use an alkali metal type zeolite as the zeolite, and it is particularly preferable to use a Y type zeolite.

【0020】このゼオライトに担持させる金属として、
好ましくはFe、Cu、Ni、Mn等を用いる。金属の担持
方法としては種々の方法があるが、好ましくはゼオライ
トを所定の濃度の金属塩溶液中に浸漬し、このゼオライ
トの細孔中に触媒金属が十分に拡散したことを確認した
後にそのまま金属塩溶液を蒸発させるか、または浸漬し
たゼオライトを引き上げて水溶液中から取り出し、次に
ゼオライト中に含まれる水分を除去する。
As the metal supported on this zeolite,
Fe, Cu, Ni, Mn and the like are preferably used. There are various methods for supporting the metal, but preferably the zeolite is immersed in a metal salt solution having a predetermined concentration, and the metal is used as it is after confirming that the catalyst metal is sufficiently diffused in the pores of the zeolite. The salt solution is evaporated or the immersed zeolite is pulled out from the aqueous solution, and then the water content in the zeolite is removed.

【0021】このように金属塩とゼオライトとを接触さ
せることによってイオン交換等が起こり、金属がゼオラ
イトに担持される。尚、本明細書にてはこのようなイオ
ン交換等に限らず、物理的、化学的を問わず金属とゼオ
ライトとが一体化された状態を担持と記載する。
By thus bringing the metal salt and the zeolite into contact with each other, ion exchange or the like occurs, and the metal is supported on the zeolite. In the present specification, the state in which the metal and the zeolite are integrated, regardless of physical or chemical, is described as carrying, not limited to such ion exchange.

【0022】上記金属の塩は脱硝を阻害するものでなけ
れば特に制限はなく、例えば硝酸塩、酢酸塩等を用い
る。
The metal salt is not particularly limited as long as it does not inhibit denitration, and nitrates, acetates and the like are used.

【0023】[0023]

【実施例】本実施例においては、Y型ゼオライトに(F
e、Ni、Cu、Mn)のうち一種類の金属をイオン交換に
よって含浸して触媒を作成し、更に還元剤の存在下で過
剰酸素を含む排気ガスを接触させて脱硝を行った。この
際の還元剤として酢酸(実施例1)、酢酸アンモニウム
(実施例2)、酢酸と酢酸アンモニウムとの混合水溶液
(実施例3)をそれぞれ用いた。
EXAMPLE In this example, Y type zeolite (F
One of metals (e, Ni, Cu, Mn) was impregnated by ion exchange to prepare a catalyst, and exhaust gas containing excess oxygen was contacted in the presence of a reducing agent for denitration. At this time, acetic acid (Example 1), ammonium acetate (Example 2), and a mixed aqueous solution of acetic acid and ammonium acetate (Example 3) were used as reducing agents.

【0024】尚、脱硝率の測定は図1に示す脱硝装置を
用いて行った。
The denitration rate was measured using the denitration device shown in FIG.

【0025】図1において1は脱硝装置本体であり、標
準ガス(NO/N2,NO:1000(ppm))はガス導入
管3を通じて脱硝管2に導入される。その流量は流量調
節バルブ4によって調整され、標準ガスの余剰分はバイ
パス管4を通じて外部へ排気される。
In FIG. 1, reference numeral 1 is a main body of the denitration device, and standard gas (NO / N 2 , NO: 1000 (ppm)) is introduced into the denitration pipe 2 through a gas introduction pipe 3. The flow rate is adjusted by the flow rate control valve 4, and the surplus standard gas is exhausted to the outside through the bypass pipe 4.

【0026】脱硝管2の中央部にはハニカム形状の脱硝
剤(ハニカム触媒)を保持する触媒ホルダー6が設けら
れており、これにより触媒11が支持される。これら触
媒ホルダー6及び触媒11付近はヒーター8によって所
定温度に保持されている。
A catalyst holder 6 for holding a honeycomb-shaped denitration agent (honeycomb catalyst) is provided in the central portion of the denitration pipe 2, and the catalyst 11 is supported thereby. The vicinity of the catalyst holder 6 and the catalyst 11 is maintained at a predetermined temperature by a heater 8.

【0027】脱硝管2のガス流入部3とハニカム触媒ホ
ルダー6側には還元剤溶液を噴射するノズル7が挿入さ
れており、脱硝時には0.1(cc/s)〜1(cc/s)の範囲で還元
剤を噴き出す。
A nozzle 7 for injecting a reducing agent solution is inserted into the gas inflow portion 3 of the denitration pipe 2 and the honeycomb catalyst holder 6 side, and in the denitration, the range is 0.1 (cc / s) to 1 (cc / s). And spew out the reducing agent.

【0028】脱硝された標準ガスは、処理ガスとして処
理ガス排出管9を通じて質量分析計(日電アネルバ製、
AQA−360)12及びNOx分析計(島津製作所
製、NOA−307DX)10にてNOx除去率を測定
される構成となっている。
The denitrated standard gas is used as a processing gas through a processing gas discharge pipe 9 for mass spectrometry (manufactured by Nichiden Anelva,
AQA-360) 12 and NO x analyzer (manufactured by Shimadzu Corporation, are configured to be measuring the NO x removal rate at NOA-307DX) 10.

【0029】また、脱硝剤は以下のように製造した。The denitration agent was manufactured as follows.

【0030】まず、Na含有Y型ゼオライト(NaY型ゼ
オライト:東ソー社製、HSZ−320NAA)の粉末
に対して粘土及びガラス繊維を30(%)混合して混練
した後にハニカム形状に成形加工した。
First, 30% of clay and glass fibers were mixed and kneaded with a powder of Na-containing Y-type zeolite (NaY-type zeolite: manufactured by Tosoh Corporation, HSZ-320NAA), and then formed into a honeycomb shape.

【0031】このハニカムを天日で1日乾燥した後に、
乾燥器にて50℃で10時間、100℃で5時間それぞ
れ乾燥し、更に750℃で2時間焼成して触媒母材とし
た。次に、この触媒母材にイオン交換法によってFe、C
u、Ni、Mnの各金属を担持させて脱硝剤を製造した。
以下にその製造方法を示す。
After drying this honeycomb for one day in the sun,
It was dried at 50 ° C. for 10 hours and at 100 ° C. for 5 hours in a dryer, and further calcined at 750 ° C. for 2 hours to obtain a catalyst base material. Next, Fe and C are added to the catalyst base material by an ion exchange method.
A denitration agent was manufactured by supporting u, Ni, and Mn metals.
The manufacturing method is shown below.

【0032】まず、Feをイオン交換してゼオライトに
担持させることにより脱硝剤を製造した。
First, a denitration agent was manufactured by carrying out ion exchange of Fe and supporting it on zeolite.

【0033】0.6(mol/l)酢酸アンモニウム水溶液50
0(ml)に0.1(N)酢酸水溶液500(ml)を加え
て1リットルとし、更にこの混合水溶液に硝酸鉄あるい
は酢酸鉄を0.1(mol/l)濃度に調整して加えた。
0.6 (mol / l) ammonium acetate aqueous solution 50
To 0 (ml), 500 (ml) of 0.1 (N) acetic acid aqueous solution was added to make 1 liter, and iron nitrate or iron acetate was further adjusted to a concentration of 0.1 (mol / l) and added to this mixed aqueous solution.

【0034】この鉄を含有する水溶液に上記ハニカム成
形体を2時間浸漬し、イオン交換によってコバルトを含
有するゼオライトを得た。この際溶液の温度を50〜6
0(℃)に保ちながら脱気下でイオン交換を行うことが好
ましい。
The above-mentioned honeycomb formed body was dipped in this iron-containing aqueous solution for 2 hours to obtain cobalt-containing zeolite by ion exchange. At this time, the temperature of the solution is 50 to 6
Ion exchange is preferably performed under degassing while maintaining the temperature at 0 (° C).

【0035】その後にハニカムを取り出し、純水で洗浄
した後に純水中に30分間浸漬して不純物を除去し、こ
のハニカムを150℃で8時間乾燥してゼオライト触媒
を得た。
After that, the honeycomb was taken out, washed with pure water and then immersed in pure water for 30 minutes to remove impurities, and this honeycomb was dried at 150 ° C. for 8 hours to obtain a zeolite catalyst.

【0036】同様に、硝酸銅あるいは酢酸銅を用いてC
uを担持した脱硝剤を製造した。Niに対しては硝酸ニッ
ケルあるいは硫酸ニッケルを用い、Mnに対しては塩化
マンガンを用いて上記Feを担持する脱硝剤の製造方法
と同様にして各金属を担持した脱硝剤を製造した。
Similarly, by using copper nitrate or copper acetate, C
A denitration agent supporting u was manufactured. A denitration agent supporting each metal was manufactured by using nickel nitrate or nickel sulfate for Ni and manganese chloride for Mn in the same manner as the method for manufacturing the denitration agent supporting Fe.

【0037】尚、イオン交換に利用する金属塩は上記例
に限定されるものではなく、適宜種々の塩を用いること
ができる。
The metal salt used for ion exchange is not limited to the above examples, and various salts can be used as appropriate.

【0038】これら脱硝剤は反応温度300〜600
(℃)で作用し、反応圧力には特に制限されず有効に反応
する。また、空間速度(SV値:ガスを触媒へ流入する
速度)は、反応温度等の条件及び要求されるNOx除去
率によって異なり、特に制限はないが、約500〜10
0000(Hr-1),好ましくは約100〜10000
(Hr-1)程度とする。
These denitration agents have reaction temperatures of 300 to 600.
It acts at (° C), and the reaction pressure is not particularly limited, and it reacts effectively. The space velocity (SV value: velocity of gas flowing into the catalyst) varies depending on conditions such as reaction temperature and the required NO x removal rate, and is not particularly limited, but is about 500 to 10
0000 (Hr −1 ), preferably about 100 to 10,000
(Hr -1 )

【0039】実施例1 上記各金属を担持した脱硝剤のそれぞれに対し、還元剤
として3%の酢酸水溶液を用い、図1の脱硝装置によっ
て脱硝率を測定した。その結果を表1に示す。
Example 1 A denitration ratio was measured by the denitration apparatus shown in FIG. 1 using a 3% acetic acid aqueous solution as a reducing agent for each of the denitration agents carrying the above metals. The results are shown in Table 1.

【0040】[0040]

【表1】 [Table 1]

【0041】この表に示されるように、各脱硝剤におい
てはNOの除去率が90〜93%程度になっており、高
い脱硝率が得られていることがわかる。
As shown in this table, in each denitration agent, the NO removal rate is about 90 to 93%, which shows that a high denitration rate is obtained.

【0042】本実施例では還元剤である酢酸水溶液の濃
度を3%としたが、酢酸水溶液の濃度は1〜10(%)
の範囲で上記実施例とほぼ同様の脱硝率が得られる。但
し濃度が薄い場合やSV値が大きい時は噴霧量を多くす
る必要がある。
In this embodiment, the concentration of the acetic acid aqueous solution as the reducing agent was set to 3%, but the concentration of the acetic acid aqueous solution is 1 to 10 (%).
Within this range, a denitration rate similar to that in the above-mentioned embodiment can be obtained. However, when the concentration is low or the SV value is high, it is necessary to increase the spray amount.

【0043】また、濃度10(%)以上の酢酸水溶液また
は酢酸(濃度100(%))を用いると脱硝性能は更に向
上するが、あまり濃度が高くなると取り扱いに注意を要
し、また噴霧条件によっては未反応の酢酸が残るので好
ましくない。
When an acetic acid aqueous solution having a concentration of 10% or more or acetic acid (concentration of 100%) is used, the denitrification performance is further improved, but if the concentration is too high, care must be taken in handling and depending on the spraying conditions. Is not preferable because unreacted acetic acid remains.

【0044】実施例2 実施例2においては還元剤として1〜10(mol/l)の酢
酸アンモニウム水溶液を用い、他は実施例1と同条件に
てFe、Cu、Ni、Mnの各金属を担持した脱硝剤それぞ
れにおける脱硝率を測定した。
Example 2 In Example 2, 1 to 10 (mol / l) ammonium acetate aqueous solution was used as a reducing agent, and Fe, Cu, Ni and Mn metals were added under the same conditions as in Example 1. The denitration rate of each of the loaded denitration agents was measured.

【0045】その結果を表2に示す。The results are shown in Table 2.

【0046】[0046]

【表2】 [Table 2]

【0047】表2に示されるようにNOガスは77〜8
0(%)程度除去されており、高い脱硝率が確認された。
As shown in Table 2, NO gas is 77-8.
About 0 (%) was removed, and a high denitration rate was confirmed.

【0048】従って、この還元剤を用いても十分に脱硝
が行われることがわかる。
Therefore, it can be seen that even if this reducing agent is used, denitration is sufficiently performed.

【0049】本実施例では還元剤である酢酸アンモニウ
ム水溶液の濃度を1〜10(mol/l)とした。この濃度は
使用条件によって調整することが好ましく、濃度が薄い
場合やSV値が大きい時は噴霧量を多くする。
In this embodiment, the concentration of the ammonium acetate aqueous solution as a reducing agent is set to 1 to 10 (mol / l). This concentration is preferably adjusted depending on the use conditions, and when the concentration is low or the SV value is high, the spray amount is increased.

【0050】また、濃度10(mol/l)以上の酢酸アンモ
ニウム水溶液または酢酸アンモニウム(濃度100
(%))を用いると脱硝性能は更に向上するが、あまり濃
度が高くなると取り扱いに注意を要し、また噴霧条件に
よっては未反応の酢酸アンモニウムが残るので好ましく
ない。
Further, an ammonium acetate aqueous solution having a concentration of 10 (mol / l) or more or ammonium acetate (concentration 100
(%)) Further improves the denitration performance, but if the concentration is too high, handling will be necessary and unreacted ammonium acetate will remain depending on the spraying conditions, which is not preferable.

【0051】実施例3 実施例3においては還元剤として酢酸と酢酸アンモニウ
ム(1+1)との混合液(濃度10%)を用い、他は実
施例1と同条件にて脱硝を行った。
Example 3 In Example 3, denitration was performed under the same conditions as in Example 1 except that a mixed solution of acetic acid and ammonium acetate (1 + 1) (concentration 10%) was used as a reducing agent.

【0052】その結果、表3に示されるように80〜8
3%程度の除去率が得られた。
As a result, as shown in Table 3, 80 to 8
A removal rate of about 3% was obtained.

【0053】[0053]

【表3】 [Table 3]

【0054】この実施例では還元剤として酢酸と酢酸ア
ンモニウム水溶液の混合液を用いた(濃度1〜10
(%)。この濃度は使用条件によって調整することが好ま
しく、濃度が薄い場合やSV値が大きい時は噴霧量を多
くする。
In this embodiment, a mixed solution of acetic acid and an aqueous solution of ammonium acetate was used as the reducing agent (concentration: 1 to 10).
(%). This concentration is preferably adjusted depending on the use conditions, and when the concentration is low or the SV value is high, the spray amount is increased.

【0055】また、酢酸,酢酸アンモニウムを単独で用
いた場合と同様に、濃度10(%)以上の混合液を用いる
と脱硝性能は更に向上するが、あまり濃度が高くなると
取り扱いに注意を要し、また噴霧条件によっては未反応
の酢酸や酢酸アンモニウムが残るので好ましくない。
As in the case of using acetic acid and ammonium acetate alone, the NOx removal performance is further improved by using a mixed solution having a concentration of 10 (%) or more, but if the concentration is too high, care must be taken in handling. Moreover, unreacted acetic acid and ammonium acetate remain depending on the spraying conditions, which is not preferable.

【0056】以上説明したように、上記各実施例で用い
た酢酸や酢酸アンモニウム等は水溶液(または溶液)と
して用いることができるので、従来用いられているアン
モニア、プロパン等に比べて安全性が高く、貯蔵及び取
り扱いが容易である。
As described above, the acetic acid, ammonium acetate, etc. used in each of the above examples can be used as an aqueous solution (or solution), so that they are more safe than ammonia, propane, etc. which have been conventionally used. Easy to store and handle.

【0057】尚、本発明にて用いるゼオライトはアルカ
リ金属型ゼオライト全般を指すが、上記各実施例ではN
a含有Y型ゼオライト(NaY型ゼオライト)を用いた。
The zeolite used in the present invention refers to all alkali metal type zeolites in general.
An a-containing Y-type zeolite (NaY-type zeolite) was used.

【0058】[0058]

【発明の効果】本発明においては触媒金属を担持させた
ゼオライトとNOx含有ガスとを接触反応させる際に、
酢酸や酢酸アンモニウムを共存させることで排気ガス中
のSOx等による触媒劣化等が抑制される。
In the present invention, when the catalytic metal-supported zeolite and the NO x containing gas are catalytically reacted,
Coexistence of acetic acid and ammonium acetate suppresses catalyst deterioration due to SO x in the exhaust gas.

【0059】従って脱硝率が高くなるとともに、触媒寿
命も大きく向上する。
Therefore, the denitration rate is increased and the catalyst life is greatly improved.

【0060】また、従来の脱硝方法ではアンモニアやプ
ロパン等を用いており、その取り扱いに注意を要した
が、本発明においては上記アンモニアやプロパン等に代
えて液体として使用可能である酢酸や酢酸アンモニウム
等を用いることができるので、安全性が高く、また取り
扱いも容易である。
Further, in the conventional denitration method, ammonia, propane or the like is used, and it has been necessary to handle it with care. However, in the present invention, acetic acid or ammonium acetate which can be used as a liquid in place of the above-mentioned ammonia, propane, etc. Since it can be used, it is highly safe and easy to handle.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る脱硝装置の説明図。FIG. 1 is an explanatory diagram of a denitration device according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1…脱硝装置本体 2…脱硝管 3…ガス導入管 4…流量調節バルブ 5…バイパス管 6…触媒ホルダー 7…ノズル 8…ヒーター 9…処理ガス排出管 10…NOx分析計 11…触媒 12…質量分析計1 ... Denitration device main body 2 ... Denitration pipe 3 ... Gas introduction pipe 4 ... Flow rate control valve 5 ... Bypass pipe 6 ... Catalyst holder 7 ... Nozzle 8 ... Heater 9 ... Process gas discharge pipe 10 ... NO x analyzer 11 ... Catalyst 12 ... Mass spectrometer

───────────────────────────────────────────────────── 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 53/86 ZAB B01D 53/34 129 B 53/36 ZAB 101 B (72)発明者 中島 義雄 東京都品川区大崎2丁目1番17号 株式会 社明電舎内 (72)発明者 北寄崎 薫 東京都品川区大崎2丁目1番17号 株式会 社明電舎内 (72)発明者 羽場 方紀 東京都品川区大崎2丁目1番17号 株式会 社明電舎内─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location B01D 53/86 ZAB B01D 53/34 129 B 53/36 ZAB 101 B (72) Inventor Nakajima Yoshio Tokyo 2-1-17 Osaki, Shinagawa-ku, Stock Company Inside the company's Meidensha (72) Inventor Kaoru Kitayoseki Tokyo 2-1-117 Osaki, Shinagawa-ku Stock Company, inside the Meidensha (72) Inventor Haba Foki 2-1-17 Osaki, Shinagawa-ku Stock Company Meidensha

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 Y型ゼオライトに触媒金属を担持させて
得られる脱硝剤とNOx含有ガスとを酢酸および/また
は酢酸アンモニウムの共存下で接触反応させてNOx
除去を行うことを特徴とする脱硝方法。
1. A and characterized in that Y-type zeolite in the catalyst metal denitrating agent obtained by supporting and the NO x containing gas is contacted react in the presence of acetic acid and / or ammonium acetate to effect removal of the NO x Denitration method
【請求項2】 Y型ゼオライトに触媒金属を担持させて
得られる脱硝剤とNOx含有ガスとを接触反応させてN
xの除去を行う脱硝方法において、 前記脱硝剤とNOx含有ガスとの接触反応時に酢酸及び
/または酢酸アンモニウムの1〜10%水溶液を噴霧す
ることを特徴とする脱硝方法。
2. A NOx-containing gas obtained by supporting a catalytic metal on Y-type zeolite and a NO x- containing gas are subjected to a catalytic reaction to produce N 2.
In denitration method for removing the O x, denitration method characterized by spraying the 1-10% aqueous solution of acetic acid and / or ammonium acetate upon contact reaction between the denitration agent and NO x containing gas.
【請求項3】 請求項1または2記載の脱硝方法におい
て、 前記触媒金属として(Fe、Cu、Ni、Mn)の各金属の
うち少なくとも一種の金属を用いることを特徴とする脱
硝方法。
3. The denitration method according to claim 1, wherein at least one metal selected from the metals (Fe, Cu, Ni, Mn) is used as the catalyst metal.
JP5269296A 1993-10-28 1993-10-28 Denitration method Pending JPH07116471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5269296A JPH07116471A (en) 1993-10-28 1993-10-28 Denitration method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5269296A JPH07116471A (en) 1993-10-28 1993-10-28 Denitration method

Publications (1)

Publication Number Publication Date
JPH07116471A true JPH07116471A (en) 1995-05-09

Family

ID=17470378

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5269296A Pending JPH07116471A (en) 1993-10-28 1993-10-28 Denitration method

Country Status (1)

Country Link
JP (1) JPH07116471A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612010A (en) * 1995-01-25 1997-03-18 Gas Metropolitain & Company, Limited Selective catalytic reduction of nitrogen oxides
CN114887629A (en) * 2022-06-10 2022-08-12 常州大学 Preparation method of low-temperature SCR denitration catalyst, product and application of product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5612010A (en) * 1995-01-25 1997-03-18 Gas Metropolitain & Company, Limited Selective catalytic reduction of nitrogen oxides
CN114887629A (en) * 2022-06-10 2022-08-12 常州大学 Preparation method of low-temperature SCR denitration catalyst, product and application of product

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