JPH10118492A - Catalyst for removing nitrogen dioxide and method therefor - Google Patents
Catalyst for removing nitrogen dioxide and method thereforInfo
- Publication number
- JPH10118492A JPH10118492A JP8274448A JP27444896A JPH10118492A JP H10118492 A JPH10118492 A JP H10118492A JP 8274448 A JP8274448 A JP 8274448A JP 27444896 A JP27444896 A JP 27444896A JP H10118492 A JPH10118492 A JP H10118492A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- nitrogen dioxide
- denitration
- nox
- 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.)
- Withdrawn
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 30
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 title claims abstract description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000010949 copper Substances 0.000 claims abstract description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 3
- 239000000084 colloidal system Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims 1
- 239000001569 carbon dioxide Substances 0.000 claims 1
- 229910000431 copper oxide Inorganic materials 0.000 claims 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 229910002089 NOx Inorganic materials 0.000 abstract description 20
- 239000000203 mixture Substances 0.000 abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 239000011651 chromium Substances 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 229910052720 vanadium Inorganic materials 0.000 description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は排ガス中の二酸化窒
素（ＮＯ2 ）を除去する触媒及びＮＯ2 を除去する方法
に関するものである。ＮＯ2 の発生源としては、道路ト
ンネルにおける換気ガス中のＮＯｘを吸着除去した吸着
剤の再生時や、硝酸の製造時等に発生するＮＯ2 等があ
る。本発明は、これらのＮＯ2 を還元剤であるＮＨ3 に
よって所要温度範囲で選択的接触還元に付して無害なＮ
2 に変換するＮＯ2 除去用触媒、およびこの触媒を用い
たＮＯ2 除去方法に関するものである。[0001] 1. Field of the Invention [0002] The present invention relates to a catalyst for removing nitrogen dioxide (NO 2 ) in exhaust gas and a method for removing NO 2 . NO 2 is generated at the time of regeneration of an adsorbent which adsorbs and removes NOx in ventilation gas in a road tunnel, NO 2 generated at the time of producing nitric acid, and the like. According to the present invention, harmless N 2 is obtained by subjecting these NO 2 to selective catalytic reduction with a reducing agent NH 3 in a required temperature range.
The present invention relates to a NO 2 removal catalyst that is converted to 2 , and a NO 2 removal method using the catalyst.
【０００２】[0002]
【従来の技術】従来のＮＯ2 脱硝法は、バナジウム・タ
ングステン担持チタニア触媒を用いて、還元剤であるア
ンモニアや尿素等により、被処理ガス中のＮＯ2 を無害
なＮ2に選択的に還元分解して除去するものであった。 2. Description of the Related Art In a conventional NO 2 denitration method, NO 2 in a gas to be treated is selectively reduced to harmless N 2 by a reducing agent such as ammonia or urea using a titania catalyst carrying vanadium / tungsten. It was decomposed and removed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記脱
硝法では、後述の通り、被処理ガス中におけるＮＯｘの
成分モル比がＮＯ2 ＞ＮＯの場合には、ＮＯ2 ≦ＮＯの
場合よりも触媒活性が低いという問題があった。However, in the above-mentioned denitration method, as described later, when the component molar ratio of NOx in the gas to be treated is NO 2 > NO, the catalytic activity is higher than when NO 2 ≦ NO. Was low.
【０００４】図１には反応温度２５０℃におけるＮＯ／
ＮＯｘ比と脱硝率の関係が示されている。この場合の脱
硝条件は、以下の通りである。FIG. 1 shows NO / at a reaction temperature of 250 ° C.
The relationship between the NOx ratio and the denitration rate is shown. The denitration conditions in this case are as follows.
【０００５】面積速度（ＡＶ）：３５Ｎｍ3 ／ｍ2 ・
ｈ、被処理ガスは、空気（Ｈ2 Ｏ：約３％）、ＮＯｘ：
９０ｐｐｍ、ＮＨ3 ：９０ｐｐｍである。Area velocity (AV): 35 Nm 3 / m 2 ·
h, the gas to be treated is air (H 2 O: about 3%), NOx:
90 ppm, NH 3 : 90 ppm.
【０００６】ここで、ＮＯ／ＮＯｘ比が０．５（ＮＯ：
ＮＯ2 ＝１：１）の時に触媒の脱硝性能が最大となり、
ＮＯ／ＮＯｘ比が０．５より低くなる（ＮＯ2 リッチ）
ほど脱硝性能が低下する。Here, when the NO / NOx ratio is 0.5 (NO:
When NO 2 = 1: 1), the denitration performance of the catalyst becomes maximum,
NO / NOx ratio becomes lower than 0.5 (NO 2 rich)
The lower the denitration performance, the lower the denitration performance.
【０００７】図２は、ＮＯ2 −ＮＨ3 反応の温度と脱硝
率の関係を示すグラフである。図２より、１５０℃〜３
００℃の温度範囲では、脱硝活性は少しあるものの非常
に乏しいことがわかる。FIG. 2 is a graph showing the relationship between the temperature of the NO 2 —NH 3 reaction and the denitration rate. From FIG.
It can be seen that in the temperature range of 00 ° C., the denitration activity is a little, but very poor.
【０００８】本発明は、上記の点に鑑み、排ガスＮＯｘ
の組成比がＮＯ2 リッチである場合に１５０℃〜３００
℃の温度範囲での脱硝性能の向上を達成することができ
るＮＯ2 除去用触媒、およびこれを用いたＮＯ2 除去方
法を提供することを目的とするものである。[0008] In view of the above points, the present invention provides an exhaust gas NOx
When the composition ratio of is NO 2 rich 0.99 ° C. to 300
° C. NO 2 removing catalyst can achieve an improvement in denitration performance in the temperature range, and it is an object to provide a NO 2 removal method using the same.
【０００９】[0009]
【課題を解決するための手段】本発明によるＮＯ2 除去
用触媒は、酸化チタンを担体とし、マンガン、銅、クロ
ムのうち少なくとも一種の酸化物を担持することを特徴
とするものである。The catalyst for removing NO 2 according to the present invention is characterized by using titanium oxide as a carrier and carrying at least one oxide of manganese, copper and chromium.
【００１０】上記酸化チタンの担体は、好ましくは、不
燃性繊維プレフォーム体にチタニアコロイドを含浸さ
せ、これを乾燥又は焼成して得られた板状物である。The titanium oxide carrier is preferably a plate-like material obtained by impregnating a noncombustible fiber preform with a titania colloid and drying or calcining the colloid.
【００１１】本発明によるＮＯ2 除去方法は、図３にフ
ローを示すように、上記構成の触媒を用いて、排ガス中
の二酸化窒素を還元剤であるＮＨ3 によって１５０〜３
００℃の温度範囲で選択的接触還元に付してＮ2 に変換
する方法である。In the NO 2 removal method according to the present invention, as shown in the flow chart of FIG. 3, the nitrogen dioxide in the exhaust gas is reduced to 150 to 3 by the reducing agent NH 3 using the catalyst having the above-mentioned structure.
This is a method of performing selective catalytic reduction in a temperature range of 00 ° C. to convert to N 2 .
【００１２】本発明によるＮＯ2 除去方法において、Ｎ
Ｏ2 の一部はＮＯに還元されるため、上記構成の触媒と
共に、さらにその後流に非常に高活性を示すバナジウム
・タングステン担持チタニア触媒を配置してこれら前流
と後流の２種類の触媒を併用することが好ましい（図４
に示すフローを参照）。In the NO 2 removal method according to the present invention, N 2
Since a part of O 2 is reduced to NO, a vanadium / tungsten-supported titania catalyst exhibiting a very high activity is further arranged in the subsequent stream together with the catalyst having the above-mentioned structure, and these two kinds of catalysts, the upstream stream and the downstream stream, are provided. (FIG. 4)
(See the flow shown in Figure.)
【００１３】バナジウム・タングステン担持チタニア触
媒としては、従来公知のものが使用できる。As the vanadium / tungsten-supported titania catalyst, conventionally known ones can be used.
【００１４】[0014]
【発明の実施の形態】次に、本発明の実施形態について
説明する。Next, an embodiment of the present invention will be described.
【００１５】(1) 触媒の調製 セラミック繊維からなるセラミックペーパー（厚さ０．
２５ｍｍ）に、硝酸塩加水分解法で得られたチタニアコ
ロイド溶液（固形分３２重量％）を含浸せしめ、これを
１１０℃で１時間乾燥した後、４００℃で３時間焼成す
ることにより、アナターゼ型チタニアを９０ｇ／ｍ2 保
持した板状担体を得た。(1) Preparation of Catalyst A ceramic paper made of ceramic fibers (having a thickness of 0.1 mm).
25 mm) is impregnated with a titania colloid solution (solid content: 32% by weight) obtained by a nitrate hydrolysis method, dried at 110 ° C. for 1 hour, and calcined at 400 ° C. for 3 hours to obtain an anatase-type titania. Was obtained at 90 g / m 2 .
【００１６】この板状担体を硝酸マンガン水溶液（常
温）０．５Ｍに浸漬し、１１０℃で１時間乾燥後、４０
０℃で１時間焼成することにより、酸化マンガン担持チ
タニア板状触媒を得た。このときのＭｎ担持量は４．４
重量％であった。This plate-shaped carrier is immersed in an aqueous solution of manganese nitrate (normal temperature) 0.5M, dried at 110 ° C. for 1 hour,
By calcining at 0 ° C. for 1 hour, a manganese oxide-supported titania plate catalyst was obtained. At this time, the amount of supported Mn was 4.4.
% By weight.
【００１７】(2) 実験 ＮＯ2 脱硝実験は、固定床常圧流通反応器を用い、上記
板状触媒を同反応器に充填し、下記脱硝条件下に行い、
反応器の入口と出口のＮＯｘ濃度差より脱硝率を求め
た。(2) Experiment The NO 2 denitration experiment was carried out using a fixed-bed normal-pressure flow reactor, charging the above plate-shaped catalyst in the reactor, and performing the following denitration conditions:
The denitration rate was determined from the difference in NOx concentration between the inlet and outlet of the reactor.
【００１８】脱硝条件：面積速度（ＡＶ）：３５Ｎｍ3
／ｍ2 ・ｈ、被処理ガスは、空気（Ｈ2 Ｏ：約３％）、
ＮＯ2 ：９０ｐｐｍ、ＮＨ3 ：９０ｐｐｍ。実験条件に
応じて、ＮＨ3／ＮＯ2 比を０．５〜１．６の範囲で変
化させた。Denitration conditions: Area velocity (AV): 35 Nm 3
/ M 2 · h, the gas to be treated is air (H 2 O: about 3%),
NO 2 : 90 ppm, NH 3 : 90 ppm. The NH 3 / NO 2 ratio was changed in the range of 0.5 to 1.6 according to the experimental conditions.
【００１９】(3) 結果 図５は１５０〜３００℃の反応温度範囲におけるＮＯ2
反応特性を示す。同図から、上記板状触媒は１５０〜３
００℃の温度範囲で高いＮ2 へのＮＯ2 脱硝率を示し、
反応器において入口ＮＯ2 の一部がＮＯに還元され、出
口ＮＯｘのＮＯ／ＮＯｘ率が２５０℃では２１％、３０
０℃では５４％になっていることがわかる。(3) Results FIG. 5 shows NO 2 in the reaction temperature range of 150 to 300 ° C.
Shows reaction characteristics. As shown in FIG.
Shows a high NO 2 denitration rate to N 2 in the temperature range of 00 ° C.,
In the reactor, a part of the inlet NO 2 is reduced to NO, and the NO / NOx ratio of the outlet NOx is 21% and 30% at 250 ° C.
It can be seen that it is 54% at 0 ° C.
【００２０】図６は反応温度２５０℃におけるＮＨ3 ／
ＮＯ2 比と反応特性を示す。図７は反応温度３００℃に
おけるＮＨ3 ／ＮＯ2 比と反応特性を示す。これらの図
から、ＮＨ3 ／ＮＯ2 比を上げることにより脱硝率、出
口ＮＯ／ＮＯｘ率が向上していることがわかる。この出
口ＮＯ／ＮＯｘ率の向上により、上記板状触媒の後流に
バナジウム・タングステン担持チタニア触媒を配置して
これら前流と後流の２種類の触媒を併用することによっ
て、さらに高い脱硝率を得ることが可能となることがわ
かる。[0020] Figure 6 is NH at the reaction temperature 250 ° C. 3 /
The NO 2 ratio and the reaction characteristics are shown. FIG. 7 shows the NH 3 / NO 2 ratio and reaction characteristics at a reaction temperature of 300 ° C. From these figures, it is understood that the denitration rate and the exit NO / NOx rate are improved by increasing the NH 3 / NO 2 ratio. By improving the outlet NO / NOx ratio, a vanadium / tungsten-supported titania catalyst is disposed downstream of the plate-like catalyst, and the two types of catalysts, upstream and downstream, are used in combination, thereby achieving a higher denitration rate. It turns out that it becomes possible to obtain.
【００２１】[0021]
【発明の効果】本発明のＮＯ2 除去用触媒によれば、排
ガスＮＯｘの組成比がＮＯ2 リッチである場合にも１５
０℃〜３００℃の温度範囲での脱硝性能の向上を達成す
ることができる。よって本発明によるＮＯ2 除去用触媒
を用いることにより、道路トンネルにおける換気ガス中
のＮＯｘを吸着除去した吸着剤の再生時や、硝酸の製造
時等に発生するＮＯ2 を多量に含む排ガスの脱硝を低温
で容易に行うことができる。According to the catalyst for removing NO 2 of the present invention, even if the composition ratio of the exhaust gas NOx is rich in NO 2 ,
An improvement in the denitration performance in the temperature range of 0 ° C to 300 ° C can be achieved. Therefore, by using the catalyst for removing NO 2 according to the present invention, the denitration of exhaust gas containing a large amount of NO 2 generated at the time of regeneration of an adsorbent that adsorbs and removes NOx in ventilation gas in a road tunnel or during production of nitric acid, etc. Can be easily performed at a low temperature.
【図１】 ２５０℃におけるＮＯ／ＮＯｘ比とＮＯｘ脱
硝率の関係を示すグラフである。FIG. 1 is a graph showing the relationship between the NO / NOx ratio at 250 ° C. and the NOx denitration rate.
【図２】 温度とＮＯｘ脱硝率の関係を示すグラフであ
る。FIG. 2 is a graph showing the relationship between temperature and NOx denitration rate.
【図３】 請求項３の方法を示すフローシートである。FIG. 3 is a flow sheet illustrating the method of claim 3;
【図４】 請求項４の方法を示すフローシートである。FIG. 4 is a flow sheet illustrating the method of claim 4;
【図５】 温度とＮＯ2 脱硝率および出口ＮＯ／出口Ｎ
Ｏｘ率との関係を示すグラフである。FIG. 5: Temperature, NO 2 denitration rate, outlet NO / outlet N
It is a graph which shows the relationship with an Ox rate.
【図６】 ２５０℃におけるＮＨ3 ／ＮＯ2 比と脱硝率
および出口ＮＯ／出口ＮＯｘ率との関係を示すグラフで
ある。FIG. 6 is a graph showing the relationship between the NH 3 / NO 2 ratio at 250 ° C., the denitration ratio, and the outlet NO / outlet NOx ratio.
【図７】 ３００℃におけるＮＨ3 ／ＮＯ2 比と脱硝率
および出口ＮＯ／出口ＮＯｘ率との関係を示すグラフで
ある。FIG. 7 is a graph showing the relationship between the NH 3 / NO 2 ratio at 300 ° C., the denitration ratio, and the outlet NO / outlet NOx ratio.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ０１Ｊ 23/72 ＺＡＢ Ｂ０１Ｄ 53/36 ＺＡＢ 35/06 １０２Ｃ (72)発明者 市来 正義 大阪市此花区西九条５丁目３番28号 日立 造船株式会社内 (72)発明者 秋山 正樹 大阪市此花区西九条５丁目３番28号 日立 造船株式会社内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification symbol FI B01J 23/72 ZAB B01D 53/36 ZAB 35/06 102C (72) Inventor Masayoshi Ichiki 5-3-1 Nishikujo, Konohana-ku, Osaka-shi No. 28 Inside Hitachi Zosen Corporation (72) Inventor Masaki Akiyama 5-28 Nishikujo, Konohana-ku, Osaka-shi Inside Hitachi Zosen Corporation
Claims (4)
クロムのうち少なくとも一種の酸化物を担持することを
特徴とする二酸化窒素除去用触媒。A manganese, copper, and titanium oxide carrier.
A catalyst for removing nitrogen dioxide, which carries at least one oxide of chromium.
ォーム体にチタニアコロイドを含浸させ、これを乾燥又
は焼成して得られた板状物であることを特徴とする請求
項１記載の二酸化窒素除去用触媒。2. The carbon dioxide according to claim 1, wherein the titanium oxide carrier is a plate-like material obtained by impregnating a non-combustible fiber preform with a titania colloid and drying or calcining the colloid. Catalyst for removing nitrogen.
の二酸化窒素を還元剤であるＮＨ3 によって１５０〜３
００℃の温度範囲で選択的接触還元に付してＮ2 に変換
する二酸化窒素除去方法。3. Using the catalyst according to claim 1, nitrogen dioxide in exhaust gas is reduced to 150 to 3 by NH 3 as a reducing agent.
A process for removing nitrogen dioxide by subjecting it to selective catalytic reduction in the temperature range of 00 ° C to convert it to N 2 .
後流でバナジウム・タングステン担持チタニア触媒を用
いて、排ガス中の二酸化窒素を還元剤であるＮＨ3 によ
って１５０〜３００℃の温度範囲で選択的接触還元に付
してＮ2 に変換する二酸化窒素除去方法。4. Using the catalyst according to claim 1, and further using a vanadium-tungsten-supported titania catalyst in the subsequent stream, selecting nitrogen dioxide in the exhaust gas with a reducing agent, NH 3 , in a temperature range of 150 to 300 ° C. Nitrogen dioxide removal method of converting to N 2 by subjecting to catalytic reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8274448A JPH10118492A (en) | 1996-10-17 | 1996-10-17 | Catalyst for removing nitrogen dioxide and method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8274448A JPH10118492A (en) | 1996-10-17 | 1996-10-17 | Catalyst for removing nitrogen dioxide and method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10118492A true JPH10118492A (en) | 1998-05-12 |
Family
ID=17541839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8274448A Withdrawn JPH10118492A (en) | 1996-10-17 | 1996-10-17 | Catalyst for removing nitrogen dioxide and method therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10118492A (en) |
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1996
- 1996-10-17 JP JP8274448A patent/JPH10118492A/en not_active Withdrawn
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|---|---|---|---|---|
| US7749938B2 (en) | 2006-11-15 | 2010-07-06 | Mitsubishi Heavy Industries, Ltd. | Catalyst for nitrogen oxide removal and exhaust gas treatment method |
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| US8281572B2 (en) | 2008-04-30 | 2012-10-09 | Cummins Ip, Inc. | Apparatus, system, and method for reducing NOx emissions from an engine system |
| US8225595B2 (en) | 2008-12-05 | 2012-07-24 | Cummins Ip, Inc. | Apparatus, system, and method for estimating an NOx conversion efficiency of a selective catalytic reduction catalyst |
| US8356471B2 (en) | 2008-12-05 | 2013-01-22 | Cummins Ip, Inc. | Apparatus, system, and method for controlling reductant dosing in an SCR catalyst system |
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