JPH0760126A - Catalyst for removal of nitrous oxide in waste gas - Google Patents
Catalyst for removal of nitrous oxide in waste gasInfo
- Publication number
- JPH0760126A JPH0760126A JP5213088A JP21308893A JPH0760126A JP H0760126 A JPH0760126 A JP H0760126A JP 5213088 A JP5213088 A JP 5213088A JP 21308893 A JP21308893 A JP 21308893A JP H0760126 A JPH0760126 A JP H0760126A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- waste gas
- carrier
- removal
- zeolite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は排ガス中の亜酸化窒素の
除去用触媒に係り、特に低温で高活性の排ガス中の亜酸
化窒素除去用触媒に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst for removing nitrous oxide in exhaust gas, and more particularly to a catalyst for removing nitrous oxide in exhaust gas which is highly active at low temperatures.
【０００２】[0002]
【従来の技術】近年、大気中の二酸化炭素（ＣＯ2 ）の
増加に伴なう地球温暖化現象、窒素酸化物（ＮＯｘ）や
硫黄酸化物（ＳＯ2 ）による酸性雨に基づく森林の被害
等、地球レベルでの環境破壊が顕在化し、その対策が人
類の緊急課題となりつつある。これら地球レベルでの環
境破壊の一つとして、オゾン層の破壊があり、フロン、
メタンなどのほかに、亜酸化窒素（Ｎ2 Ｏ）がその原因
物質の一つに上げられている。特に近年は、各種燃焼器
から排出される酸性雨の原因物質であるＮＯｘを低レベ
ルで抑えるため、低温燃焼が行なわれることが多くなっ
ており、その場合にＮ2 Ｏの排出量が増加することが知
られている。2. Description of the Related Art In recent years, a global warming phenomenon accompanied by an increase in carbon dioxide (CO 2 ) in the atmosphere, damage of forests due to acid rain caused by nitrogen oxides (NOx) and sulfur oxides (SO 2 ), etc. , Environmental destruction has become apparent at the global level, and its countermeasures are becoming an urgent task for humankind. One of these environmental destructions at the global level is the destruction of the ozone layer.
Besides methane, nitrous oxide (N 2 O) is listed as one of the causative substances. Particularly in recent years, low-temperature combustion has been frequently performed in order to suppress NOx, which is a causative substance of acid rain discharged from various combustors, at a low level, and in that case, the emission amount of N 2 O increases. It is known.
【０００３】Ｎ2 Ｏの除去用触媒としては高温下で触媒
を用いて熱分解する方法が一般に知られており、亜鉛を
はじめとする各種元素の酸化物を触媒にしたものが研究
されている。これとは別に本発明者らは、モルデナイ
ト、クリノプチライト、ホージャサイトまたはゼオライ
トＹにＦｅまたは水素を置換した触媒でアンモニアによ
りＮ2 Ｏを還元する触媒とそのプロセスを発明し、特許
出願（特公平４−１７０８３号公報）している。この除
去プロセスは、図１に示すように、燃焼器１から排出さ
れたＮ2 Ｏを含有する各種排ガスの流路に設けられた反
応器５中にＮ2 Ｏ除去触媒２が充填され、その上流に排
ガス中にＮＨ36を注入し、温度４００℃以上の温度域で
Ｎ2 Ｏをアンモニア還元するものである。As a catalyst for removing N 2 O, a method of thermally decomposing using a catalyst at a high temperature is generally known, and a catalyst using oxides of various elements such as zinc has been studied. . Separately from this, the present inventors invented a catalyst and its process for reducing N 2 O by ammonia with a catalyst obtained by substituting Fe or hydrogen for mordenite, clinoptite, faujasite or zeolite Y, and applied for a patent (patent Japanese Patent Publication No. 4-17083). In this removal process, as shown in FIG. 1, a reactor 5 provided in a flow path of various exhaust gases containing N 2 O discharged from a combustor 1 is filled with an N 2 O removal catalyst 2, NH 36 is injected upstream into the exhaust gas, and N 2 O is reduced with ammonia in the temperature range of 400 ° C. or higher.
【０００４】[0004]
【発明が解決しようとする課題】上記Ｎ2 Ｏの除去に関
する従来技術のうち、亜鉛等の酸化物を触媒とする熱分
解法は反応温度が高いことと、使用する触媒が排ガス中
のＳＯｘにより劣化するという問題を有していた。これ
に対し、Ｆｅ置換ゼオライトを使用してアンモニアによ
り還元する方法は、亜鉛等の酸化物を触媒とする熱分解
法よりも低温活性に優れている。しかしながら、その低
温活性は十分とはいえず、実際には４５０℃以上の高温
の排ガス温度域でなければ実質的な除去性能は得られ
ず、そのため耐熱性の点で問題を生じ、また、排ガス中
のＳＯｘとゼオライトとの反応による劣化を無視できな
いなどの問題もあった。Among the conventional techniques for removing N 2 O, the thermal decomposition method using an oxide such as zinc as a catalyst has a high reaction temperature and the catalyst used depends on SOx in the exhaust gas. It had a problem of deterioration. On the other hand, the method of using Fe-substituted zeolite for reduction with ammonia is superior in low-temperature activity to the thermal decomposition method using an oxide such as zinc as a catalyst. However, its low-temperature activity is not sufficient, and practically, the removal performance cannot be obtained unless the temperature of the exhaust gas is at a high temperature of 450 ° C. or higher, which causes a problem in heat resistance. There was also a problem that the deterioration due to the reaction between the SOx and the zeolite therein could not be ignored.
【０００５】本発明の目的は、上記従来技術の欠点であ
る耐熱性、ＳＯｘと触媒との反応による劣化を防止し、
より低温度から高いＮ2 Ｏ除去活性を示す排ガス中の亜
酸化窒素除去用触媒を提供することにある。The object of the present invention is to prevent the heat resistance and the deterioration due to the reaction between SOx and the catalyst, which are the drawbacks of the above-mentioned prior art,
It is intended to provide a catalyst for removing nitrous oxide in exhaust gas, which exhibits high N 2 O removing activity from a lower temperature.
【０００６】[0006]
【課題を解決するための手段】上記目的は、担体として
ゼオライトを用いた排ガス中の亜酸化窒素（Ｎ2 Ｏ）の
アンモニア還元による除去用触媒において、担体として
ペンタシル型ゼオライトを用い、これに触媒成分として
鉄（Ｆｅ）を担持したことを特徴とする排ガス中の亜酸
化窒素除去用触媒により達成される。[Means for Solving the Problems] The above-mentioned object is a catalyst for removing nitrous oxide (N 2 O) in exhaust gas by ammonia reduction using zeolite as a carrier, and a pentasil-type zeolite is used as a carrier. This is achieved by a catalyst for removing nitrous oxide in exhaust gas, which is characterized by supporting iron (Fe) as a component.
【０００７】[0007]
【作用】本発明者らの研究によれば、前述した従来触媒
の問題点である低温活性、耐熱性および耐ＳＯｘ性が劣
る点は以下の理由によることが判明した。すなわち、低
温活性が低く、かつ熱により劣化しやすいのは、活性成
分を支持している単体であるゼオライトの熱または脱ア
ルミニウムによる結晶構造の破壊により生じる。さら
に、触媒のＳＯｘによる劣化は、触媒活性成分である金
属酸化物の触媒作用によって排ガス中のＳＯｘの主成分
であるＳＯ2 がＳＯ3 に酸化され、このＳＯ 3 がゼオラ
イトの結晶骨格中に存在するアルミニウムと反応し、比
表面積の低下や細孔の閉塞を引き起こすことによって起
こる。According to the research conducted by the present inventors, the conventional catalyst described above is used.
Of low temperature activity, heat resistance and SOx resistance
It was found that the following points are due to the following reasons. Ie low
Thermal activity is low and it is easy to deteriorate due to heat.
Heat or deallocation of the single zeolite that supports the
It is caused by the destruction of the crystal structure by luminium. Furthermore
In addition, the deterioration of the catalyst due to SOx is caused by the catalyst active component gold.
Main component of SOx in exhaust gas due to catalytic action of metal oxides
Is SO2Is SO3Is oxidized to SO 3Zeora
Reacts with aluminum present in the crystal skeleton
Caused by reduced surface area or blockage of pores
Koru
【０００８】このようなゼオライトの耐熱性、耐ＳＯｘ
性は、ゼオライトの結晶骨格中に存在するアルミニウム
の濃度、すなわち、ゼオライト中のＳｉＯ2 ／Ａｌ2 Ｏ
3 比に大きく依存する。また、特公平４−１７０８３に
あるように、Ｎ2 Ｏ除去には、Ｆｅをモデルナイト、ク
リノプチライト、ホージャサイト及びゼオライトＹとい
った担体に担持した触媒が有効であり、その他の担体、
たとえばＴｉＯ2 、α−アルミナ、シリカアルミナを用
いるとかえってＮ2 Ｏを生成する。このように、担体の
種類、組成等が触媒の活性に大きく影響する。Heat resistance and SOx resistance of such zeolite
The property is the concentration of aluminum present in the crystal skeleton of zeolite, that is, SiO 2 / Al 2 O in zeolite.
3 Depends heavily on the ratio. Further, as disclosed in JP-B-4-17083, for removing N 2 O, a catalyst in which Fe is carried on a carrier such as model night, clinoptite, faujasite and zeolite Y is effective, and other carriers,
For example, TiO 2 , α-alumina, and silica alumina are used instead of N 2 O. Thus, the type and composition of the carrier have a great influence on the activity of the catalyst.
【０００９】以上のような考察をもとに鋭意検討した結
果、本発明者らはペンタシル型ゼオライトを担体とし、
これに活性成分としてＦｅを担持した触媒が、従来の触
媒よりも優れた触媒活性を有することを見出した。本発
明による触媒で担体として用いているペンタシル型ゼイ
ライトは、富永博夫編「ゼオライトの科学と応用」２９
頁に記してあるように、複雑な骨組構造を有するゼオラ
イトで、従来触媒に担体として用いているモルデナイ
ト、クリノプチライト、ホージャサイト及びゼオライト
Ｙと比較して、ＳｉＯ2 ／Ａｌ2 Ｏ3 比が高い。このよ
うな特徴を持つペンタシル型ゼオライトをＦｅと組み合
わせることにより、従来にない耐熱性、耐ＳＯｘ性の高
い高活性な触媒を得ることが可能になる。本発明で使用
可能なゼオライトは、ペンタシル型ゼイライトに総称さ
れるものであればどのようなものでもよいが、一般にＺ
ＳＭ−５と呼ばれているゼオライトで、ＳｉＯ2 ／Ａｌ
2 Ｏ 3 比が２０〜２００、好ましくは２０〜１５０の範
囲のものが好適である。また上記ゼオライトにおけるＦ
ｅ担持方法は、その目的を達成することができればどの
ような方法であってもよく、ゼオライトの骨組構造が保
持された。Ｆｅ担持ゼオライトが得られる限り、本発明
の範囲内である。[0009] Based on the above consideration
As a result, the inventors have used pentasil-type zeolite as a carrier,
A catalyst supporting Fe as an active component on this catalyst is
It was found that it has a catalytic activity superior to that of the medium. Starting
Pentasil-type ze used as a carrier in a catalyst according to Akira
Wright is Hiroo Tominaga's book, "Science and Applications of Zeolites" 29
Zeora with complex skeleton structure, as described on page
Of mordenite, which has been used as a carrier for conventional catalysts.
, Clinoptite, faujasite and zeolite
SiO compared to Y2/ Al2O3The ratio is high. This
A pentasil-type zeolite with such characteristics is combined with Fe.
By making it possible, it has high heat resistance and SOx resistance that have never been seen before.
It becomes possible to obtain a highly active catalyst. Used in the present invention
Possible zeolites are collectively referred to as pentasil-type zeylite.
However, in general, Z
A zeolite called SM-5, SiO2/ Al
2O 3The ratio is in the range of 20 to 200, preferably 20 to 150.
Boxed ones are preferred. In addition, F in the above zeolite
What kind of e-supporting method should be used if it can achieve its purpose?
Such a method may be used, and the framework structure of zeolite is preserved.
Carried As long as an Fe-supporting zeolite can be obtained, the present invention
Within the range of.
【００１０】本発明において、ペンタシル型ゼオライト
を担体とし、これに触媒成分として鉄を担持させるに
は、適当な鉄化合物、例えば硝酸鉄、酢酸鉄などの水溶
液に前記担体を浸漬または含浸させればよい。また本発
明の触媒を用いて排ガス中の亜酸化窒素を除去するに
は、従来と同様に図１のようなフロー図に従って行えば
よい。In the present invention, pentasil-type zeolite is used as a carrier, and iron is supported as a catalyst component on the carrier by immersing or impregnating the carrier in an aqueous solution of a suitable iron compound such as iron nitrate or iron acetate. Good. Further, in order to remove nitrous oxide in exhaust gas using the catalyst of the present invention, it may be performed according to the flow chart as shown in FIG.
【００１１】本発明による触媒は、従来の触媒で担体と
して用いているモルデナイト、クリノプチライト、ゼオ
ライトＹ、およびホージャサイトに比べ、ＳｉＯ2 ／Ａ
ｌ2Ｏ3 比が高いため、従来よりも低温活性に優れ、さ
らに、熱およびＳＯｘによる担体の劣化が見られない。The catalyst according to the invention has a SiO 2 / A content compared to the mordenite, clinoptylite, zeolite Y and faujasite used as carriers in conventional catalysts.
Since the l 2 O 3 ratio is high, the activity at low temperature is superior to that in the past, and further, deterioration of the carrier due to heat and SOx is not observed.
【００１２】[0012]
【実施例】以下、本発明を実施例を用いて詳細に説明す
る。 実施例１ ペンタシル型ゼオライト（ＰＱ社製ＺＳＭ−５、ＳｉＯ
2 ／Ａｌ2 Ｏ3 比＝３０）５０ｇを硝酸鉄III （Ｆｅ2
（ＮＯ3 ）3 ・９Ｈ2 Ｏ）１８ｇを含む水溶液１００ml
中に投入後、砂浴上１５０℃で攪拌しながら蒸発乾固し
た。得られたＦｅ担持ゼオライトを、電気炉中５５０℃
で２時間焼成した。得られた粉末を油圧プレスを用い３
ton／cm2 でペレット状に成形し、さらにこれを破砕し
て１０〜２０メッシュの触媒を得た。 実施例２ 実施例１の硝酸鉄III を酢酸鉄（Ｆｅ（ＯＨ）（ＣＨ3
ＣＯＯ）2 ）８．５ｇに変更して、他は同様にして触媒
を調製した。 実施例３〜５ 実施例１における硝酸鉄III １８ｇを０．６ｇ、６ｇお
よび３６ｇに変更して、他は同様にして触媒を調製し
た。 比較例１ 実施例１のゼオライトをＳｉＯ2 ／Ａｌ2 Ｏ3 比＝２３
のモルデナイト（東ソ製）に替えて、同様にして触媒を
調製した。 比較例２、３ 実施例１の硝酸鉄III を等モルの酢酸銅（Ｃｕ（ＣＨ3
ＣＯＯ）2 ・Ｈ2 Ｏ）および硝酸ニッケル（Ｎｉ（ＮＯ
3 ）2 ・６Ｈ2 Ｏ）に替えて、他は同様にして触媒を調
製した。EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 Pentacyl-type zeolite (ZQ-5, SiO manufactured by PQ Co., Ltd.
50 g of 2 / Al 2 O 3 ratio = 30 was added to iron nitrate III (Fe 2
(NO 3) 3 · 9H 2 O) aqueous solution containing 18 g 100 ml
After pouring it in, it was evaporated to dryness on a sand bath at 150 ° C. with stirring. The obtained Fe-supported zeolite was heated at 550 ° C in an electric furnace.
It was baked for 2 hours. The obtained powder is 3 using a hydraulic press.
It was molded into a pellet at ton / cm 2 and further crushed to obtain a 10 to 20 mesh catalyst. Example 2 The iron nitrate III of Example 1 was mixed with iron acetate (Fe (OH) (CH 3
A catalyst was prepared in the same manner except that the amount of COO) 2 ) was changed to 8.5 g. Examples 3 to 5 Catalysts were prepared in the same manner as in Example 1, except that 18 g of iron nitrate III was changed to 0.6 g, 6 g and 36 g. COMPARATIVE EXAMPLE 1 The zeolite of Example 1 was mixed with SiO 2 / Al 2 O 3 ratio = 23.
In place of the mordenite (manufactured by Toso Co., Ltd.), a catalyst was prepared in the same manner. Comparative Examples 2 and 3 The iron nitrate III of Example 1 was mixed with equimolar copper acetate (Cu (CH 3
COO) 2 · H 2 O) and nickel nitrate (Ni (NO
3) in place of 2 · 6H 2 O), the other A catalyst was prepared in the same manner.
【００１３】実施例１〜６および比較例１〜３の触媒に
対し、表１の条件でＮ2 Ｏ除去率を測定した。 実施例６ 実施例１に用いたゼオライトをＳｉＯ2 ／Ａｌ2 Ｏ3 比
＝８０であるＺＳＭ−５（ＰＱ社製）に替えた以外は実
施例１と同様にして触媒を調整した。The N 2 O removal rates of the catalysts of Examples 1 to 6 and Comparative Examples 1 to 3 were measured under the conditions shown in Table 1. Example 6 A catalyst was prepared in the same manner as in Example 1 except that the zeolite used in Example 1 was replaced with ZSM-5 (manufactured by PQ) having a SiO 2 / Al 2 O 3 ratio = 80.
【００１４】[0014]
【表１】 図２は、実施例１および比較例１の触媒のＮ2 Ｏ除去率
の温度依存性を示したものである。本図から明らかなよ
うに、本発明による触媒は従来の触媒よりも低温度で活
性を示し、反応温度が５０℃以上も低下している。[Table 1] FIG. 2 shows the temperature dependence of the N 2 O removal rate of the catalysts of Example 1 and Comparative Example 1. As is clear from this figure, the catalyst of the present invention exhibits activity at a lower temperature than the conventional catalyst, and the reaction temperature is lowered by 50 ° C. or more.
【００１５】また、表２に実施例１〜６の触媒における
４５０℃でのＮ2 Ｏ除去率を示した。Table 2 shows the N 2 O removal rates at 450 ° C. for the catalysts of Examples 1-6.
【００１６】[0016]
【表２】 本表より、本発明の触媒は鉄原料の種類が変わっても同
様に高活性であり、また、鉄担持量は、０．１ wt ％以
上、好ましくは０．５ wt ％以上必要であることが分か
る。[Table 2] From this table, the catalyst of the present invention is similarly highly active even when the type of iron raw material is changed, and the amount of iron supported is required to be 0.1 wt% or more, preferably 0.5 wt% or more. I understand.
【００１７】さらに、実施例１および比較例２、３の触
媒を用い、表１に示した組成のガス中にＳＯ2 を２００
ppmになるように添加し、４５０℃で３０時間の耐久性
テストを行なった。得られた結果は表３のごとくであ
り、本発明の実施例による触媒は、ＳＯ2 含有ガス中で
の性能変化はほとんど認められず、従来の触媒（比較例
２、３）に較べて耐ＳＯｘ性の極めて優れたものである
ことが分かる。Further, using the catalysts of Example 1 and Comparative Examples 2 and 3, SO 2 of 200 was added to the gas having the composition shown in Table 1.
It was added so as to be ppm, and a durability test was carried out at 450 ° C. for 30 hours. The obtained results are as shown in Table 3, and the catalysts according to the examples of the present invention showed almost no change in performance in the SO 2 -containing gas, and were more resistant than the conventional catalysts (Comparative Examples 2 and 3). It can be seen that the SOx property is extremely excellent.
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【発明の効果】本発明の触媒により、オゾン層の破壊物
質であるＮ2 Ｏの除去を通常燃焼排ガス温度である３５
０〜５００℃において行なうことが可能である。EFFECT OF THE INVENTION The catalyst of the present invention is used to remove N 2 O, which is a depleting substance of the ozone layer, at a normal combustion exhaust gas temperature of 35.
It can be carried out at 0 to 500 ° C.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の触媒を用いてＮ2 Ｏを除去するプロセ
スを示すフロー図。FIG. 1 is a flow chart showing a process of removing N 2 O using the catalyst of the present invention.
【図２】実施例１および比較例１の触媒のＮ2 Ｏ除去活
性の温度依存性を示す図。FIG. 2 is a graph showing the temperature dependence of N 2 O removal activity of the catalysts of Example 1 and Comparative Example 1.
───────────────────────────────────────────────────── 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 20/16 7202−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B01J 20/16 7202-4G
Claims (1)
の亜酸化窒素（Ｎ2Ｏ）のアンモニア還元による除去用
触媒において、担体としてペンタシル型ゼオライトを用
い、これに触媒成分として鉄（Ｆｅ）を担持したことを
特徴とする排ガス中の亜酸化窒素除去用触媒。1. A catalyst for removing nitrous oxide (N 2 O) in exhaust gas by ammonia reduction using zeolite as a carrier, wherein pentasil-type zeolite is used as a carrier, and iron (Fe) is supported as a catalyst component on the catalyst. A catalyst for removing nitrous oxide in exhaust gas, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5213088A JPH0760126A (en) | 1993-08-27 | 1993-08-27 | Catalyst for removal of nitrous oxide in waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5213088A JPH0760126A (en) | 1993-08-27 | 1993-08-27 | Catalyst for removal of nitrous oxide in waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0760126A true JPH0760126A (en) | 1995-03-07 |
Family
ID=16633363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5213088A Pending JPH0760126A (en) | 1993-08-27 | 1993-08-27 | Catalyst for removal of nitrous oxide in waste gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0760126A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007245050A (en) * | 2006-03-17 | 2007-09-27 | Toyota Central Res & Dev Lab Inc | Nitrogen oxide adsorbing material, method for manufacturing the same and method for removing nitrogen oxide by using the same |
| WO2008018388A1 (en) * | 2006-08-07 | 2008-02-14 | Toyota Jidosha Kabushiki Kaisha | Nitrogen oxides adsorber and process for production thereof |
| JP2008508090A (en) * | 2004-07-27 | 2008-03-21 | ロス アラモス ナショナル セキュリティ，エルエルシー | Catalyst and nitrogen oxide reduction method |
| US7462340B2 (en) | 2002-06-13 | 2008-12-09 | Unde Gmbh | Method and device for reducing the NOX and N2O of gases |
| US7501105B2 (en) | 2004-07-29 | 2009-03-10 | N.E. Chemcat Corporation | NOx reduction catalyst having excellent low-temperature characteristics |
| WO2010116062A1 (en) * | 2009-04-10 | 2010-10-14 | Renault S.A.S. | Method for reducing the nitrous oxide in motor vehicle exhaust gases |
-
1993
- 1993-08-27 JP JP5213088A patent/JPH0760126A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7462340B2 (en) | 2002-06-13 | 2008-12-09 | Unde Gmbh | Method and device for reducing the NOX and N2O of gases |
| EP2286897A1 (en) | 2002-06-13 | 2011-02-23 | Uhde GmbH | Device for reducing the NOx and N2O content of gases |
| JP2008508090A (en) * | 2004-07-27 | 2008-03-21 | ロス アラモス ナショナル セキュリティ，エルエルシー | Catalyst and nitrogen oxide reduction method |
| US7501105B2 (en) | 2004-07-29 | 2009-03-10 | N.E. Chemcat Corporation | NOx reduction catalyst having excellent low-temperature characteristics |
| JP2007245050A (en) * | 2006-03-17 | 2007-09-27 | Toyota Central Res & Dev Lab Inc | Nitrogen oxide adsorbing material, method for manufacturing the same and method for removing nitrogen oxide by using the same |
| WO2008018388A1 (en) * | 2006-08-07 | 2008-02-14 | Toyota Jidosha Kabushiki Kaisha | Nitrogen oxides adsorber and process for production thereof |
| WO2010116062A1 (en) * | 2009-04-10 | 2010-10-14 | Renault S.A.S. | Method for reducing the nitrous oxide in motor vehicle exhaust gases |
| FR2944316A3 (en) * | 2009-04-10 | 2010-10-15 | Renault Sas | METHOD OF REDUCING NITROGEN PROTOXIDE FROM EXHAUST GAS OF MOTOR VEHICLE |
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