JPH07171401A - Catalyst for treatment of exhaust gas - Google Patents
Catalyst for treatment of exhaust gasInfo
- Publication number
- JPH07171401A JPH07171401A JP6006930A JP693094A JPH07171401A JP H07171401 A JPH07171401 A JP H07171401A JP 6006930 A JP6006930 A JP 6006930A JP 693094 A JP693094 A JP 693094A JP H07171401 A JPH07171401 A JP H07171401A
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- JP
- Japan
- Prior art keywords
- catalyst
- chloride
- exhaust gas
- crystalline silicate
- silicate
- 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.)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は窒素酸化物(以下、NO
xと略す)、一酸化炭素(CO)、炭化水素(以下、H
Cと略す)を含有する排気ガスを処理する触媒に関す
る。The present invention relates to nitrogen oxides (hereinafter referred to as NO
abbreviated as x), carbon monoxide (CO), hydrocarbon (hereinafter, H)
A catalyst for treating exhaust gas containing C).
【0002】[0002]
【従来の技術】自動車等の排ガス処理においては、排ガ
ス中のCO、HCを利用して理論空燃比付近の極めて狭
い範囲でNOxを浄化しているのが一般的である。近
年、地球環境問題の高まりの中で自動車の低燃費化の要
求は強く理論空燃比以上で燃焼させるリーンバーンエン
ジンがキーテクノロジーとして注目されている。ただ
し、自動車の走行性、加速性を考慮に入れるとリーン領
域のみのエンジンは不具合点が多く、実際は理論空燃比
(ストイキオ)付近、リーン領域の双方で燃焼を行わせ
る必要がある。最近、リーン領域でNOxの浄化に関し
てはコバルト又は銅を含有した結晶性シリケート触媒が
高性能を有する触媒として脚光をあびている。2. Description of the Related Art In the treatment of exhaust gas from automobiles, it is general to purify NOx in an extremely narrow range near the stoichiometric air-fuel ratio by utilizing CO and HC in the exhaust gas. In recent years, the demand for low fuel consumption of automobiles has been strongly demanded due to the increase of global environmental problems, and a lean burn engine that burns at a ratio higher than the theoretical air-fuel ratio has been attracting attention as a key technology. However, considering the driving and acceleration characteristics of the automobile, there are many problems with the engine only in the lean region, and it is necessary to actually perform combustion both in the vicinity of the stoichiometric air-fuel ratio (Stoichio) and in the lean region. Recently, regarding purification of NOx in the lean region, a crystalline silicate catalyst containing cobalt or copper has been highlighted as a catalyst having high performance.
【0003】これらの触媒は反応初期においては十分な
性能を有するが、耐久性において問題点が生じており、
これまで耐久性を向上させるために種々の結晶性シリケ
ートの改良が検討されている。例えば、結晶性シリケー
トの主要な構成元素であるアルミニウムの脱離を防い
で、コバルト又は銅の安定性を図るために結晶格子中に
VIII族元素や希土類元素(特願平3−165816号公
報)、さらにアルカリ土類金属(特願平3−31919
5号)を添加させた新規なシリケートを用いる方法が提
案されている。加えて、アルミニウムの脱離を促進する
スチームの進入を防ぐため、結晶性シリケートの表層に
疎水性のシリカライトを結晶成長させ、耐スチーム性を
向上させた結晶性シリケートの適用も検討されている
(特願平3−192829号)。These catalysts have sufficient performance in the initial stage of the reaction, but have problems in durability,
Up to now, various crystalline silicates have been studied for improvement in order to improve durability. For example, in order to prevent the elimination of aluminum, which is the main constituent element of crystalline silicate, and to stabilize cobalt or copper, the
Group VIII elements and rare earth elements (Japanese Patent Application No. 3-165816), and alkaline earth metals (Japanese Patent Application No. 3-31919).
No. 5) has been proposed to use a novel silicate. In addition, in order to prevent the invasion of steam that promotes the desorption of aluminum, the application of a crystalline silicate in which the hydrophobic silicalite is crystal-grown on the surface layer of the crystalline silicate to improve the steam resistance is being studied. (Japanese Patent Application No. 3-192829).
【0004】しかし、これらの触媒を用いることにより
リーン雰囲気での耐久性は飛躍的に向上したが、加速す
る場合、ガス温度が瞬時に高温になりかつ、この時のガ
ス組成は水素等の還元剤が過剰に存在するリッチ雰囲気
である。この条件においては、上記改良型結晶性シリケ
ートを適用しても触媒の劣化を防ぐことができないた
め、高温リッチ雰囲気の触媒の耐久性向上がこれらの触
媒の実用化上の大きな課題となっている。However, although the durability in a lean atmosphere is dramatically improved by using these catalysts, the gas temperature instantly rises to a high temperature when accelerated, and the gas composition at this time is reduced by hydrogen or the like. It is a rich atmosphere in which the agent is present in excess. Under these conditions, even if the improved crystalline silicate is applied, deterioration of the catalyst cannot be prevented. Therefore, improvement of durability of the catalyst in a high temperature rich atmosphere is a major problem in practical application of these catalysts. .
【0005】[0005]
【発明が解決しようとする課題】上記問題点は銅やコバ
ルトを活性金属として用いる限りは避けられない。すな
わち、リッチ雰囲気の高温では卑金属元素は全てシンタ
リングを起こし凝集してしまうからである。そのため、
開発した結晶性シリケートを用いてリーン雰囲気で脱硝
活性を有する卑金属以外の金属を用いることができれ
ば、耐久性は十分保証され、実用化へ大きく前進すると
考えられる。The above problems are unavoidable as long as copper or cobalt is used as the active metal. That is, at high temperature in a rich atmosphere, all base metal elements cause sintering and aggregate. for that reason,
If the developed crystalline silicate can be used with a metal other than a base metal having a denitration activity in a lean atmosphere, the durability is sufficiently ensured, and it is considered that the practical use will be greatly advanced.
【0006】[0006]
【課題を解決するための手段】そこで、本発明者らは従
来触媒の不具合点を克服するため鋭意検討を行った結
果、イリジウム元素を担持した結晶性シリケート触媒が
リーン雰囲気において脱硝性能を有し、かつ、高温雰囲
気でもほとんど劣化しない触媒であることを見い出し、
この知見に基づいて本発明を完成するに至った。The inventors of the present invention have conducted extensive studies to overcome the drawbacks of conventional catalysts, and as a result, a crystalline silicate catalyst carrying an iridium element has denitration performance in a lean atmosphere. And, it was found that the catalyst hardly deteriorates even in a high temperature atmosphere,
The present invention has been completed based on this finding.
【0007】すなわち、本発明は下記に示す表Aに示さ
れるX線回折パターンを有し、脱水された状態において
酸化物のモル比で表わして (1±0.4)R2 O・〔aBi2 O3 ・bLa2 O3
・cCe2 O3 ・dM2O3 〕・ySiO2 (上記式中、R:Na及び/又はHイオン、M:1種又
はそれ以上のVIII族金属イオン、チタン、バナジウム、
クロム、ニオブ、アンチモン及びアルミニウムよりなる
群から選ばれたイオン、a+b+c+d=1、a≧0、
b≧0、c≧0、d≧0、a+b+c>0、y≧12)
なる化学式を有する結晶性シリケートにイリジウムを担
持させてなることを特徴とする排気ガス処理用触媒であ
る。That is, the present invention has an X-ray diffraction pattern shown in Table A below and represents (1 ± 0.4) R 2 O. [aBi as the molar ratio of oxides in the dehydrated state. 2 O 3 / bLa 2 O 3
· CCe 2 O 3 · dM 2 O 3 ] · ySiO 2 (in the above formula, R: Na and / or H ions, M: 1 or more Group VIII metal ions, titanium, vanadium,
An ion selected from the group consisting of chromium, niobium, antimony and aluminum, a + b + c + d = 1, a ≧ 0,
b ≧ 0, c ≧ 0, d ≧ 0, a + b + c> 0, y ≧ 12)
An exhaust gas treatment catalyst, characterized in that iridium is supported on a crystalline silicate having the following chemical formula.
【0008】[0008]
【表1】 VS:非常に強い S:強い M:中級 W:弱い X線源:Cu Kα[Table 1] VS: Very strong S: Strong M: Intermediate W: Weak X-ray source: Cu Kα
【0009】上記結晶性シリケートは特公昭62−43
27号公報、特公平2−49245号公報にて本発明者
らが既に特定したものであり、規制正しい多孔性の結晶
性シリケートの合成が可能であり、さらにメタノールの
転換反応等の種々の反応に高活性、長寿命を有する特徴
をもつものである。The above-mentioned crystalline silicate is disclosed in JP-B-62-43.
No. 27, Japanese Patent Publication No. 2-49245, the present inventors have already specified, and it is possible to synthesize a crystalline silicate having a regulated porosity, and further various reactions such as a conversion reaction of methanol. It has the characteristics of high activity and long life.
【0010】[0010]
【作用】通常、イリジウムを担持した本発明で使用する
結晶性シリケートを用いて、NOx、CO、HCを含有
する排気ガスを浄化する浄化反応式は下記のとおりであ
る。The purifying reaction formula for purifying exhaust gas containing NOx, CO, and HC using the crystalline silicate used in the present invention carrying iridium is as follows.
【0011】[0011]
【化1】 *1)炭化水素(HC)の例としてC3 H6 を代表とし
て示した。 *2)含酸素炭化水素の例としてCH2 Oを代表として
示した。 上記反応式において、(1)はHCの活性化、(2)は
HCの燃焼、(3)は脱硝反応、(4)はCOの燃焼を
意味している。[Chemical 1] * 1) As an example of hydrocarbon (HC), C 3 H 6 is shown as a representative. * 2) CH 2 O is shown as an example of the oxygen-containing hydrocarbon. In the above reaction formula, (1) means activation of HC, (2) means combustion of HC, (3) means denitration reaction, and (4) means combustion of CO.
【0012】イリジウムを担持した結晶性シリケート触
媒は250〜500℃において高い脱硝性能を有する。
上記触媒は、700℃以上の高温リーン又はリッチ雰囲
気に長時間さらされても上記k1 ,k2 ,k3 及びk4
の反応速度定数はほとんど変化せず、耐久性を有する触
媒であることを見い出している。本発明で使用する結晶
性シリケート上において、イリジウム元素の分散性がい
かなる条件においても均一に保持されており、シンタリ
ング等の現象は認められない。The crystalline silicate catalyst supporting iridium has a high denitration performance at 250 to 500 ° C.
Even if the catalyst is exposed to a high temperature lean atmosphere of 700 ° C. or higher or a rich atmosphere for a long time, the above k 1 , k 2 , k 3 and k 4
It has been found that the reaction rate constant of is almost unchanged and the catalyst has durability. On the crystalline silicate used in the present invention, the dispersibility of the iridium element is uniformly maintained under any condition, and no phenomenon such as sintering is observed.
【0013】本発明触媒は上記結晶性シリケートにイリ
ジウム元素の金属塩の水溶液に浸漬し、イオン交換法又
は含浸法にて担持する方法があげられる。担持するイリ
ジウム元素は0.002wt%以上で十分に活性を発現
し、好ましくは0.02wt%以上で高い活性を有す
る。以後、本発明を実施例にて詳述する。The catalyst of the present invention may be obtained by immersing the above-mentioned crystalline silicate in an aqueous solution of a metal salt of an iridium element and carrying it by an ion exchange method or an impregnation method. The iridium element to be carried exhibits a sufficient activity at 0.002 wt% or more, and preferably has a high activity at 0.02 wt% or more. Hereinafter, the present invention will be described in detail with reference to Examples.
【0014】[0014]
(実施例1) 〇 結晶性シリケート1の合成 水ガラス1号(SiO2 :30%):5616gを水:
5429gに溶解し、この溶液を溶液Aとする。一方、
水:4175gに塩化ビスマス:157.6g、塩化ナ
トリウム:262g、濃塩酸:2020gを溶解し、こ
の溶液を溶液Bとする。溶液Aと溶液Bを一定割合で供
給し、沈殿を生成させ、十分攪拌してpH=8.0のス
ラリを得る。このスラリを20リットルのオートクレー
ブに仕込み、さらにテトラプロピルアンモニウムブロマ
イドを500g添加し、160℃にて72時間水熱合成
を行い、合成後水洗して乾燥させ、さらに500℃、3
時間焼成させ結晶性シリケート1を得る。この結晶性シ
リケート1は酸化物のモル比で(結晶水を省く)下記の
組成式で表され、結晶構造はX線回折で前記表Aにて表
示されるものである。 0.5Na2 O・0.5H2 O(Bi2 O3 )・56S
iO2 上記結晶性シリケート1を4NのNH4 Cl水溶液40
℃に3時間攪拌してNH4 イオン交換を実施した。イオ
ン交換後洗浄して100℃、24時間乾燥させた後、4
00℃、3時間焼成してH型の結晶性シリケート1を得
た。Example 1 Synthesis of Crystalline Silicate 1 Water glass No. 1 (SiO 2 : 30%): 5616 g of water:
It is dissolved in 5429 g, and this solution is referred to as solution A. on the other hand,
Bismuth chloride: 157.6 g, sodium chloride: 262 g, and concentrated hydrochloric acid: 2020 g are dissolved in water: 4175 g, and this solution is referred to as solution B. Solution A and solution B are supplied at a constant ratio to form a precipitate, which is sufficiently stirred to obtain a slurry having a pH of 8.0. This slurry was charged into a 20 liter autoclave, 500 g of tetrapropylammonium bromide was further added, and hydrothermal synthesis was carried out at 160 ° C. for 72 hours, followed by washing with water and drying.
The crystalline silicate 1 is obtained by firing for a time. This crystalline silicate 1 is represented by the following composition formula in terms of the molar ratio of oxides (excluding the water of crystallization), and the crystal structure is represented by the above-mentioned Table A by X-ray diffraction. 0.5Na 2 O ・ 0.5H 2 O (Bi 2 O 3 ) ・ 56S
iO 2 The above crystalline silicate 1 was added with a 4N NH 4 Cl aqueous solution 40
NH 4 ion exchange was carried out by stirring at ℃ for 3 hours. After washing after ion exchange and drying at 100 ° C for 24 hours, 4
H-type crystalline silicate 1 was obtained by baking at 00 ° C. for 3 hours.
【0015】〇 触媒化 次に、上記100部のH型の結晶性シリケート1に対し
て、バインダとしてアルミナゾル:3部、シリカゾル:
55部(SiO2 :20%)及び水:200部加え、充
分攪拌を行いウォッシュコート用スラリとした。次にコ
ージェライト用モノリス基材(400セルの格子目)を
上記スラリに浸漬し、取り出した後余分なスラリを吹き
はらい200℃で乾燥させた。コート量は基材1リット
ルあたり200g担持し、このコート物をハニカムコー
ト物1とする。次に、塩化イリジウム(IrCl4 ・H
2 O:2.88g/H2 O:200cc)に上記ハニカ
ムコート物1を浸漬し1時間含浸した後、基材の壁の付
着した液をふきとり200℃で乾燥させた。次いで50
0℃で窒素雰囲気で12時間パージ処理を行い、ハニカ
ム触媒1を得た。このハニカム触媒1の性状を後記表B
に示す。Catalysis Next, to 100 parts of the above H-type crystalline silicate 1, alumina sol as a binder: 3 parts, silica sol:
55 parts (SiO 2 : 20%) and 200 parts of water were added and sufficiently stirred to obtain a washcoat slurry. Next, the monolith substrate for cordierite (lattice of 400 cells) was immersed in the slurry, taken out, and then excess slurry was blown off and dried at 200 ° C. The coated amount is 200 g per liter of the substrate, and this coated product is referred to as honeycomb coated product 1. Next, iridium chloride (IrCl 4 · H
2 O: 2.88 g / H 2 O: 200 cc) was dipped in the above honeycomb coated article 1 and impregnated for 1 hour, and then the liquid adhering to the wall of the substrate was wiped off and dried at 200 ° C. Then 50
Purge treatment was performed at 0 ° C. in a nitrogen atmosphere for 12 hours to obtain a honeycomb catalyst 1. The properties of this honeycomb catalyst 1 are shown in Table B below.
Shown in.
【0016】(実施例2)実施例1の結晶性シリケート
1の合成法において塩化ビスマスの代わりに塩化ランタ
ン又は塩化セリウムを各々酸化物換算でBi2 O3 と同
じモル数だけ添加した以外は結晶性シリケート1と同様
の操作を繰り返して結晶性シリケート2,3を得た。ま
た、結晶性シリケート1において塩化ビスマスの代わり
に塩化ビスマスと塩化ランタン、塩化ランタンと塩化セ
リウム、塩化ランタンと塩化アルミニウムを各々酸化物
換算で等モル数添加した以外は結晶性シリケート1と同
様の操作を繰り返して結晶性シリケート4,5,6を得
た。(Example 2) A crystal except that lanthanum chloride or cerium chloride was added instead of bismuth chloride in the same mole number as Bi 2 O 3 instead of bismuth chloride in the method of synthesizing the crystalline silicate 1 of Example 1. The same operations as those for the crystalline silicate 1 were repeated to obtain crystalline silicates 2 and 3. Also, in the crystalline silicate 1, the same operation as in the crystalline silicate 1 except that bismuth chloride and lanthanum chloride, lanthanum chloride and cerium chloride, and lanthanum chloride and aluminum chloride are added in an equimolar amount instead of bismuth chloride. Was repeated to obtain crystalline silicates 4, 5, and 6.
【0017】上記結晶性シリケート2〜6を用いて実施
例1と同様の方法でH型の結晶性シリケート2〜6を
得、このシリケートをさらに実施例1の触媒の調製と同
様の工程にてコージェライトモノリス基材にコートして
ハニカムコート物2〜6を得た。次に塩化イリジウム水
溶液に浸漬し実施例1と同様の処理にてハニカム触媒2
〜6を得た。これらハニカム触媒2〜6の性状を後記表
Bに併せて示す。Using the above crystalline silicates 2 to 6, H type crystalline silicates 2 to 6 were obtained in the same manner as in Example 1, and the silicates were further processed in the same steps as in the preparation of the catalyst of Example 1. A cordierite monolith substrate was coated to obtain honeycomb coated products 2 to 6. Next, the honeycomb catalyst 2 was immersed in an aqueous solution of iridium chloride and treated in the same manner as in Example 1.
~ 6 was obtained. Properties of these honeycomb catalysts 2 to 6 are also shown in Table B below.
【0018】(実施例3)実施例1で示すNH4 イオン
変換操作を省略した実施例1,2で用いる結晶性シリケ
ート1〜6を実施例1の触媒調整と同様の工程にてハニ
カムコート物及びハニカム触媒7〜12を得た。(Example 3) The crystalline silicates 1 to 6 used in Examples 1 and 2 in which the NH 4 ion conversion operation shown in Example 1 was omitted were treated in the same manner as in Example 1 to prepare a honeycomb-coated product. And the honeycomb catalysts 7-12 were obtained.
【0019】(実施例4)実施例1の結晶性シリケート
1の合成法において塩化ビスマスの代わりに塩化ビスマ
スと塩化第2鉄、塩化ビスマスと塩化コバルト、塩化ビ
スマスと塩化ルテニウム、塩化ビスマスと塩化ロジウ
ム、塩化ビスマスと塩化チタン、塩化ビスマスと塩化バ
ナジウム、塩化ビスマスと塩化クロム、塩化ビスマスと
塩化アンチモン、塩化ビスマスと塩化ニオブ、塩化ビス
マスと塩化ガリウム及び塩化ビスマスと塩化ランタンと
塩化セリウムと塩化アルミニウムを各々酸化物換算で等
モル数添加した以外は結晶性シリケート1と同様の操作
を行い結晶性シリケート13〜23を得た。(Example 4) In the method for synthesizing the crystalline silicate 1 of Example 1, bismuth chloride and ferric chloride, bismuth chloride and cobalt chloride, bismuth chloride and ruthenium chloride, bismuth chloride and rhodium chloride were used instead of bismuth chloride. , Bismuth chloride and titanium chloride, bismuth chloride and vanadium chloride, bismuth chloride and chromium chloride, bismuth chloride and antimony chloride, bismuth chloride and niobium chloride, bismuth chloride and gallium chloride, bismuth chloride and lanthanum chloride, cerium chloride and aluminum chloride, respectively. The same operations as in the crystalline silicate 1 were performed except that the equimolar number was added in terms of oxide to obtain crystalline silicates 13 to 23.
【0020】上記結晶性シリケート13〜23を用いて
実施例1と同様の方法でH型の結晶性シリケート13〜
23を得、このシリケートをさらに実施例1の触媒の調
製と同様の工程にてコージェライトモノリス基材にコー
トしてハニカムコート物13〜23を得た。次に塩化イ
リジウム水溶液に浸漬し、実施例1と同様の処理にてハ
ニカム触媒13〜23を得た。これらハニカム触媒13
〜23の性状を下記表Bに示す。Using the above crystalline silicates 13 to 23, the H-type crystalline silicates 13 to 23 were produced in the same manner as in Example 1.
No. 23 was obtained, and this silicate was further coated on the cordierite monolith substrate by the same steps as in the preparation of the catalyst of Example 1 to obtain honeycomb coated products 13 to 23. Next, the honeycomb catalyst was immersed in an aqueous solution of iridium chloride and treated in the same manner as in Example 1 to obtain honeycomb catalysts 13 to 23. These honeycomb catalysts 13
The properties of Nos. 23 to 23 are shown in Table B below.
【0021】[0021]
【表2】 [Table 2]
【0022】[0022]
【表3】 [Table 3]
【0023】(実施例1)実施例1、2、3及び4にて
調製したハニカム触媒1〜23の活性評価試験を実施し
た。活性評価条件は下記のとおりである。 〇(ガス組成) NO:500ppm、CO:1000ppm、C
2 H4 :1500ppm、O 2 :8%、CO2 :10
%、H2 O:10%、残:N2 、GHSV 30000
h-1、触媒形状:15mm×15mm×60mm(14
4セル数) 反応温度350、450℃における初期状態の触媒の脱
硝率を後記表Cに示す。(Example 1) In Examples 1, 2, 3 and 4.
Conducted an activity evaluation test of the prepared honeycomb catalysts 1 to 23
It was The activity evaluation conditions are as follows. 〇 (gas composition) NO: 500ppm, CO: 1000ppm, C
2HFour: 1500ppm, O 2: 8%, CO2: 10
%, H2O: 10%, balance: N2, GHSV 30000
h-1, Catalyst shape: 15 mm × 15 mm × 60 mm (14
4 cells) Desorption of catalyst in the initial state at reaction temperatures of 350 and 450 ° C
The glass ratio is shown in Table C below.
【0024】(実験例2)ハニカム触媒1〜23をリッ
チ雰囲気(還元雰囲気)で強制劣化試験を実施した。強
制劣化試験は下記のとおりである。 〇(ガス組成) H2 :5%、H2 O:10%、残:N2 GHSV:5000h-1、温度:750℃、ガス供給時
間:6時間 触媒形状:15mm×15mm×60mm(144セ
ル) 上記強制劣化条件にて処理した触媒1〜23を実験例1
の活性評価条件において活性評価試験を実施した。反応
温度350、450℃における強制劣化試験後の触媒の
脱硝率を下記表Cに併せて示す。表Cに示すように本発
明触媒1〜23は高温還元雰囲気においても触媒の活性
を高く維持することを確認した。Experimental Example 2 The honeycomb catalysts 1 to 23 were subjected to a forced deterioration test in a rich atmosphere (reducing atmosphere). The forced deterioration test is as follows. 〇 (Gas composition) H 2 : 5%, H 2 O: 10%, balance: N 2 GHSV: 5000 h −1 , temperature: 750 ° C., gas supply time: 6 hours Catalyst shape: 15 mm × 15 mm × 60 mm (144 cells ) Experimental example 1 was prepared using catalysts 1 to 23 treated under the above-mentioned forced deterioration condition.
The activity evaluation test was carried out under the activity evaluation conditions of. The denitration rate of the catalyst after the forced deterioration test at reaction temperatures of 350 and 450 ° C. is also shown in Table C below. As shown in Table C, it was confirmed that the catalysts 1 to 23 of the present invention maintain high catalyst activity even in a high temperature reducing atmosphere.
【0025】[0025]
【表4】 [Table 4]
【0026】[0026]
【表5】 [Table 5]
【0027】[0027]
【発明の効果】以上、説明したように、本発明による排
気ガス浄化用触媒は耐久性に富む安定な触媒であること
を可能にし、ガソリン車のリーンバーンエンジン排ガス
用やディーゼルエンジン排ガス浄化用触媒として利用が
可能である。As described above, the exhaust gas purifying catalyst according to the present invention can be a durable and stable catalyst, and can be used for lean burn engine exhaust gas of gasoline vehicles and diesel engine exhaust gas purifying catalyst. Can be used as
Claims (1)
パターンを有し、脱水された状態において酸化物のモル
比で表わして (1±0.4)R2 O・〔aBi2 O3 ・bLa2 O3
・cCe2 O3 ・dM2O3 〕・ySiO2 (上記式中、R:Na及び/又はHイオン、M:1種又
はそれ以上のVIII族金属イオン、チタン、バナジウム、
クロム、ニオブ、アンチモン及びアルミニウムよりなる
群から選ばれたイオン、a+b+c+d=1、a≧0、
b≧0、c≧0、d≧0、a+b+c>0、y≧12)
なる化学式を有する結晶性シリケートにイリジウムを担
持させてなることを特徴とする排気ガス処理用触媒。1. An X-ray diffraction pattern shown in Table A, which is described in detail in the present text, and expressed as a molar ratio of oxides in a dehydrated state is (1 ± 0.4) R 2 O. [aBi 2 O 3 · bLa 2 O 3
· CCe 2 O 3 · dM 2 O 3 ] · ySiO 2 (in the above formula, R: Na and / or H ions, M: 1 or more Group VIII metal ions, titanium, vanadium,
An ion selected from the group consisting of chromium, niobium, antimony and aluminum, a + b + c + d = 1, a ≧ 0,
b ≧ 0, c ≧ 0, d ≧ 0, a + b + c> 0, y ≧ 12)
An exhaust gas treatment catalyst, comprising iridium supported on a crystalline silicate having the following chemical formula.
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JP26609593 | 1993-10-25 | ||
JP5-266095 | 1993-10-25 | ||
JP00693094A JP3310755B2 (en) | 1993-10-25 | 1994-01-26 | Exhaust gas treatment catalyst |
Publications (2)
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JPH07171401A true JPH07171401A (en) | 1995-07-11 |
JP3310755B2 JP3310755B2 (en) | 2002-08-05 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010194437A (en) * | 2009-02-24 | 2010-09-09 | Mitsubishi Chemicals Corp | Catalyst for cleaning exhaust gas |
-
1994
- 1994-01-26 JP JP00693094A patent/JP3310755B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010194437A (en) * | 2009-02-24 | 2010-09-09 | Mitsubishi Chemicals Corp | Catalyst for cleaning exhaust gas |
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