JPH06262089A - Catalyst for exhaust gas purification - Google Patents
Catalyst for exhaust gas purificationInfo
- Publication number
- JPH06262089A JPH06262089A JP5050869A JP5086993A JPH06262089A JP H06262089 A JPH06262089 A JP H06262089A JP 5050869 A JP5050869 A JP 5050869A JP 5086993 A JP5086993 A JP 5086993A JP H06262089 A JPH06262089 A JP H06262089A
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- exhaust gas
- coat layer
- gas purification
- ion
- 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
- 239000003054 catalyst Substances 0.000 title claims abstract description 38
- 238000000746 purification Methods 0.000 title abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 16
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 15
- 239000010457 zeolite Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 14
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 11
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims description 5
- 239000011147 inorganic material Substances 0.000 claims description 5
- 238000005342 ion exchange Methods 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 17
- 239000010970 precious metal Substances 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 3
- 239000010410 layer Substances 0.000 description 21
- 239000010949 copper Substances 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 2
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229910001657 ferrierite group Inorganic materials 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車などの内燃機関
から排出される排気ガス浄化用触媒に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst for purifying exhaust gas discharged from an internal combustion engine such as an automobile.
【０００２】[0002]
【従来の技術】従来のゼオライトを用いる排気ガス浄化
用触媒としては、例えば特開平１−１２７０４４号公報
に開示されているようなものがある。この触媒では、触
媒の構成としてハニカム担体にＣｕをイオン交換したゼ
オライト層をコーティングしたことにより、排気ガス中
の酸素濃度が理論値より大きくなった状態（リーン・バ
ーン雰囲気）において排気中の窒素酸化物（ＮＯX ）を
還元除去しリーン・バーン雰囲気でも効率よくＮＯX を
浄化している。2. Description of the Related Art As a conventional exhaust gas purifying catalyst using zeolite, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. 1-127044. In this catalyst, the honeycomb carrier is coated with a zeolite layer in which Cu is ion-exchanged as the structure of the catalyst, so that the nitrogen oxidation in the exhaust gas is performed in a state where the oxygen concentration in the exhaust gas is higher than the theoretical value (lean burn atmosphere) The substance (NO x ) is reduced and removed, and the NO x is efficiently purified even in a lean burn atmosphere.
【０００３】[0003]
【発明が解決しようとする課題】しかし、ただ単にハニ
カム担体にＣｕをイオン交換したゼオライトをコーティ
ングした触媒では、リーン・バーン雰囲気でのＮＯX が
還元除去される温度が比較的高温であり、実際の車両の
走行モードで使用される温度領域では充分なＮＯ X 浄化
活性が得られない。また、内層に貴金属成分を含む無機
物を用いて酸化触媒層をコーティングした触媒は、耐久
後の性能が内層を持たない触媒よりも劣化し、充分な浄
化活性が得られない。本発明の目的は、このような従来
の触媒に対して、リーンバーン雰囲気下のより低い温度
領域からＮＯX を還元除去し、耐久後にも充分な浄化活
性を有する排ガス浄化用触媒を提供することにある。[Problems to be Solved by the Invention]
Coated with zeolite with ion exchanged Cu for cam carrier
NO in a lean burn atmosphere with burnt catalystXBut
The temperature of reduction and removal is relatively high, and
Sufficient NO in the temperature range used in running mode Xpurification
No activity is obtained. In addition, the inner layer contains an inorganic material containing a precious metal component.
A catalyst coated with an oxidation catalyst layer is durable
The performance afterwards deteriorates more than the catalyst without the inner layer,
Chemical activity cannot be obtained. The purpose of the present invention is
Lower temperature in lean-burn atmosphere for other catalysts
NO from areaXIs reduced and removed, and sufficient purification activity is achieved even after endurance.
To provide a catalyst for purifying exhaust gas having properties.
【０００４】[0004]
【課題を解決するための手段】本発明の排気ガス浄化用
触媒は、ハニカム担体上に、酸化セリウムと活性アルミ
ナを主成分とし貴金属成分を含まない無機物から成る第
１コート層と、このコート層上の金属、例えばＣｕ又は
Ｃｏをイオン交換したゼオライト粉末を主成分とする無
機物から成る第２コート層とを備えてなることを特徴と
する。The exhaust gas purifying catalyst of the present invention comprises, on a honeycomb carrier, a first coat layer made of an inorganic substance containing cerium oxide and activated alumina as main components and containing no precious metal component, and this coat layer. It is characterized by comprising a second coat layer made of an inorganic material whose main component is a zeolite powder ion-exchanged with the above metal, for example, Cu or Co.
【０００５】[0005]
【作用】本発明の排気ガス浄化用触媒において、酸化セ
リウムを主成分とした無機物をコーティングした第１コ
ート層の触媒層は、酸素が多量に含まれるエンジン排気
ガスのリーン領域において低い温度から酸化触媒反応を
起こし反応熱を発生する。この第１コート層の上にコー
ティングしたＣｕまたはＣｏをイオン交換したゼオライ
ト粉末を主成分とする第２コート層は、酸素が多量に含
まれるエンジン排気ガスのリーン領域においてＮＯX の
転化性能を有している。しかし、この触媒層が高い触媒
反応を示すのは３５０℃以上の温度領域である。本発明
においては、第１コート層の触媒層において酸化反応に
よる反応熱が発生し、その熱が第２コート層の触媒層に
伝わり温度を上昇させることにより、３５０℃以下の低
い温度領域でも高いＮＯX 浄化活性を示し、実際の走行
モードで使用される温度領域で高いＮＯX 浄化活性を有
している。In the exhaust gas purifying catalyst of the present invention, the catalyst layer of the first coat layer coated with the inorganic substance containing cerium oxide as a main component is oxidized from a low temperature in a lean region of engine exhaust gas containing a large amount of oxygen. It causes a catalytic reaction to generate reaction heat. The second coating layer the coated Cu or Co on the first coating layer composed mainly of zeolite powder ion exchange, have a NO X conversion performance in the lean region of the engine exhaust gas oxygen is contained in a large amount is doing. However, this catalyst layer shows a high catalytic reaction in the temperature range of 350 ° C. or higher. In the present invention, the reaction heat due to the oxidation reaction is generated in the catalyst layer of the first coat layer, and the heat is transferred to the catalyst layer of the second coat layer to increase the temperature, so that the temperature is high even in a low temperature range of 350 ° C. or lower. shows the NO X purification activity, has a high NO X purification activity in the temperature range used in the actual running mode.
【０００６】また、貴金属成分を第１コート層に含む場
合には、第１コート層での触媒反応が促進され反応熱に
よる発熱が過大になり、第２コート層の触媒劣化の進行
が進むため、貴金属成分を含まない触媒組成とすること
が必要である。When the noble metal component is contained in the first coat layer, the catalytic reaction in the first coat layer is promoted and the heat generated by the reaction heat becomes excessive, so that the deterioration of the catalyst in the second coat layer progresses. It is necessary to have a catalyst composition containing no precious metal component.
【０００７】[0007]
【実施例】以下本発明を実施例、比較例および試験例に
より説明する。 実施例１ γ−アルミナを主たる成分とする活性アルミナ粉末１０
００ｇ、酸化セリウム１０００ｇ、１０重量％ＨＮＯ3
４００ｇおよび水１６００ｇをボールミルポットに投入
し、８時間粉砕してスラリーを得た。得られたスラリー
をハニカム担体基材（１．３Ｌ，４００セル）に塗布し
乾燥した後、４００℃で２時間、空気雰囲気中で焼成し
た。この時の塗布量は、焼成後に６５ｇ／個になるよう
に設定した。EXAMPLES The present invention will be described below with reference to Examples, Comparative Examples and Test Examples. Example 1 Activated alumina powder 10 containing γ-alumina as a main component 10
00g, cerium oxide 1000g, 10% by weight HNO 3
400 g and 1600 g of water were put into a ball mill pot and pulverized for 8 hours to obtain a slurry. The obtained slurry was applied to a honeycomb carrier base material (1.3 L, 400 cells), dried, and then fired at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time was set to be 65 g / piece after firing.
【０００８】さらに、０．２モル／Ｌの硝酸銅または酢
酸銅溶液を５．２ｋｇとゼオライト粉末２ｋｇとを混合
しかきまぜた後、濾過した。これを３回繰り返した後、
乾燥および焼成を行いＣｕをイオン交換したゼオライト
粉末を調製した。このＣｕをイオン交換したゼオライト
粉末１８９０ｇ、シリカゾル（固形分２０％）１１５０
ｇおよび水１１００ｇを磁性ボールミルに投入し、粉砕
して得たスラリーを上記担体に焼成後に塗布量が２６０
ｇ／個になるように塗布し乾燥した後、４００℃で２時
間空気中で焼成し触媒Ｎo.１を得た。Further, a 0.2 mol / L copper nitrate or copper acetate solution was mixed with 5.2 kg and 2 kg of zeolite powder, and the mixture was filtered. After repeating this 3 times,
A zeolite powder in which Cu was ion-exchanged was prepared by drying and firing. This Cu ion-exchanged zeolite powder 1890 g, silica sol (solid content 20%) 1150
g and 1100 g of water were put into a magnetic ball mill, and the slurry obtained by pulverizing was pulverized on the above carrier to give a coating amount of 260.
After coating so as to be g / piece and drying, it was calcined in air at 400 ° C. for 2 hours to obtain a catalyst No.1.
【０００９】実施例２ 実施例１において、イオン交換金属としてＣｕの代わり
にＣｏを用いた以外は実施例１と同様にし、触媒Ｎo.２
を得た。 実施例３ 実施例１において、用いた酸化セリウムおよび活性アル
ミナの量をそれぞれ１５００ｇおよび５００ｇとした以
外は実施例１と同様にし、触媒 No.３を得た。 実施例４ 実施例１において、用いた酸化セリウムおよび活性アル
ミナの量をそれぞれ５００ｇおよび１５００ｇとした以
外は実施例１と同様にし、触媒Ｎo.４を得た。 実施例５ 実施例１において、用いた酸化セリウムを含む触媒層の
塗布量を１３０ｇ／個とした以外は実施例１と同様に
し、触媒Ｎo.５を得た。なお、ここで用いるゼオライト
粉末としてはＺＳＭ−５ゼオライト、モルデナイトおよ
びフェリエライト等を用いることができる。Example 2 A catalyst No. 2 was prepared in the same manner as in Example 1 except that Co was used as the ion exchange metal instead of Cu.
Got Example 3 A catalyst No. 3 was obtained in the same manner as in Example 1 except that the amounts of cerium oxide and activated alumina used were 1500 g and 500 g, respectively. Example 4 A catalyst No. 4 was obtained in the same manner as in Example 1 except that the amounts of cerium oxide and activated alumina used were 500 g and 1500 g, respectively. Example 5 A catalyst No. 5 was obtained in the same manner as in Example 1 except that the coating amount of the catalyst layer containing cerium oxide used was 130 g / piece. The zeolite powder used here may be ZSM-5 zeolite, mordenite, ferrierite, or the like.
【００１０】比較例１ 実施例１において、酸化セリウムおよび活性アルミナを
含む触媒層の塗布を省略した以外は実施例１と同様に
し、触媒Ｎo.１０１を得た。 比較例２ 実施例１において、酸化セリウムを用いず、活性アルミ
ナを２０００ｇ用いた以外は実施例１と同様にし、触媒
Ｎo.１０２を得た。 比較例３ 貴金属としてＰｄを含むアルミナを実施例１と同様にコ
ーティングし、乾燥し、焼成して調製した触媒Ｎo.１０
３を比較例３とする。γ−アルミナを主たる成分とする
活性アルミナ粉末１０００ｇに対して硝酸パラジウム溶
液を用いてパラジウム２．０重量％になるように加えよ
く攪拌した後、オーブン中１５０℃で３時間乾燥し、４
００℃で２時間空気気流中で焼成を行った。このパラジ
ウム担持活性アルミナ１５００ｇ、γ−アルミナを主た
る成分とする活性アルミナ８００ｇ、１０重量％ＨＮＯ
3 ４６０ｇ、水１８４０ｇをボールミルポットに投入
し、８時間粉砕してスラリーを得た。得られたスラリー
をモノリス担体基材（１．３Ｌ、４００セル）に塗布し
乾燥した後、４００℃で２時間、空気雰囲気中で焼成し
た。この時の塗布量は、焼成後に６５ｇ／個になるよう
に設定した。さらに、０．２モル／Ｌの硝酸銅または酢
酸銅溶液５．２ｋｇとゼオライト粉末２ｋｇを混合し攪
拌した後、濾過を行った。これを３回繰り返した後、乾
燥および焼成を行いＣｕをイオン交換したゼオライト粉
末を調製した。このＣｕをイオン交換したゼオライト粉
末１８９０ｇ、シリカゾル（固形分２０％）１１５０ｇ
および水１１００ｇを磁性ボールミルに投入し、粉砕し
て得たスラリーを上記担体に焼成後に塗布量２６０ｇ／
個になるように塗布し乾燥した後、４００℃で２時間空
気中で焼成し触媒Ｎo.１０３を調製した。Comparative Example 1 A catalyst No. 101 was obtained in the same manner as in Example 1 except that the coating of the catalyst layer containing cerium oxide and activated alumina was omitted. Comparative Example 2 A catalyst No. 102 was obtained in the same manner as in Example 1, except that 2000 g of activated alumina was used without using cerium oxide. Comparative Example 3 Catalyst No. 10 prepared by coating alumina containing Pd as a noble metal in the same manner as in Example 1, drying and firing.
3 is Comparative Example 3. Palladium nitrate solution was added to 1000 g of activated alumina powder containing γ-alumina as a main component so that the amount of palladium was 2.0% by weight, and the mixture was stirred well and dried in an oven at 150 ° C. for 3 hours.
Firing was performed at 00 ° C for 2 hours in an air stream. 1500 g of this palladium-supported activated alumina, 800 g of activated alumina containing γ-alumina as a main component, 10% by weight of HNO
3 460 g, water 1840g were charged into a ball mill pot to obtain a slurry for 8 hr. The obtained slurry was applied to a monolith carrier substrate (1.3 L, 400 cells), dried, and then fired at 400 ° C. for 2 hours in an air atmosphere. The coating amount at this time was set to be 65 g / piece after firing. Further, 5.2 kg of 0.2 mol / L copper nitrate or copper acetate solution and 2 kg of zeolite powder were mixed and stirred, and then filtered. After repeating this 3 times, it dried and baked and the zeolite powder which ion-exchanged Cu was prepared. This Cu ion-exchanged zeolite powder 1890 g, silica sol (solid content 20%) 1150 g
Then, 1100 g of water and 1100 g of water were charged into a magnetic ball mill, and the slurry obtained by pulverizing was calcinated on the above-mentioned carrier, and then a coating amount of 260 g /
After being coated so as to form individual pieces and dried, the catalyst No. 103 was prepared by baking in air at 400 ° C. for 2 hours.
【００１１】試験例 上記の各実施例および比較例において得られた触媒を実
験用のコンバーターに充填し、エンジン排気ガスにより
表１に示した条件で、性能評価試験を行った。Test Example The catalyst obtained in each of the above Examples and Comparative Examples was filled in an experimental converter, and a performance evaluation test was conducted under the conditions shown in Table 1 with engine exhaust gas.
【００１２】[0012]
【表１】耐久条件 エンジン 排気量２０００ｃｃ 耐久温度：５５０℃ 耐久時間：５０時間 耐久中入口エミッション ＣＯ ＝０．４〜０．６％ Ｏ2 ＝０．５±０．１％ ＮＯX ＝１５００ｐｐｍ ＨＣ ＝１０００ｐｐｍ ＣＯ2 ＝１４．９±０．１％ 性能評価条件 触媒容量：０．１２Ｌ 評価装置：排気モデルガス評価装置（ガスは、ボンベガ
スを使用） 触媒入口温度 初期 ３００℃，耐久後 ４００℃ 空間速度 約２００００ｈ-1 平均空燃比（Ａ／Ｆ）＝１８．０相当モデルガス ＨＣ ＝２５００ｐｐｍ（Ｃ１換算） ＮＯX ＝５００ｐｐｍ ＣＯ ＝１２００ｐｐｍ ＣＯ2 ＝１４．０％ Ｏ2 ＝４．５％ Ｈ2 Ｏ＝１０％ Ｎ2 バランス[Table 1] Durability conditions Engine displacement 2000 cc Durability temperature: 550 ° C Durability time: 50 hours In-durability inlet emission CO = 0.4-0.6% O 2 = 0.5 ± 0.1% NO X = 1500 ppm HC = 1000ppm CO 2 = 14.9 ± 0.1% Performance evaluation condition Catalyst capacity: 0.12L Evaluation device: Exhaust model gas evaluation device (gas used is cylinder gas) Catalyst inlet temperature initial 300 ° C, endurance 400 ° C space Speed Approx. 20000 h -1 Average air-fuel ratio (A / F) = 18.0 Equivalent model gas HC = 2500 ppm (C1 conversion) NO X = 500 ppm CO = 1200 ppm CO 2 = 14.0% O 2 = 4.5% H 2 O = 10% N 2 balance
【００１３】上記試験の結果を表２および表３に示す。The results of the above tests are shown in Tables 2 and 3.
【表２】 [Table 2]
【００１４】[0014]
【表３】 [Table 3]
【００１５】[0015]
【発明の効果】以上説明してきたように、本発明の排気
ガス浄化用触媒は、ハニカム担体上に、酸化セリウムと
活性アルミナとを主成分とし、貴金属成分を含まない無
機物から成る第１コート層と、このコート層上の金属、
例えばＣｕまたはＣｏをイオン交換したゼオライト粉末
を主成分とする無機物から成る第２コート層とを備えて
なることにより、リーン・バーン雰囲気下のより低い温
度領域からＮＯX を還元除去することができるという効
果を有する。As described above, the exhaust gas purifying catalyst of the present invention has the first coat layer made of an inorganic material containing cerium oxide and activated alumina as main components and no precious metal component on the honeycomb carrier. And the metal on this coat layer,
For example, by including the second coating layer made of an inorganic material whose main component is zeolite powder in which Cu or Co is ion-exchanged, NO X can be reduced and removed from a lower temperature region in a lean burn atmosphere. Has the effect.
Claims (2)
アルミナとの混合物を主成分とし貴金属成分を含まない
無機物から成る第１コート層と、このコート層上の金属
をイオン交換したゼオライト粉末を主成分とする無機物
から成る第２コート層とを備えてなることを特徴とする
排気ガス浄化用触媒。1. A first coat layer made of an inorganic substance containing a mixture of cerium oxide and activated alumina as a main component and not containing a noble metal component on a honeycomb carrier, and a zeolite powder in which the metal on the coat layer is ion-exchanged. An exhaust gas purifying catalyst comprising a second coat layer made of an inorganic material as a component.
用いたことを特徴とする請求項１記載の排気ガス浄化用
触媒。2. The exhaust gas purifying catalyst according to claim 1, wherein Cu or Co is used as the ion exchange metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5050869A JPH06262089A (en) | 1993-03-11 | 1993-03-11 | Catalyst for exhaust gas purification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5050869A JPH06262089A (en) | 1993-03-11 | 1993-03-11 | Catalyst for exhaust gas purification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06262089A true JPH06262089A (en) | 1994-09-20 |
Family
ID=12870736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5050869A Pending JPH06262089A (en) | 1993-03-11 | 1993-03-11 | Catalyst for exhaust gas purification |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06262089A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006314989A (en) * | 2005-04-11 | 2006-11-24 | Valtion Teknillinen Tutkimuskeskus | Catalyst for catalytically reducing nitrogen oxide and catalyst structure |
| US20100260652A1 (en) * | 2007-10-29 | 2010-10-14 | Ict Co., Ltd. | Catalyst for the removal of nitrogen oxides and method for the removal of nitrogen oxides with the same |
| JP2014012267A (en) * | 2012-06-07 | 2014-01-23 | Toyota Central R&D Labs Inc | Catalyst for reforming hydrocarbon, exhaust gas cleaning apparatus using the same and manufacturing method of catalyst for reforming hydrocarbon |
| US9833771B2 (en) | 2013-11-28 | 2017-12-05 | Cataler Corporation | Exhaust gas purifying catalyst |
-
1993
- 1993-03-11 JP JP5050869A patent/JPH06262089A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006314989A (en) * | 2005-04-11 | 2006-11-24 | Valtion Teknillinen Tutkimuskeskus | Catalyst for catalytically reducing nitrogen oxide and catalyst structure |
| US20100260652A1 (en) * | 2007-10-29 | 2010-10-14 | Ict Co., Ltd. | Catalyst for the removal of nitrogen oxides and method for the removal of nitrogen oxides with the same |
| US8318630B2 (en) * | 2007-10-29 | 2012-11-27 | Ict Co., Ltd. | Catalyst for removing nitrogen oxides and method for removing nitrogen oxides using the same |
| JP2014012267A (en) * | 2012-06-07 | 2014-01-23 | Toyota Central R&D Labs Inc | Catalyst for reforming hydrocarbon, exhaust gas cleaning apparatus using the same and manufacturing method of catalyst for reforming hydrocarbon |
| US9833771B2 (en) | 2013-11-28 | 2017-12-05 | Cataler Corporation | Exhaust gas purifying catalyst |
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