JPH01307446A - Waste gas purification catalyst - Google Patents
Waste gas purification catalystInfo
- Publication number
- JPH01307446A JPH01307446A JP63138941A JP13894188A JPH01307446A JP H01307446 A JPH01307446 A JP H01307446A JP 63138941 A JP63138941 A JP 63138941A JP 13894188 A JP13894188 A JP 13894188A JP H01307446 A JPH01307446 A JP H01307446A
- Authority
- JP
- Japan
- Prior art keywords
- fine powder
- purification catalyst
- carrier
- exhaust gas
- gas purification
- 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 29
- 238000000746 purification Methods 0.000 title claims abstract description 18
- 239000002912 waste gas Substances 0.000 title abstract 3
- 239000000843 powder Substances 0.000 claims abstract description 15
- 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 9
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 5
- 239000011029 spinel Substances 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims abstract description 4
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 27
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000010718 Oxidation Activity Effects 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract 2
- 230000000996 additive effect Effects 0.000 abstract 2
- 238000000151 deposition Methods 0.000 abstract 1
- 230000007704 transition Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 9
- 239000002002 slurry Substances 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000004303 calcium sorbate Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 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
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011973 solid acid Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、家庭用室内排気型燃焼器などの各種の燃焼機
器から排出される排気ガス中のＣＯ１炭化水素などの不
完全燃焼成分、未燃焼成分を酸化させると共に、毒性の
強いＮＯ８をＮｏに還元させ排気ガスを浄化する排気ガ
ス浄化触媒体に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the combustion of incompletely combusted components such as CO1 hydrocarbons and uncombusted components in exhaust gas discharged from various types of combustion equipment such as household indoor exhaust type combustors. The present invention relates to an exhaust gas purification catalyst body that oxidizes NO8 and reduces highly toxic NO8 to NO to purify exhaust gas.
従来の技術
従来、窒素酸化物（ＮＯｘ ）を還元してＮ２と０．に
する触媒は、自両車排ガス用の三元触媒としてｐｔ−Ｒ
ｈ、 Ｐｉ −Ｐｄ−Ｒｈ系（特公昭５２−８５６８６
号、特公昭５２−８８５８号公報）のものが有名であり
、良く使用されている。しかしこれらのものは燃料−空
気混合比率を理論値近くにとり、はとんど酸素の無い状
態、いわゆるウィンド幅の狭い状態でしか利用できない
。また空気過剰の排ガス中のＮＯｘを分解するには、還
元ガスとして僅かな量でも選択的に触媒に吸着するＮＨ
，を使用し、工業的なＮＯｘ除去法として一般化されて
いる。しかし石油ストーブやファンヒータなど家庭用室
内排気型燃焼器から排出される排気ガスは酸素が多く、
また排気ガスを浄化するのにＮＨ３などの特殊なガスを
実質的に使用することはできない。BACKGROUND OF THE INVENTION Conventionally, nitrogen oxides (NOx) are reduced to N2 and 0. The catalyst used is PT-R as a three-way catalyst for vehicle exhaust gas.
h, Pi-Pd-Rh system (Special Publication No. 52-85686
(Japanese Patent Publication No. 52-8858) is famous and often used. However, these systems have a fuel-air mixture ratio close to the theoretical value, and can only be used in conditions where there is no oxygen, a so-called narrow window width. In addition, in order to decompose NOx in exhaust gas with excess air, even a small amount of NH is selectively adsorbed on the catalyst as a reducing gas.
, has been popularized as an industrial NOx removal method. However, the exhaust gas emitted from household indoor exhaust type combustors such as kerosene stoves and fan heaters contains a lot of oxygen.
Further, special gases such as NH3 cannot be substantially used to purify exhaust gas.
発明が解決しようとする課題
酸素過剰な雰囲気で、しかもＮＨ，のような特殊な還元
ガスを用いることなしでＮＯｘを分解しＮ２まで還元す
ることは非常に困難である。人体に対する毒性はＮＯよ
りＮｏ、の方が大きく、また諸規制値もＮＯ２でなされ
ているため、ＮＯｘの完全分解でなく次善の策としてＮ
ｏ２をＮＯにする方法でもその価値は高い。２ＮＯ２＝
ｚＮＯ＋Ｏ，は平衡反応であり、その条件によっては比
較的簡単にＮＯ２をＮＯに変換させ得る可能性がある。Problems to be Solved by the Invention It is extremely difficult to decompose NOx and reduce it to N2 in an oxygen-rich atmosphere and without using a special reducing gas such as NH. Since NO is more toxic to the human body than NO, and various regulatory values are based on NO2, NO
Even the method of turning o2 to NO has high value. 2NO2=
zNO+O is an equilibrium reaction, and depending on the conditions, there is a possibility that NO2 can be converted to NO relatively easily.
経験的には貴金属系ではパラジウム、金属酸化物ではＦ
ｅ ２０３などが比較的この目的に合う触媒と言える
が、貴金属系はコストが高く、またＦｅ２Ｏ３は単独で
は酸化物の不安定さから高温で長時間使用すると劣化す
る傾向がある。したがってＦｅ２Ｏ３をベースとし、そ
の性質をより強く生かし、かつ構造的に安定な形にする
こトカできれば当初の目的に合った触媒としてその利用
価値は増大する。Empirically, palladium is used for noble metals, and F for metal oxides.
E203 and the like can be said to be relatively suitable catalysts for this purpose, but noble metal-based catalysts are expensive, and Fe2O3 tends to deteriorate when used alone at high temperatures for long periods of time due to the instability of its oxide. Therefore, if Fe2O3 can be used as a base and it can be made into a form that makes the most of its properties and is structurally stable, its utility value as a catalyst that meets the original purpose will increase.
本発明は上記の課題を解決するもので、排気ガス中のＣ
Ｏや未燃焼成分を酸化させると共に、Ｎｏ。The present invention solves the above problems, and aims to
In addition to oxidizing O and unburned components, No.
をＮｏに変換させて浄化し得る排気ガス浄化触媒体を提
供することを目的とするものである。It is an object of the present invention to provide an exhaust gas purification catalyst body that can purify exhaust gas by converting it into No.
課題を解決するための手段
上記の課題を解決するために本発明の排気ガス浄化触媒
体は、耐熱性セラミックスからなり内部に多数の細孔を
有するハニカム担体を化学式ＡＢＯ。Means for Solving the Problems In order to solve the above problems, the exhaust gas purification catalyst body of the present invention is made of a honeycomb carrier made of heat-resistant ceramics and having a large number of pores inside, and has a chemical formula of ABO.
（Ａは希土類元素またはアルカリ土類元素の少なくとも
一種類の元素、Ｂは遷移金属元素の少なくとも一種類の
元素）のペロブスカイト型複合酸化物の微粉末とスピネ
ル型複合酸化物であるＭｇＦｅ。(A is at least one kind of rare earth element or alkaline earth element, B is at least one kind of transition metal element) fine powder of perovskite type composite oxide and MgFe which is spinel type composite oxide.
Ｏ４の微粉末とをアルミナ系のたとえばアルミナゾル、
硝酸アルミニウムなどを焼成してＡＪ、Ｏ，皮膜とした
担持助剤と共に担持させたものである。O4 fine powder and alumina-based, for example, alumina sol,
It is made by baking aluminum nitrate or the like and supporting it together with AJ, O, and a supporting agent in the form of a film.
ＮＯｌを還元するには担体をアルカリ性、いわゆる電子
供与性の性質を持たせると、よりＦ ６ ！０３などの
触媒効果を発揮させることができる。したが′つて担体
も固体酸の強い性質を有したものは避けることが望まし
く、またそのアンダーコートとしてＭｇ、 Ｃｍ、 Ｓ
ｒ、 Ｂａなどのアルカリ土類金属の酸化物を用いるこ
とによってその効果を高めることができる。特にＭｇは
最もその効果が著しく、また熱安定性も優れている。本
発明は複合酸化物の形の一層安定性に富んだ構造で、か
つ上記の諸特性を有するスピネル型複合酸化物であるＭ
ｇ Ｆ ｅ ２０４の微粉末と酸化特性も有するペロブ
スカイト型複合酸化物の微粉末とを同時に耐熱性セラミ
ックスからなるハニカム担体に担持させたのである。In order to reduce NOl, it is better to make the carrier alkaline, so-called electron-donating, to reduce F 6 ! It is possible to exhibit the catalytic effect of 03 and the like. However, it is desirable to avoid carriers with strong solid acid properties, and Mg, Cm, S as an undercoat.
The effect can be enhanced by using oxides of alkaline earth metals such as r, Ba, etc. In particular, Mg has the most remarkable effect and also has excellent thermal stability. The present invention is a spinel-type composite oxide having a more stable structure in the form of a composite oxide and having the above-mentioned properties.
A fine powder of gFe 204 and a fine powder of a perovskite-type composite oxide that also has oxidizing properties were simultaneously supported on a honeycomb carrier made of heat-resistant ceramics.
作用
上記の構成により、排気ガス中のｃｏ１炭化水素など不
完全燃焼成分、未燃焼成分を触媒成分であるペロブスカ
イト型複合酸化物により酸化させると共に、触媒成分の
一つのＭｇ Ｆ ｅ ２０４ ｉこより毒性の強いＮＯ
，をＮＯに還元させて、排気ガスを浄化することができ
る。Effect With the above configuration, incompletely burned components and unburned components such as CO1 hydrocarbons in the exhaust gas are oxidized by the perovskite complex oxide that is the catalyst component, and toxic Strong NO
, can be reduced to NO to purify exhaust gas.
実施例
実施例１
耐熱性セラミックスとして市販のコーディエライト（２
ＭｇＯ・５ＳｉＯ，・２ＡＪｆｆｉＯ，）製のハニカム
担体を用いて、排気ガス浄化触媒体を調製した。用いた
ハニカム担体は横断面が１インチ平方当り約１００個の
ガス流通セルを有し、セル壁に貫通した多数の細孔を有
する外径１２０ｍｍ、厚さ２０ｍｍの円板状のもので、
約２２６ｍ１の体積を有していた。Examples Example 1 Commercially available cordierite (2
An exhaust gas purification catalyst body was prepared using a honeycomb carrier made of MgO.5SiO,.2AJffiO,). The honeycomb carrier used had a cross section of about 100 gas flow cells per square inch, and had a disk shape with an outer diameter of 120 mm and a thickness of 20 mm, having numerous pores penetrating the cell walls.
It had a volume of approximately 226 m1.
アルカリ・沈澱法で作製したＬａ（１，＠ Ｃｅ６．ｌ
Ｃｏ ０３の構造を有するペロブスカイト型複合酸化物
の微粉末（表面積１９．８ｍ”／ｐ、−次粒子粒径１μ
ｍ以下）と、Ｍｇ Ｆ Ｉｌｌ ２０４の構造を有する
スピネル型複合酸化物の微粉末（表面積１５．４ｍ諺／
ｙ、−次粒子粒径１μｍ以下）と、酢酸酸性アルミナゾ
ルと水を重量比］ ：１ ：２：２で混合し、これをボ
ールミル混練機を用いてよく混練し、さらに水を加えて
比重１．２１になるように調整し、スラリーを作製した
。このスラリーに前記ハニカム担体を１分間浸漬し、そ
の後スラリーから取出し、流通セル内の過剰スラリーを
圧縮空気でブローして、すべての流通セルの目詰まりを
除去した。次いで２００ ℃で２時間乾燥後、８００℃
で８０分間焼成して排気ガス浄化触媒体を得た。La(1,@Ce6.l) prepared by alkali precipitation method
Fine powder of perovskite-type composite oxide having the structure of Co03 (surface area 19.8 m"/p, -order particle size 1 μm)
m or less) and a fine powder of spinel-type composite oxide having the structure of Mg F Ill 204 (surface area 15.4 m or less).
y, -order particle diameter of 1 μm or less), acetic acid acidic alumina sol, and water at a weight ratio of 1:2:2, kneaded well using a ball mill, and further added water until the specific gravity was 1. .21, and a slurry was prepared. The honeycomb carrier was immersed in this slurry for 1 minute, then taken out from the slurry, and excess slurry in the flow cells was blown out with compressed air to remove clogging from all flow cells. Then, after drying at 200°C for 2 hours, drying at 800°C
The mixture was fired for 80 minutes to obtain an exhaust gas purification catalyst.
実施例２
実施例１で作製した排気ガス浄化触媒体を、さらに白金
族元素の一血類であるパラジウムの化合物の硝酸パラジ
ウム（Ｐｄ（Ｎ０３）！ ）水溶液中に５分間浸漬し、
その後取出して過剰水溶液を振動により振り落し、すべ
ての流通セルの目詰まりを除去し、次に１００℃の乾燥
空気で１時間乾燥後、６００℃の空気中で３０分間焼成
させ、２００ｍｙ／ｌ のパラジウム（Ｐｄ）を担持
させた。Example 2 The exhaust gas purification catalyst body produced in Example 1 was further immersed for 5 minutes in an aqueous solution of palladium nitrate (Pd(N03)!), which is a compound of palladium, which is a member of the platinum group element.
After that, it was taken out, the excess aqueous solution was shaken off by vibration, all flow cells were unclogged, and then dried in dry air at 100°C for 1 hour, and then calcined in air at 600°C for 30 minutes. Palladium (Pd) was supported.
比較例１
実施例１で用いたと同様のコーディエライト製のハニカ
ム担体を用い、ペロブスカイト型複合酸化物を担持させ
たものを作製した。すなわちＬｌ１６．ｇＣｅｏ、□Ｃ
ｏ ０３の構造を有する、実施例１で用いたのと同様の
ペロブスカイト型複合酸化物の微粉末と酢酸酸性アルミ
ナゾルと水を重量比１：１：１で混合し、これをボール
ミル混線機を用いよく混練してペロブスカイト型複合酸
化物のスラリーを作製した。このスラリーに前記ハニカ
ム担体を１分間浸漬し、その後スラリーから取出し、流
通セル内の過剰スラリーを圧縮空気でブローしてすべて
の目詰まりを除去した。次に２００℃で２時間乾燥空気
で乾燥後、８００℃で８０分間焼成した。Comparative Example 1 A cordierite honeycomb carrier similar to that used in Example 1 was used to support a perovskite complex oxide. That is, Ll16. gCeo, □C
Fine powder of a perovskite-type composite oxide similar to that used in Example 1 having the structure o03, acetic acid alumina sol, and water were mixed at a weight ratio of 1:1:1, and this was mixed using a ball mill mixer. A slurry of perovskite-type composite oxide was prepared by thoroughly kneading. The honeycomb carrier was immersed in this slurry for 1 minute, then removed from the slurry, and any excess slurry in the flow cell was blown out with compressed air to remove any clogging. Next, after drying with dry air at 200°C for 2 hours, it was fired at 800°C for 80 minutes.
比較例２
上記の比較例１で作製した排気ガス浄化触媒体に、実施
例２と同様に処理してＰｄを２００ｍｙ／ｌ 担持させ
た。Comparative Example 2 The exhaust gas purification catalyst produced in Comparative Example 1 above was treated in the same manner as in Example 2 to support 200 my/l of Pd.
実施例１．２および比較例１．２の排気ガス浄化触媒体
について、それぞれ種々の温度条件下でのＮＯ，−Ｎｏ
変換率（Ｎｏ、： ｔｏｏｐｐｍ、残部空気、ＳＶ値：
１０，０００ｈ−１）およびＣＯ変換率（Ｃｏ ：
１．ＯＯＯｐｐｍ、残部空気、ＳＶ値： １ｏ、ｏｏｏ
ｈ″″１）を求めた。その結果は第１図および第２図に
示すとおりである。実施例１゜２の排気ガス浄化触媒体
は、第１図から明らかなように比較例】、２のものに比
べて、同−Ｎｏ２−Ｎｏ変換率を示す触媒温度がかなり
低温側にシフトしており、また第２図において実施例１
．２のものは酸化活性としては若干低いが、ＮＯ□の還
元能力をも合わせて考慮すると、十分に実用的な排気ガ
ス浄化触媒体である。Regarding the exhaust gas purification catalyst bodies of Example 1.2 and Comparative Example 1.2, NO and -No.
Conversion rate (No.: tooppm, remaining air, SV value:
10,000h-1) and CO conversion rate (Co:
1. OOOppm, remaining air, SV value: 1o, ooo
h″″1) was determined. The results are shown in FIGS. 1 and 2. As is clear from FIG. 1, the catalyst temperature of the exhaust gas purification catalyst of Example 1-2, which shows the same -No2-No conversion rate, shifted considerably to the lower temperature side compared to that of Comparative Example 2. In addition, in FIG. 2, Example 1
．． Although the oxidation activity of No. 2 is slightly low, if the ability to reduce NO□ is also considered, it is a sufficiently practical exhaust gas purification catalyst.
発明の効果
以上のように本発明の排気ガス浄化触媒体は、［１熱性
セラミックスのハニカム担体に酸化活性を有するペロブ
スカイト型複合酸化物の微粉末とＮＯ□還元性能を有す
るスピネル型複合酸化物であるＭｇ Ｆ ｅ ｚ ０４
の微粉末とをアルミナ系の担持助剤と共に同時に付着担
持させたものであり、ペロブスカイト型複合酸化物の有
する酸化性能と、ＭｇＦｅ２Ｏ４の有するＮＯ！浄化性
能を合わせ持つ触媒体であって、室内排気型の燃焼器用
の排気ガス浄化触媒体として最適である。Effects of the Invention As described above, the exhaust gas purification catalyst body of the present invention comprises [1] a fine powder of perovskite type composite oxide having oxidizing activity and a spinel type composite oxide having NO□ reduction performance on a honeycomb carrier of thermal ceramics. A certain Mg Fe z 04
The fine powder of MgFe2O4 is simultaneously deposited and supported along with an alumina-based supporting agent, and has the oxidation performance of perovskite type composite oxide and the NO! of MgFe2O4. It is a catalyst body that has purification performance and is ideal as an exhaust gas purification catalyst body for indoor exhaust type combustors.
第１図は本発明の実施例１、実施例２、比較例１および
比較例２の排気ガス浄化触媒体における触媒温度とＮｏ
２−、Ｎｏ変換率との関係を示す図、第２図は同排気ガ
ス浄化触媒体における触媒温度とＣＯ変換率との関係を
示す図である。Figure 1 shows the catalyst temperature and No.
FIG. 2 is a diagram showing the relationship between the catalyst temperature and the CO conversion rate in the same exhaust gas purification catalyst body.
Claims (1)
するハニカム担体に、化学式ＡＢＯ＿３（Ａは希土類元
素またはアルカリ土類元素の少なくとも一種類の元素、
Ｂは遷移金属元素の少なくとも一種類の元素）のペロブ
スカイト型複合酸化物の微粉末とスピネル型複合酸化物
であるＭｇＦｅ＿２Ｏ＿４の微粉末とをアルミナ系の担
持助剤と共に担持させた排気ガス浄化触媒体。 ２、ペロブスカイト型複合酸化物の微粉末とスピネル型
複合酸化物の微粉末の上に白金族元素の少なくとも一種
類の元素を担持させた請求項１記載の排気ガス浄化触媒
体。[Claims] 1. A honeycomb carrier made of heat-resistant ceramics and having a large number of pores inside has a chemical formula ABO_3 (A is at least one element selected from rare earth elements or alkaline earth elements,
B is an exhaust gas purification catalyst in which a fine powder of a perovskite-type composite oxide of at least one type of transition metal element and a fine powder of MgFe_2O_4, which is a spinel-type composite oxide, are supported together with an alumina-based supporting agent. . 2. The exhaust gas purification catalyst body according to claim 1, wherein at least one type of platinum group element is supported on the fine powder of perovskite type composite oxide and the fine powder of spinel type composite oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63138941A JPH01307446A (en) | 1988-06-06 | 1988-06-06 | Waste gas purification catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63138941A JPH01307446A (en) | 1988-06-06 | 1988-06-06 | Waste gas purification catalyst |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01307446A true JPH01307446A (en) | 1989-12-12 |
Family
ID=15233731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63138941A Pending JPH01307446A (en) | 1988-06-06 | 1988-06-06 | Waste gas purification catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01307446A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008105027A (en) * | 2006-10-23 | 2008-05-08 | Haldor Topsoe As | Method and apparatus for purification of exhaust gas from compression ignition engine |
-
1988
- 1988-06-06 JP JP63138941A patent/JPH01307446A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008105027A (en) * | 2006-10-23 | 2008-05-08 | Haldor Topsoe As | Method and apparatus for purification of exhaust gas from compression ignition engine |
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