JPS6141610B2 - - Google Patents
Info
- Publication number
- JPS6141610B2 JPS6141610B2 JP54042707A JP4270779A JPS6141610B2 JP S6141610 B2 JPS6141610 B2 JP S6141610B2 JP 54042707 A JP54042707 A JP 54042707A JP 4270779 A JP4270779 A JP 4270779A JP S6141610 B2 JPS6141610 B2 JP S6141610B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- carrier
- catalysts
- titania
- zirconia
- 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.)
- Expired
Links
- 239000003054 catalyst Substances 0.000 claims description 38
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 26
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 20
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 19
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 239000010953 base metal Substances 0.000 claims description 7
- 230000003647 oxidation Effects 0.000 claims description 7
- 229910052878 cordierite Inorganic materials 0.000 claims description 6
- 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 claims description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 5
- 229910052863 mullite Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 239000010941 cobalt Substances 0.000 claims 1
- 229910017052 cobalt Inorganic materials 0.000 claims 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims 1
- 229910052759 nickel Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 9
- 239000007864 aqueous solution Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 description 7
- 230000003197 catalytic effect Effects 0.000 description 7
- 229910052697 platinum Inorganic materials 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052763 palladium Inorganic materials 0.000 description 4
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 3
- 239000005751 Copper oxide Substances 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910000431 copper oxide Inorganic materials 0.000 description 3
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 108010003320 Carboxyhemoglobin Proteins 0.000 description 1
- 108010054147 Hemoglobins Proteins 0.000 description 1
- 102000001554 Hemoglobins Human genes 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
本発明は一酸化炭素、水素、炭化水素ガスなど
の可燃性ガスの酸化触媒に関するものであつて本
発明の触媒はとくに内燃機関の排ガスのような苛
酷な条件下に使用して耐久力の高い触媒である。
更に詳しくは、可燃性ガスの酸化触媒としてコ
ージユライト又はムライトの表面にチタニアある
いはジルコニアを被覆した担体上に白金属元素又
は卑金属の酸化物を担持させた触媒を提供するも
のである。
内燃機関、例えば自動車の排ガス中には一酸化
炭素をはじめ窒素酸化物、炭化水素などいわゆる
公害性物質が多量に含有されているが、とりわけ
一酸化炭素の発生源は自動車排ガスであつて血液
中のヘモグロビンと結合し、回復不能な一酸化炭
素ヘモグロビンとなつてしまうので、その浄化対
策は早くから進められて来ている。
その主なるものはエンジン改良方法、排気マニ
ホールドリアクター、サーマルリアクターおよび
触媒コンバーター方式などであるが、未だ満足す
べき成果をあげているとは言い難い。
ことに触媒方式にあつては白金のような貴金
属、銅や鉄のような卑金属の酸化物を触媒成分と
し、そのものを粒状、ハニカム状等に成形したも
のや、それら触媒成分物質をアルミナ、チタニア
などの担体に直接浸漬担持させたものがあるが、
これら触媒は性能、寿命、耐熱性など現在までの
ところ多くの問題点を残している。
本発明者らは内燃機関の排ガス、焼結炉の排ガ
スなどのように一酸化炭素、水素、炭化水素ガス
などの可燃性ガスを触媒酸化して、有害成分の除
去、酸化反応熱の利用を行うにあたり、アルミ
ナ、コージユライト、ムライトの如き耐熱性多孔
質の表面にチタニア、あるいはジルコニアを被覆
した担体上に貴金属、卑金属の酸化物を担持させ
た触媒が高性能でかつ耐熱性に優れているという
ことに注目し、上記触媒について鋭意実験検討を
重ね、他に類例をみない本発明を提案するに至つ
た。
従来、担体として使用されるアルミナは約600
℃までは耐熱性がありγ型の結晶構造で安定であ
るがチタニアに比べて性能が若干劣る。又、チタ
ニアは500℃以上では結晶構造が触媒活性を有す
るアナターゼ型からルチル型に次第に変化してゆ
き、耐熱性に難点がある。さらにジルコニアは熱
的にも極めて安定であり、触媒にした時の性能も
優れているが、価格が高く、ジルコニアだけを成
型して担体に使用するには経済性が成り立たな
い。
又、触媒活性成分として使用される金属酸化物
の中には高温下で溶融したり担体と反応して触媒
活性を低下させるものもある。そこで本発明者ら
はアルミナ、コージユライト、ムイラトなどの耐
熱性多孔質の表面にチタニア、あるいはジルコニ
アを被覆したものを担体にすると、チタニア自体
の有する触媒活性の安定な温度が高温に移行する
とともに、チタニアあるいはジルコニアの使用量
を少なくしても同様の効果を発揮できることを見
い出した。
本発明は一酸化炭素、水素、炭化水素ガスなど
の可燃性ガスの酸化触媒として、コージユライト
又はムライトの表面にチタニア、あるいはジルコ
ニアを被覆するなどして添加した担体上に卑金属
の酸化物あるいは白金属元素を担体させたことを
特徴とする触媒である。
ここでコージユライト又はムライトの基材表面
にチタニア、ジルコニアを被覆するには基材をチ
タニアのアルコラートや硝酸ジルコニウムの水溶
液に浸漬後、焼成することで、それぞれの酸化物
が容易に得られる。
次に、このようにして得られた担体に卑金属の
酸化物あるいは白金属元素を担持させる方法は従
来から用いられている方法で良く、例えば卑金属
の酸化物を担体させる場合には卑金属の硝酸塩水
溶液に担体を浸漬後焼成すれば良く、又白金属元
素を担持させる場合には白金属元素の塩化物水溶
液に担体を浸漬後水素還元すれば調製できる。
以上のようにして得られた触媒は一酸化炭素、
水素、炭化水素ガスなど可燃性ガスを酸化する反
応に対し300〜800℃の温度領域で高い触媒活性を
示した。
以下、実施例により本発明を具体的に説明す
る。
実施例においては粒状触媒について記述してあ
るが、触媒の形状を特に限定するものではなく、
ハニカム状、板状などの触媒形状で用いて良いこ
とは言うまでもない。
実施例においてはガス温度400℃の試験結果し
か示していないが、400℃以外のガス温度、例え
ば室温から1500℃前後まで使用可能である。
例 1
粒径2〜4mmのγ−Al2O3から成るペレツトを
硝酸ジルコニウム水溶液に浸漬後、乾燥し、550
℃で3時間焼成してアルミナに対してジルコニア
が20重量%被覆された担体を得た。
このようにして得られた担体を硝酸第二鉄水溶
液、硝酸第二銅水溶液、硝酸クロム水溶液に各々
浸漬し、酸化鉄、酸化銅、酸化クロムがそれぞれ
10重量%になるように担持した触媒1、2、3を
又同じ担体を塩化白金酸水溶液、塩化パラジウム
水溶液に各々浸漬し、白金、パラジウムがそれぞ
れ1重量パーセントになるように担持した触媒
4、5をそれぞれ調製した。
これらの触媒の活性評価を表1に示す条件で実
施し、その結果を表2に示す。
The present invention relates to an oxidation catalyst for combustible gases such as carbon monoxide, hydrogen, and hydrocarbon gases, and the catalyst of the present invention has high durability especially when used under harsh conditions such as exhaust gas from internal combustion engines. It is a catalyst. More specifically, the present invention provides a combustible gas oxidation catalyst in which a platinum element or a base metal oxide is supported on a carrier made of cordierite or mullite coated with titania or zirconia. Exhaust gas from internal combustion engines, such as automobiles, contains large amounts of so-called polluting substances such as carbon monoxide, nitrogen oxides, and hydrocarbons, but the source of carbon monoxide in particular is automobile exhaust gas, which is found in blood. Because it combines with hemoglobin and becomes irrecoverable carboxyhemoglobin, measures to purify it have been underway for a long time. The main areas of improvement are engine improvement methods, exhaust manifold reactors, thermal reactors, and catalytic converter systems, but it is difficult to say that satisfactory results have been achieved so far. In particular, in the case of catalytic methods, oxides of noble metals such as platinum or base metals such as copper and iron are used as catalyst components, and these oxides are formed into granules or honeycomb shapes, and these catalytic component materials are used in alumina, titania, etc. There are products that are directly immersed and supported on carriers such as
These catalysts still have many problems such as performance, lifespan, and heat resistance. The present inventors catalytically oxidize combustible gases such as carbon monoxide, hydrogen, and hydrocarbon gases, such as exhaust gas from internal combustion engines and sintering furnaces, to remove harmful components and utilize the heat of oxidation reaction. In this process, a catalyst in which noble metal or base metal oxides are supported on a heat-resistant porous surface such as alumina, cordierite, or mullite coated with titania or zirconia has high performance and excellent heat resistance. Taking note of this fact, we conducted extensive experimental studies on the above-mentioned catalyst, and came to propose the present invention, which is unprecedented. Conventionally, alumina used as a carrier is about 600
It has heat resistance up to ℃ and is stable with a γ-type crystal structure, but its performance is slightly inferior to titania. Furthermore, at temperatures above 500°C, the crystal structure of titania gradually changes from an anatase type, which has catalytic activity, to a rutile type, and it has a drawback in heat resistance. Furthermore, zirconia is extremely stable thermally and has excellent performance when used as a catalyst, but it is expensive and it is not economical to mold only zirconia and use it as a carrier. Furthermore, some metal oxides used as catalytically active components melt at high temperatures or react with the carrier, reducing the catalytic activity. Therefore, the present inventors used a heat-resistant porous material such as alumina, cordierite, or muirato coated with titania or zirconia as a carrier. It was discovered that the same effect can be achieved even if the amount of titania or zirconia used is reduced. The present invention is an oxidation catalyst for combustible gases such as carbon monoxide, hydrogen, and hydrocarbon gases. This is a catalyst characterized by supporting a metal element. Here, in order to coat the surface of a cordierite or mullite base material with titania or zirconia, the respective oxides can be easily obtained by immersing the base material in an aqueous solution of titania alcoholate or zirconium nitrate and then firing. Next, a method for supporting a base metal oxide or a platinum metal element on the support thus obtained may be any conventional method. For example, when supporting a base metal oxide, a base metal nitrate aqueous solution may be used. The carrier may be immersed in a solution of chloride of a platinum metal element and then calcined, or in the case of supporting a platinum metal element, the carrier may be immersed in an aqueous solution of chloride of a platinum metal element and then reduced with hydrogen. The catalyst obtained in the above manner contains carbon monoxide,
It showed high catalytic activity in the temperature range of 300-800℃ for reactions that oxidize combustible gases such as hydrogen and hydrocarbon gases. Hereinafter, the present invention will be specifically explained with reference to Examples. Although granular catalysts are described in the examples, the shape of the catalyst is not particularly limited;
Needless to say, the catalyst may be used in a honeycomb or plate shape. Although the examples only show test results at a gas temperature of 400°C, gas temperatures other than 400°C can be used, for example from room temperature to around 1500°C. Example 1 Pellets made of γ-Al 2 O 3 with a particle size of 2 to 4 mm were immersed in an aqueous solution of zirconium nitrate, dried, and
After firing at ℃ for 3 hours, a carrier was obtained in which 20% by weight of zirconia was coated on alumina. The carrier thus obtained was immersed in a ferric nitrate aqueous solution, a cupric nitrate aqueous solution, and a chromium nitrate aqueous solution, respectively.
Catalysts 1, 2, and 3 were supported at 10% by weight, and catalyst 4 was prepared by immersing the same carrier in an aqueous solution of chloroplatinic acid and an aqueous solution of palladium chloride, respectively, to support platinum and palladium at 1% by weight. 5 were prepared respectively. The activity of these catalysts was evaluated under the conditions shown in Table 1, and the results are shown in Table 2.
【表】【table】
【表】
例 2
例1に示すγ−Al2O3のペレツトをテトトラ−
イソプロピルチタネートのアルコール溶液に浸漬
後、乾燥し、500℃で3時間焼成してアルミナに
対してチタンが20重量%担持された担体を得た。
このようにして得られた担体を例1と同様にし
て酸化鉄、酸化銅、酸化クロムがそれぞれ10重量
%になるように担持した触媒6、7、8を又白
金、パラジウムがそれぞれ1重量%になるように
担持した触媒9、10を調製して、表1に示す条件
で触媒の活性評価を行い、表3のような結果が得
られた。[Table] Example 2 The γ-Al 2 O 3 pellets shown in Example 1 were
The carrier was immersed in an alcoholic solution of isopropyl titanate, dried, and fired at 500°C for 3 hours to obtain a carrier in which 20% by weight of titanium was supported on alumina. Catalysts 6, 7, and 8 were prepared in the same manner as in Example 1 so that iron oxide, copper oxide, and chromium oxide were supported at 10% by weight each, and platinum and palladium were each supported at 1% by weight. Catalysts 9 and 10 were prepared and the activity of the catalysts was evaluated under the conditions shown in Table 1, and the results shown in Table 3 were obtained.
【表】
例 3
上記触媒の一酸化炭素以外の可燃性ガスを酸化
する反応についての効果をみるために、例1の白
金触媒4を用いて表4の条件で触媒活性を評価し
た結果を表5に示す。[Table] Example 3 In order to see the effect of the above catalyst on the reaction of oxidizing combustible gases other than carbon monoxide, the results of evaluating the catalytic activity under the conditions shown in Table 4 using platinum catalyst 4 of Example 1 are shown below. 5.
【表】【table】
【表】
例 4
酸化触媒の耐熱性をテストし、従来の触媒調製
法のものと比較するためにアルミナ担体、チタニ
ア担体、又アルミナのジルコニア被覆担体、アル
ミナのチタニア被覆担体に白金を1重量%担持し
た触媒、11、12、4、9を耐熱テストとして、
700℃で120時間空気中で焼成して表1に示す条件
で触媒の活性評価を行い、表6のような結果が得
られた。[Table] Example 4 To test the heat resistance of an oxidation catalyst and compare it with that of a conventional catalyst preparation method, 1% by weight of platinum was added to an alumina support, a titania support, a zirconia-coated alumina support, and a titania-coated alumina support. Supported catalysts 11, 12, 4, and 9 were tested for heat resistance.
The activity of the catalyst was evaluated under the conditions shown in Table 1 by firing in air at 700°C for 120 hours, and the results shown in Table 6 were obtained.
【表】
実施例 1
担体としてγ−Al2O3のかわりに粒子径2〜4
mmφのコージユライトを用いて例1と同様の方法
で酸化鉄、酸化銅、酸化クロムがそれぞれ10重量
%になるように担持した触媒13、14、15を、又、
白金、パラシウムがそれぞれ1重量%になるよう
に担持した触媒16、17を調製した。
これらの触媒の活性評価を表1に示す条件で実
施した結果を表7に示す。[Table] Example 1 Particle size 2 to 4 instead of γ-Al 2 O 3 as carrier
Catalysts 13, 14, and 15 were prepared by supporting iron oxide, copper oxide, and chromium oxide in an amount of 10% by weight each in the same manner as in Example 1 using mmφ cordierite.
Catalysts 16 and 17 were prepared in which platinum and palladium were supported at 1% by weight, respectively. The activity of these catalysts was evaluated under the conditions shown in Table 1, and the results are shown in Table 7.
【表】
触媒16について700℃で120時間空気中で焼成し
て表1に示す条件で触媒の活性評価を行い、CO
酸化率94%という耐熱性テスト前と同じ結果が得
られた。
実施例 2
担体としてγ−Al2O3のかわりに粒子径2〜4
mmφのムライトを用いて例1と同様の方法で酸化
鉄、酸化銅、酸化クロムがそれぞれ10重量%にな
るように担持した触媒18、19、20を、又、白金、
パラジウムがそれぞれ1重量%になるように担持
した触媒21、22を調製した。
これらの触媒の活性評価を表1に示す条件で実
施し、その結果を表8に示す。[Table] Catalyst 16 was calcined in air at 700°C for 120 hours and the activity of the catalyst was evaluated under the conditions shown in Table 1.
The same result as before the heat resistance test was obtained, with an oxidation rate of 94%. Example 2 Particle size 2 to 4 instead of γ-Al 2 O 3 as carrier
Catalysts 18, 19, and 20 were prepared by using mmφ mullite to support iron oxide, copper oxide, and chromium oxide in an amount of 10% by weight, respectively, in the same manner as in Example 1.
Catalysts 21 and 22 each containing 1% by weight of palladium were prepared. The activity of these catalysts was evaluated under the conditions shown in Table 1, and the results are shown in Table 8.
【表】
触媒21について100℃で120時間空気中で焼成し
て表1に示す条件で触媒の活性評価を行い、CO
酸化率93%という耐熱性テスト前と同じ結果が得
られた。[Table] Catalyst 21 was calcined in air at 100°C for 120 hours and the activity of the catalyst was evaluated under the conditions shown in Table 1.
The same result as before the heat resistance test was obtained, with an oxidation rate of 93%.
Claims (1)
あるいはジルコニアを添加した担体上に白金属元
素又は銅、クロム、鉄、ニツケル、コバルトなど
の卑金属の酸化物を担持させたことを特徴とする
可燃性ガスの酸化触媒。1. Oxidation of flammable gas characterized by supporting cordierite or mullite with oxides of platinum metal elements or base metals such as copper, chromium, iron, nickel, and cobalt on a carrier to which titania or zirconia is added. catalyst.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4270779A JPS55134641A (en) | 1979-04-09 | 1979-04-09 | Oxidation catalyst |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4270779A JPS55134641A (en) | 1979-04-09 | 1979-04-09 | Oxidation catalyst |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55134641A JPS55134641A (en) | 1980-10-20 |
JPS6141610B2 true JPS6141610B2 (en) | 1986-09-16 |
Family
ID=12643533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4270779A Granted JPS55134641A (en) | 1979-04-09 | 1979-04-09 | Oxidation catalyst |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55134641A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0616846B2 (en) * | 1988-09-29 | 1994-03-09 | 日本化成株式会社 | Wet ceramic oxidation catalyst for rotten odor gas oxidation deodorization and deodorization method using the same |
KR20010037198A (en) * | 1999-10-14 | 2001-05-07 | 이계안 | Diesel oxidation catalyst |
JP4498881B2 (en) * | 2004-10-15 | 2010-07-07 | 大倉工業株式会社 | Particulate combustion catalyst |
-
1979
- 1979-04-09 JP JP4270779A patent/JPS55134641A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS55134641A (en) | 1980-10-20 |
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