JP2851769B2 - Oxide catalyst material for removing nitrogen oxides and method for removing nitrogen oxides - Google Patents
Oxide catalyst material for removing nitrogen oxides and method for removing nitrogen oxidesInfo
- Publication number
- JP2851769B2 JP2851769B2 JP5174320A JP17432093A JP2851769B2 JP 2851769 B2 JP2851769 B2 JP 2851769B2 JP 5174320 A JP5174320 A JP 5174320A JP 17432093 A JP17432093 A JP 17432093A JP 2851769 B2 JP2851769 B2 JP 2851769B2
- Authority
- JP
- Japan
- Prior art keywords
- nitrogen oxides
- oxide
- removing nitrogen
- exhaust gas
- catalyst material
- 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 - Fee Related
Links
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims description 63
- 239000003054 catalyst Substances 0.000 title claims description 21
- 238000000034 method Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 title claims description 11
- 239000007789 gas Substances 0.000 claims description 26
- 239000002131 composite material Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052733 gallium Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 230000001603 reducing effect Effects 0.000 claims description 6
- 229910052596 spinel Inorganic materials 0.000 claims description 6
- 239000011029 spinel Substances 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 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 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、新規な窒素酸化物を還
元除去することのできる酸化物触媒材料およびこれを用
いて排ガス中の窒素酸化物を除去する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel oxide catalyst material capable of reducing and removing nitrogen oxides and a method for removing nitrogen oxides in exhaust gas using the same.
【０００２】[0002]
【従来技術】近年、環境汚染が問題となり、その中でも
自動車の排気ガス中のＮＯｘ、ＣＯｘ等の有害物質を分
解、除去する方法の開発が急務となっている。そこで、
従来より用いられている自動車の排気ガス浄化用触媒と
しては、一酸化炭素（ＣＯ）および炭化水素（ＣｘＨ
ｙ）の酸化と、窒素酸化物（ＮＯｘ）の還元を同時に行
う三元触媒が汎用されている。このような三元触媒とし
ては、Ｐｄ、Ｐｔ、Ｒｈ等の貴金属をγ−アルミナをコ
ートしたコージェライト等の耐火性担体に担持したもの
が用いられる。2. Description of the Related Art In recent years, environmental pollution has become a problem, and among them, development of a method for decomposing and removing harmful substances such as NOx and COx in automobile exhaust gas has been urgently required. Therefore,
Conventionally used automobile exhaust gas purifying catalysts include carbon monoxide (CO) and hydrocarbons (CxH).
Three-way catalysts that simultaneously oxidize y) and reduce nitrogen oxides (NOx) are widely used. As such a three-way catalyst, a catalyst in which a noble metal such as Pd, Pt, and Rh is supported on a refractory carrier such as cordierite coated with γ-alumina is used.
【０００３】また、上記以外にアンモニアを用いた選択
的接触還元法や、金属を担持した疎水性ゼオライトを触
媒として炭化水素と接触させながらＮＯｘを除去する方
法などが知られている。[0003] In addition to the above, there are known a selective catalytic reduction method using ammonia, and a method of removing NOx while contacting a hydrocarbon with a metal-supporting hydrophobic zeolite as a catalyst.
【０００４】[0004]
【発明が解決しようとする問題点】しかしながら、上記
三元触媒は、およそ０．５％程度の低酸素濃度において
のみ排気ガスの浄化を効率よく行うことができ、排気ガ
スの酸素濃度が１％を越えるような高濃度域では有効に
働かなくなるという問題がある。そこで、通常は排気ガ
ス中の酸素濃度を測定して常に最適な空燃費となるよう
に制御することが行われており、これより高い酸素濃度
の排気ガス浄化はほとんどできていないのが現状であ
る。However, the three-way catalyst can efficiently purify the exhaust gas only at a low oxygen concentration of about 0.5%, and the oxygen concentration of the exhaust gas is 1%. However, there is a problem that it does not work effectively in a high concentration region exceeding the above. Therefore, it is usual to measure the oxygen concentration in the exhaust gas and control it so that the optimum air-fuel efficiency is always obtained.At present, it is hardly possible to purify the exhaust gas with a higher oxygen concentration. is there.
【０００５】そこで、ガソリンエンジンにおいては、低
燃費化を図るために希薄燃焼方式の研究開発が行われて
いるが、この場合、排気ガス中の酸素濃度が数％とな
り、貴金属の酸素被毒により排気ガスの浄化ができなく
なる欠点がある。またディーゼルエンジンにおいても、
現在の燃焼方式では排気ガス中の酸素濃度が高いために
排気ガスの浄化が全くなされていないのが現状である。[0005] Therefore, in the case of gasoline engines, research and development of a lean burn system has been carried out in order to achieve low fuel consumption. There is a drawback that exhaust gas cannot be purified. Also for diesel engines,
At present, exhaust gas is not purified at all in the current combustion method due to high oxygen concentration in the exhaust gas.
【０００６】また、アンモニアを用いる方法は、工場等
の固定式の燃焼装置において使用され、酸素濃度の高い
排気ガス中のＮＯｘの還元を行うことができるが、この
方法は自動車等の移動式燃焼装置に取り付けることは安
全性の面で問題があり、さらに、金属を担持した疎水性
ゼオライトを触媒として用いた系もディーゼルエンジン
などへの適用が難しく、いずれの方法もその用途が限ら
れてしまうという問題がある。Further, the method using ammonia is used in a fixed combustion device such as a factory and can reduce NOx in exhaust gas having a high oxygen concentration. There is a problem in terms of safety when attached to the equipment, and furthermore, it is difficult to apply a system using a metal-supported hydrophobic zeolite as a catalyst to a diesel engine or the like, and each method has a limited use. There is a problem.
【０００７】よって、本発明はディーゼルエンジンなど
のような酸素濃度の高い排気ガス中で、有効に排気ガス
の浄化が可能で、且つアンモニア等の毒性の還元剤を必
要としない触媒として有用な触媒材料およびそれを用い
た窒素酸化物除去方法を提供するものである。Therefore, the present invention provides a catalyst useful as a catalyst which can effectively purify exhaust gas in an exhaust gas having a high oxygen concentration such as a diesel engine and which does not require a toxic reducing agent such as ammonia. A material and a method for removing nitrogen oxides using the same are provided.
【０００８】[0008]
【問題点を解決するための手段】本発明者らは、上記の
問題点に対して研究を進めた結果、亜鉛（Ｚｎ）とガリ
ウム（Ｇａ）を金属元素として含み、且つスピネル型結
晶構造からなる複合酸化物が高酸素濃度中でも高い触媒
作用を有することを見出し、本発明に至った。[Means for Solving the Problems] As a result of research on the above problems, the present inventors have found that zinc (Zn) and gallium (Ga) are contained as metal elements, and the spinel type crystal structure is used. It has been found that such a composite oxide has a high catalytic action even at a high oxygen concentration, and the present invention has been achieved.
【０００９】即ち、本発明の窒素酸化物除去用酸化物触
媒材料は、少なくともＺｎおよびＧａを主金属元素とし
て含むスピネル型構造の複合酸化物からなることを特徴
とするものである。また、本発明の窒素酸化物除去方法
は、過剰の酸素と還元性を有する炭素含有ガスが存在す
る酸化雰囲気中で、少なくともＺｎおよびＧａを主金属
元素として含むスピネル型構造の複合酸化物と窒素酸化
物を含む排ガスと接触させることを特徴とするものであ
る。That is, the oxide catalyst material for removing nitrogen oxides of the present invention is characterized by comprising a composite oxide having a spinel structure containing at least Zn and Ga as main metal elements. Further, the method for removing nitrogen oxides of the present invention is a method for removing a nitrogen-containing oxide having a spinel structure containing at least Zn and Ga as main metal elements in an oxidizing atmosphere in which excess oxygen and a carbon-containing gas having a reducing property are present. It is characterized by being brought into contact with an exhaust gas containing an oxide.
【００１０】以下、本発明を詳述する。本発明において
用いられる複合酸化物は、金属元素として亜鉛（Ｚｎ）
とガリウム（Ｇａ）を含むもので、結晶構造がスピネル
型構造を呈するものである。このスピネル型構造の複合
酸化物は、一般式としてＺｎＧａ2 Ｏ4 で表されるもの
で、図１にそのＸ線回折チャートを示した。本発明で用
いられる複合酸化物は、ＺｎとＧａの比率は原則的には
１：２の原子比で構成されるが、Ｚｎ：Ｇａが１：１．
９５〜２．０５の範囲を逸脱すると、スピネル型結晶構
造以外の結晶やガラスの生成が増加し触媒性能が劣化す
る場合がある。Hereinafter, the present invention will be described in detail. The composite oxide used in the present invention is zinc (Zn) as a metal element.
And gallium (Ga), and has a spinel-type crystal structure. This spinel-type composite oxide is represented by the general formula ZnGa 2 O 4 , and FIG. 1 shows its X-ray diffraction chart. In the composite oxide used in the present invention, the ratio of Zn to Ga is basically constituted by an atomic ratio of 1: 2, but the ratio of Zn: Ga is 1: 1.
If the ratio is out of the range of 95 to 2.05, the generation of crystals and glass other than the spinel type crystal structure may increase, and the catalyst performance may deteriorate.
【００１１】また、上記複合酸化物は、窒素を含有する
排ガスを接触させることにより排ガス中に含まれる窒素
酸化物（ＮＯｘ）を還元し除去することができるが、排
ガス中の酸素濃度が１０％程度の高濃度であっても優れ
たＮＯｘ還元性能を有する。この時、雰囲気中にＣ2 Ｈ
4 ，Ｃ3 Ｈ6 ，Ｃ3 Ｈ8 などの炭化水素、ＣＨ3 ＯＨ，
Ｃ2 Ｈ5 ＯＨなどのアルコール、ＣＯなどの還元性を有
する炭素ガスを含有させて前記触媒材料と接触させる
と、ＮＯｘ還元性が高くなる。The above-mentioned composite oxide can reduce and remove nitrogen oxides (NOx) contained in the exhaust gas by bringing the exhaust gas into contact with the exhaust gas containing nitrogen. It has excellent NOx reduction performance even at such a high concentration. At this time, C 2 H
4 , C 3 H 6 , C 3 H 8 and other hydrocarbons, CH 3 OH,
When an alcohol such as C 2 H 5 OH or a carbon gas having a reducing property such as CO is contained and brought into contact with the catalyst material, the NOx reducing property is increased.
【００１２】次に、本発明の酸化物触媒材料を製造する
には、例えば、出発原料として、ＺｎやＧａの酸化物や
熱処理により酸化物を生成できる炭酸塩、硝酸塩などを
用いて、これらをＺｎ：Ｇａの金属元素比が１：２にな
るように、それぞれ秤量し水などに溶解させて十分に攪
拌した後、アルカリで中和処理することにより沈殿物を
得、これを５００〜１６００℃の酸化性雰囲気中で５〜
３０時間熱処理することによりＺｎとＧａのスピネル型
結晶の複合酸化物粉末を得ることができる。Next, in order to produce the oxide catalyst material of the present invention, for example, as a starting material, an oxide of Zn or Ga, a carbonate or a nitrate capable of forming an oxide by heat treatment, and the like are used. Each was weighed and dissolved in water or the like so that the metal element ratio of Zn: Ga became 1: 2, and the mixture was sufficiently stirred, and then neutralized with an alkali to obtain a precipitate. 5 in an oxidizing atmosphere of
By performing heat treatment for 30 hours, a composite oxide powder of a spinel crystal of Zn and Ga can be obtained.
【００１３】上記複合酸化物を製造する方法としては、
上記の他に酸化物や他の金属塩による固相反応合成、金
属アルコキシド等のゾル−ゲル法合成によって試料は合
成されるが、何等これらの製造方法に規定されるもので
はない。いずれも熱処理は５００℃〜１６００℃の酸化
性雰囲気中で５〜３０時間行われ、特に低い温度で熱処
理することが粉末の比表面積を高めるために有効であ
る。なお、熱処理温度が５００℃より低いと結晶化が不
充分となり、１６００℃を越えると緻密化してしまい不
適となる。As a method for producing the above-mentioned composite oxide,
In addition to the above, the sample is synthesized by a solid phase reaction synthesis using an oxide or another metal salt, or a sol-gel synthesis of a metal alkoxide or the like, but is not limited to these manufacturing methods. In any case, the heat treatment is performed in an oxidizing atmosphere at 500 ° C. to 1600 ° C. for 5 to 30 hours. Heat treatment at a particularly low temperature is effective for increasing the specific surface area of the powder. If the heat treatment temperature is lower than 500 ° C., the crystallization is insufficient, and if it exceeds 1600 ° C., it becomes dense and unsuitable.
【００１４】[0014]
【作用】本発明によれば、本質的に、ＺｎとＧａとを主
構成金属元素として含むスピネル型複合酸化物をＮＯｘ
を含有する排ガスと接触させることにより、ＮＯｘを還
元分解し除去することができる。According to the present invention, a spinel-type composite oxide essentially containing Zn and Ga as main constituent metal elements is NOx
NOx can be reduced and decomposed and removed by contact with an exhaust gas containing.
【００１５】この還元分解のメカニズムは定かではない
が、ＺｎＯ単体のＮＯｘ還元分解作用よりも本発明のＮ
Ｏｘ還元分解作用で高い特性が得られていることから、
金属酸化物の複合化による金属元素の周囲の微妙な電子
状態の差がＮＯｘ還元分解特性に影響を与えていると考
えられる。Although the mechanism of this reductive decomposition is not clear, the present invention is more effective than the NOx reductive decomposition action of ZnO alone.
Since high characteristics are obtained by the Ox reductive decomposition action,
It is considered that a slight difference in electronic state around the metal element due to the compounding of the metal oxide affects the NOx reductive decomposition characteristics.
【００１６】[0016]
【実施例】出発原料として、Ｚｎ（ＮＯ3 ）2 ・６Ｈ2
Ｏ、Ｇａ（ＮＯ3 ）3 ・９Ｈ2 Ｏを用い、金属元素比が
１：２になるようにそれぞれ秤量した。蒸留水中に溶解
させ、撹拌しながらアンモニア水で中和した。生じた沈
澱物を濾過、洗浄し、凍結乾燥させた。乾燥した粉末を
７００℃で熱処理し、ＸＲＤにより結晶相を確認した。
なお、得られた粉末のＢＥＴ比表面積は１１．８ｍ2 ／
ｇであった。EXAMPLE As a starting material, Zn (NO 3 ) 2 .6H 2
O, Ga (NO 3) using the 3 · 9H 2 O, the metal element ratio of 1: were weighed respectively so as to 2. It was dissolved in distilled water and neutralized with aqueous ammonia with stirring. The resulting precipitate was filtered, washed and lyophilized. The dried powder was heat-treated at 700 ° C., and the crystal phase was confirmed by XRD.
The BET specific surface area of the obtained powder was 11.8 m 2 /
g.
【００１７】次に、得られた粉末を金型プレスにより成
型後、冷間静水圧成形法によりさらに圧縮成形し、その
成形物を解砕し４０メッシュパス、８０メッシュオンの
粉末に整粒した。ついで、この粉末を用いて、排ガスと
してＮＯ＝１０００ｐｐｍ、Ｏ2 ＝２％、Ｃ2 Ｈ4 ＝１
０００ｐｐｍ、Ｈｅ＝残部のガス、ＳＶ（空間速度）＝
１００００／ｈの条件で、２００℃から６００℃の範囲
でＮＯの還元分解能およびエチレンの還元分解能をガス
クロマトグラフを用いて測定し、ＮＯ転換率およびエチ
レン分解率と測定温度との関係を図２に示した。Next, the obtained powder was molded by a die press, and further compression molded by a cold isostatic pressing method, and the molded product was crushed and sized to a powder of 40 mesh pass and 80 mesh on. . Then, using this powder, NO = 1000 ppm, O 2 = 2%, C 2 H 4 = 1 as exhaust gas
000 ppm, He = remaining gas, SV (space velocity) =
Under the condition of 10,000 / h, the NO reduction ability and the ethylene reducing ability were measured using a gas chromatograph in the range of 200 ° C. to 600 ° C., and the relationship between the NO conversion rate and the ethylene decomposition rate and the measurement temperature was shown in FIG. Indicated.
【００１８】図２より明らかなように、５００℃におい
てＮＯ転換率が５６．４％を示した。触媒活性は３００
℃から観測され、６００℃でもＮＯの分解特性を示し、
触媒特性の温度領域が広いことがわかった。また、エチ
レンの分解率とＮＯ転換率との関係によれば、エチレン
の分解に対するＮＯの転換量が大きいため、効果的な触
媒材料であることがわかった。As is clear from FIG. 2, the NO conversion at 500 ° C. was 56.4%. The catalytic activity is 300
Observed from 600 ° C, even at 600 ° C
It was found that the temperature range of the catalyst characteristics was wide. Further, according to the relationship between the ethylene decomposition rate and the NO conversion rate, it was found that the conversion amount of NO with respect to the decomposition of ethylene was large, so that it was an effective catalyst material.
【００１９】[0019]
【発明の効果】以上、詳述した通り、本発明の酸化物触
媒材料は、高酸素濃度雰囲気下でもＮＯｘ還元分解作用
を有し、今後のディーゼルエンジンやリーンバーンエン
ジン等の燃焼機関の排気ガス等の浄化に有用なものであ
る。As described in detail above, the oxide catalyst material of the present invention has a NOx reduction / decomposition effect even in a high oxygen concentration atmosphere, and the exhaust gas of future combustion engines such as diesel engines and lean burn engines. It is useful for purification.
【図１】本発明における複合酸化物のＸ線回折チャート
である。FIG. 1 is an X-ray diffraction chart of a composite oxide according to the present invention.
【図２】本発明における触媒材料の測定時の温度とＮＯ
転換率、エチレン分解率との関係を示した図である。FIG. 2 shows the temperature and NO during measurement of the catalyst material in the present invention.
It is the figure which showed the relationship between conversion rate and ethylene decomposition rate.
Claims (3)
して含むスピネル型構造の複合酸化物からなる窒素酸化
物除去用酸化物触媒材料。1. An oxide catalyst material for removing nitrogen oxides, comprising a composite oxide having a spinel structure containing at least Zn and Ga as main metal elements.
る請求項１記載の窒素酸化物除去用酸化物触媒材料。2. The oxide catalyst material for removing nitrogen oxides according to claim 1, wherein said composite oxide is represented by ZnGa 2 O 4 .
が存在する酸化雰囲気中で、少なくともＺｎおよびＧａ
を主金属元素として含むスピネル型構造の複合酸化物と
窒素酸化物を含む排ガスと接触させることを特徴とする
窒素酸化物除去方法。3. In an oxidizing atmosphere containing an excess of oxygen and a reducing carbon-containing gas, at least Zn and Ga
A nitrogen oxide removal method, which comprises contacting a spinel-type composite oxide containing nitrogen as a main metal element with an exhaust gas containing nitrogen oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5174320A JP2851769B2 (en) | 1993-07-14 | 1993-07-14 | Oxide catalyst material for removing nitrogen oxides and method for removing nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5174320A JP2851769B2 (en) | 1993-07-14 | 1993-07-14 | Oxide catalyst material for removing nitrogen oxides and method for removing nitrogen oxides |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0724317A JPH0724317A (en) | 1995-01-27 |
| JP2851769B2 true JP2851769B2 (en) | 1999-01-27 |
Family
ID=15976587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5174320A Expired - Fee Related JP2851769B2 (en) | 1993-07-14 | 1993-07-14 | Oxide catalyst material for removing nitrogen oxides and method for removing nitrogen oxides |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2851769B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2718371B1 (en) * | 1994-04-08 | 1996-05-03 | Rhone Poulenc Chimie | Reduction catalysts for nitrogen oxides based on spinels. |
| CN111250075B (en) * | 2018-11-30 | 2021-04-23 | 中国科学院大连化学物理研究所 | Spherical ZnGa2O4Catalyst of nano particles and application thereof in preparation of low-carbon olefin by hydrogenation of carbon monoxide |
-
1993
- 1993-07-14 JP JP5174320A patent/JP2851769B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0724317A (en) | 1995-01-27 |
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