JP2892395B2 - Nitrogen oxide decomposition catalyst - Google Patents
Nitrogen oxide decomposition catalystInfo
- Publication number
- JP2892395B2 JP2892395B2 JP1238108A JP23810889A JP2892395B2 JP 2892395 B2 JP2892395 B2 JP 2892395B2 JP 1238108 A JP1238108 A JP 1238108A JP 23810889 A JP23810889 A JP 23810889A JP 2892395 B2 JP2892395 B2 JP 2892395B2
- Authority
- JP
- Japan
- Prior art keywords
- zeolite
- catalyst
- copper
- sio
- molar ratio
- 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 Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims description 44
- 239000003054 catalyst Substances 0.000 title claims description 27
- 238000000354 decomposition reaction Methods 0.000 title claims description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 27
- 239000010457 zeolite Substances 0.000 claims description 27
- 229910021536 Zeolite Inorganic materials 0.000 claims description 26
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 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
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 organic acid salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 1
- 239000005751 Copper oxide Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052675 erionite Inorganic materials 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 150000003840 hydrochlorides Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052680 mordenite Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- BGQMOFGZRJUORO-UHFFFAOYSA-M tetrapropylammonium bromide Chemical compound [Br-].CCC[N+](CCC)(CCC)CCC BGQMOFGZRJUORO-UHFFFAOYSA-M 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は窒素酸化物を含むガスから、それを分解によ
り除去する触媒に関する。さらに詳しくは窒素酸化物、
特に一酸化窒素を分解する触媒に関する。Description: TECHNICAL FIELD The present invention relates to a catalyst for removing a nitrogen oxide-containing gas from a gas by decomposition. More specifically, nitrogen oxides,
In particular, it relates to a catalyst for decomposing nitric oxide.
［従来の技術とその課題］ 環境保全の観点から、大気汚染物質の除去は大きな社
会的課題である。とりわけ産業活動の拡大に伴う燃焼廃
ガスの浄化は、現在の緊急課題である。固定発生源であ
る工場や、移動発生源である自動車から排出されるガス
中に含まれる窒素酸化物は、光化学スモッグの原因とい
われ人体に有害なガスである。特に一酸化窒素（NO）は
除去が困難で検討課題になっている。これまでにもいく
つかの方法が提案されている。例えば接触還元法と呼ば
れる方法は、アンモニアや水素などの還元剤を用い触媒
上でNOをN2とH2Oにして除去してやる方法である。しか
しながら還元剤を利用するため、その回収や漏れの対策
が必要で、大規模な固定発生源には有効であるが、自動
車のような発生源には適さない。一方排気ガス中に酸素
を殆ど含まない、還元雰囲気のガソリンエンジンからの
廃ガス浄化には、従来から種々の触媒が開発され一般に
使用されている。しかし、該触媒は酸素共存下では実用
に適さない。[Conventional technology and its problems] From the viewpoint of environmental protection, removal of air pollutants is a major social problem. In particular, purification of combustion waste gas accompanying the expansion of industrial activities is an urgent issue at present. Nitrogen oxides contained in gases emitted from factories that are stationary sources and automobiles that are mobile sources are said to cause photochemical smog and are harmful to the human body. In particular, it is difficult to remove nitric oxide (NO), which is an issue to be studied. Several methods have been proposed so far. For example, a method called a catalytic reduction method is a method of removing NO from N 2 and H 2 O on a catalyst using a reducing agent such as ammonia or hydrogen. However, since a reducing agent is used, it is necessary to take measures against its recovery and leakage, which is effective for large-scale fixed sources, but is not suitable for sources such as automobiles. On the other hand, various catalysts have been conventionally developed and generally used for purifying waste gas from a gasoline engine in a reducing atmosphere in which exhaust gas contains almost no oxygen. However, the catalyst is not suitable for practical use in the presence of oxygen.
ところでNOの接触分解、すなわちNOを直接N2とO2に分
解する方法は、排気ガスを触媒層に通ずるだけですみ極
めて簡便なため利用範囲は広い。これについてはPt、Cu
O、Co系触媒がNOの分解活性に効果があるが、いずれも
生成する酸素により被毒を受けるという問題があった。
デイーゼルエンジンの廃ガスは酸素を含むため、これら
の触媒では対応できず、新規な触媒の開発が要望されて
いる。By the way, the catalytic decomposition of NO, that is, the method of directly decomposing NO into N 2 and O 2 , requires only passage of the exhaust gas to the catalyst layer, and is extremely simple, and therefore has a wide range of applications. For this, Pt, Cu
O and Co-based catalysts have an effect on NO decomposition activity, but both have the problem of being poisoned by the generated oxygen.
Since the exhaust gas of diesel engines contains oxygen, these catalysts cannot cope with them, and there is a demand for the development of new catalysts.
前記の問題点の解決のためにいくつかの触媒が提案さ
れている。例えば特開昭60-125250号公報には、銅を含
む特異なゼオライトが酸素を含む系でNOの分解に有効で
あることが開示されている。該特許に開示のゼオライト
はSiO2/Al2O3のモル比が高い程結晶性がよいことが知ら
れている。しかしながらSiO2/Al2O3のモル比が高くなる
と活性が低下するという問題があり、そのために実際に
利用できるSiO2/Al2O3のモル比には限界があると考えら
れている。Several catalysts have been proposed to solve the above problems. For example, JP-A-60-125250 discloses that a unique zeolite containing copper is effective for decomposing NO in a system containing oxygen. It is known that the zeolite disclosed in the patent has higher crystallinity as the molar ratio of SiO 2 / Al 2 O 3 is higher. However, when the molar ratio of SiO 2 / Al 2 O 3 is increased, there is a problem that the activity is reduced. Therefore, it is considered that the molar ratio of SiO 2 / Al 2 O 3 that can be actually used is limited.
本発明の目的は、この点に関し結晶性のよい、すなわ
ちSiO2/Al2O3のモル比の高いゼオライトを用いて高活性
な一酸化窒素の分解触媒を提供することにある。An object of the present invention is to provide a highly active nitric oxide decomposition catalyst using a zeolite having good crystallinity in this regard, that is, a zeolite having a high SiO 2 / Al 2 O 3 molar ratio.
［課題を解決するための手段］ 本発明者らは前記目的の達成のために鋭意検討を行っ
た結果、SiO2/Al2O3のモル比の高いゼオライトでも銅を
所定量以上担持させれば高活性な触媒が得られることを
見いだし、本発明を完成するに至った。すなわち本発明
によれば、SiO2/Al2O3のモル比が100〜350のゼオライト
に銅を7.0〜20.0重量％担持することを特徴とする窒素
酸化物の分解触媒が提供される。Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, it has been found that even a zeolite having a high molar ratio of SiO 2 / Al 2 O 3 can support copper in a predetermined amount or more. It was found that a highly active catalyst could be obtained, and the present invention was completed. That is, according to the present invention, catalyst for decomposing nitrogen oxides molar ratio of SiO 2 / Al 2 O 3 is characterized in that 7.0 to 20.0 wt% on the copper zeolite 100-350 are provided.
［作用］ 一般にゼオライトとは結晶性アルミノ珪酸塩であり、
次の組成を有する。[Action] Generally, zeolite is a crystalline aluminosilicate,
It has the following composition:
XM2/nO・Al2O3・ySiO2・ZH2O （式中、ｎは陽イオンＭの原子価、Ｘは0.8〜2.0の範囲
の数、ｙは2.0以上の数、Ｚは０以上の数を示す） ゼオライトの基本構造はSi、Al、Ｏが規則正しく三次
元的に結合したもので、構造単位の違いにより種々の結
晶構造をとる。ゼオライトには多くの種類が知られてい
るが、Ｘ線解析によって特徴付けられ、その結晶構造に
より名称が異なる。例えば天然品としてモルデナイト、
エリオナイト、シヤバサイトがあり、合成品としてはＡ
型、Ｘ型、Ｙ型、ZSM−５などが知られている。本発明
ではZSM−５が好ましく用いられる。 XM 2 / n O · Al 2 O 3 · ySiO 2 · ZH 2 O ( wherein, n valence of the cation M, X is a number in the range of 0.8 to 2.0, y is 2.0 or more numbers, Z is 0 (The above numbers are shown.) The basic structure of zeolite is a structure in which Si, Al, and O are regularly and three-dimensionally bonded, and takes various crystal structures depending on the structural units. Although many types of zeolites are known, they are characterized by X-ray analysis and have different names depending on their crystal structures. For example, mordenite as a natural product,
There are erionite and shabasite.
Types, X type, Y type, ZSM-5 and the like are known. In the present invention, ZSM-5 is preferably used.
ゼオライトの合成は、適当なシリカ源、アルミナ源、
アルカリ源を混合し、100〜250℃程度の水熱条件下で結
晶化させることにより容易に得られる。また前記の混合
物にテンプレートと呼ばれる有機物を添加して水熱合成
しても得られる。The synthesis of the zeolite is carried out using a suitable silica source, alumina source,
It is easily obtained by mixing an alkali source and crystallizing it under hydrothermal conditions of about 100 to 250 ° C. It can also be obtained by adding an organic substance called a template to the above mixture and performing hydrothermal synthesis.
本発明において、銅のゼオライト中への導入方法は特
に限定されない。ゼオライト中のカチオンと目的とする
金属カチオンを交換するイオン交換法や、ゼオライトを
目的とする金属を含む溶液中に浸漬する含浸法などが挙
げられる。好ましくはゼオライトを銅溶液に分散し、そ
の中にアルカリ性の溶液を添加してpHを調製することで
ある。本発明で用いる銅の原料化合物の種類は問わな
い。例えば硫酸塩、塩酸塩、硝酸塩、有機酸塩、金属複
合塩などである。In the present invention, the method of introducing copper into zeolite is not particularly limited. Examples include an ion exchange method in which cations in zeolite are exchanged with a target metal cation, and an impregnation method in which zeolite is immersed in a solution containing a target metal. Preferably, the pH is adjusted by dispersing the zeolite in a copper solution and adding an alkaline solution therein. The type of the copper raw material compound used in the present invention is not limited. For example, sulfates, hydrochlorides, nitrates, organic acid salts, metal complex salts, and the like.
本発明に用いるゼオライトのSiO2/Al2O3のモル比は10
0〜350、好ましくは110〜300である。該モル比が100よ
り小さいとゼオライトの結晶性が悪くなり、一方該モル
比が350を超えると活性が低くなる。The zeolite used in the present invention has a SiO 2 / Al 2 O 3 molar ratio of 10
It is 0 to 350, preferably 110 to 300. If the molar ratio is less than 100, the crystallinity of the zeolite deteriorates, while if the molar ratio exceeds 350, the activity decreases.
本発明において、ゼオライトに担持する銅の担持量は
5.0〜30.0重量％、好ましくは7.0〜20.0重量％である。In the present invention, the amount of copper supported on zeolite is
It is 5.0 to 30.0% by weight, preferably 7.0 to 20.0% by weight.
銅の担持量が5.0重量％より少ないと一酸化窒素の分
解活性点が少なく、十分な分解活性を示さない。30重量
％を超えると活性に関与しない酸化銅が増加し、それが
活性点を被覆したりするため活性が低下する。If the supported amount of copper is less than 5.0% by weight, the active site for decomposing nitric oxide is small, and sufficient decomposing activity is not exhibited. When the content exceeds 30% by weight, copper oxide not involved in the activity increases, and the activity covers the active site, and the activity decreases.
本発明の触媒の使用温度は300〜800℃、好ましくは40
0〜700℃である。また本触媒と処理ガスとの接触時間は
特に限定されない。The operating temperature of the catalyst of the present invention is 300 to 800 ° C., preferably 40 to 800 ° C.
0-700 ° C. The contact time between the catalyst and the processing gas is not particularly limited.
本発明の触媒の工業的使用方法は、触媒を適当な形状
に成形して反応装置に充填することが挙げられる。例え
ばシリカ・アルミナ等のような無機酸化物や粘土をバイ
ンダーとして球状、柱状、ハニカム状にすることが考え
られる。またゼオライトを銅導入以前に成形しておき、
その後銅を導入する方法もある。いずれにしても特に限
定されるものではない。An industrial method for using the catalyst of the present invention is to form the catalyst into an appropriate shape and fill the reactor. For example, a spherical, columnar, or honeycomb shape can be considered using an inorganic oxide such as silica or alumina or clay as a binder. Also, zeolite is molded before introducing copper,
Thereafter, there is a method of introducing copper. In any case, there is no particular limitation.
［実施例］ 以下、実施例により本発明をさらに具体的に説明す
る。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples.
実施例１（ゼオライトの合成） 水ガラス３号と、硫酸アルミニウムおよび硫酸、テト
ラプロピルアンモニウムブロマイドを含む溶液を所定の
割合で混合、pHを約9.5に調整した。得られたゲルをオ
ートクレーブ中で150℃で50時間水熱処理した。その後
ゲルを取り出し乾燥後550℃にて20時間焼成した。SiO2/
Al2O3のモル比は元素分析で求め、結晶化度はＸ線分析
で決定した。また、窒素吸着法でゼオライトの全表面積
を求めた。結果を第１表に示した。表から明らかなよう
に、SiO2/Al2O3のモル比が高いほど結晶性がよいことが
分かる。Example 1 (Synthesis of zeolite) Waterglass No. 3 and a solution containing aluminum sulfate, sulfuric acid, and tetrapropylammonium bromide were mixed at a predetermined ratio, and the pH was adjusted to about 9.5. The obtained gel was subjected to hydrothermal treatment in an autoclave at 150 ° C. for 50 hours. Thereafter, the gel was taken out, dried and calcined at 550 ° C. for 20 hours. SiO 2 /
The molar ratio of Al 2 O 3 was determined by elemental analysis, and the crystallinity was determined by X-ray analysis. Further, the total surface area of the zeolite was determined by a nitrogen adsorption method. The results are shown in Table 1. As is clear from the table, the higher the molar ratio of SiO 2 / Al 2 O 3 , the better the crystallinity.
実施例２ SiO2/Al2O3のモル比が125のZSM−５ゼオライトを濃度
の異なる硝酸銅を含む溶液に分散し、アンモニウム溶液
を少量ずつ滴下してpHを7.5に調節した。その後、ゼオ
ライトを濾過しイオン交換水で十分洗浄した。得られた
ゼオライトを減圧乾燥後、さらに100℃で３時間乾燥し
た。かくして触媒Ａ〜Ｆを得た。得られた触媒を500℃
で焼成し、それにつき原子吸光法で銅の担持量を求め
た。 Example 2 ZSM-5 zeolite having a molar ratio of SiO 2 / Al 2 O 3 of 125 was dispersed in a solution containing copper nitrate having different concentrations, and the pH was adjusted to 7.5 by dropwise addition of an ammonium solution little by little. Thereafter, the zeolite was filtered and sufficiently washed with ion-exchanged water. The obtained zeolite was dried under reduced pressure, and further dried at 100 ° C. for 3 hours. Thus, catalysts A to F were obtained. 500 ° C of the obtained catalyst
And the amount of copper carried was determined by atomic absorption spectrometry.
評価例 触媒を打錠成形後、砕いて粒径を揃えたもので反応評
価を行った。すなわち、触媒1.0gを流通式の反応器に入
れ、Heを流しながら徐々に昇温して500℃にした。そこ
で一酸化窒素5000ppmを含むHeを流し、生成物をガスク
ロマトグラフイーで分析した。分析値は反応後2.0時間
経過したものである。Evaluation Example After tablet-molding the catalyst, the catalyst was crushed and the particle size was adjusted to evaluate the reaction. That is, 1.0 g of the catalyst was placed in a flow-type reactor, and the temperature was gradually raised to 500 ° C. while flowing He. Therefore, He containing 5000 ppm of nitric oxide was flowed, and the product was analyzed by gas chromatography. The analytical value is 2.0 hours after the reaction.
結果を第２表に示した。 The results are shown in Table 2.
第２表に示すように銅担持量が5.0重量％を超えるこ
とが望ましい。 As shown in Table 2, it is desirable that the amount of supported copper exceeds 5.0% by weight.
実施例３ SiO2/Al2O3のモル比の異なるゼオライトを硝酸銅溶液
に分散し、水酸化ナトリウム溶液を少量ずつ滴下してpH
を7.5に調節した。その後、ゼオライトを濾過しイオン
交換水で十分洗浄した。得られたゼオライトを減圧乾燥
後、さらに100℃で３時間乾燥した。かくして触媒Ｇ〜
Ｋを得た。Example 3 Zeolite having different molar ratios of SiO 2 / Al 2 O 3 was dispersed in a copper nitrate solution, and sodium hydroxide solution was added dropwise little by little to adjust the pH.
Was adjusted to 7.5. Thereafter, the zeolite was filtered and sufficiently washed with ion-exchanged water. The obtained zeolite was dried under reduced pressure, and further dried at 100 ° C. for 3 hours. Thus, catalyst G ~
K was obtained.
この触媒を前記の評価例と同一の方法で活性を測定し
た。結果を第３表に示した。The activity of this catalyst was measured in the same manner as in the evaluation example described above. The results are shown in Table 3.
第３表に示すようにSiO2/Al2O3が125の触媒は優れた
活性を示す。 As shown in Table 3 , the catalyst with 125 SiO 2 / Al 2 O 3 shows excellent activity.
［発明の効果］ 本発明の触媒を使用することにより、一酸化窒素の濃
度が低いガスからも効率よく一酸化窒素を除去できる。[Effect of the Invention] By using the catalyst of the present invention, nitric oxide can be efficiently removed even from a gas having a low concentration of nitric oxide.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 章 神奈川県横浜市神奈川区三ツ沢東町３― 27 (56)参考文献 特開 平１−96011（ＪＰ，Ａ) 特開 平３−86213（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B01J 29/46 B01D 53/86 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Inoue 3-27 Mitsuzawa Higashicho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-1-96011 (JP, A) JP-A-3-86213 (JP, A) (58) Field surveyed (Int. Cl. 6 , DB name) B01J 29/46 B01D 53/86
Claims (1)
トに銅を7.0〜20.0重量％担持することを特徴とする窒
素酸化物の分解触媒。1. A nitrogen oxide decomposition catalyst, wherein 7.0 to 20.0% by weight of copper is supported on zeolite having a SiO 2 / Al 2 O 3 molar ratio of 110 to 300.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238108A JP2892395B2 (en) | 1989-09-13 | 1989-09-13 | Nitrogen oxide decomposition catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238108A JP2892395B2 (en) | 1989-09-13 | 1989-09-13 | Nitrogen oxide decomposition catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03131344A JPH03131344A (en) | 1991-06-04 |
| JP2892395B2 true JP2892395B2 (en) | 1999-05-17 |
Family
ID=17025297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1238108A Expired - Fee Related JP2892395B2 (en) | 1989-09-13 | 1989-09-13 | Nitrogen oxide decomposition catalyst |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2892395B2 (en) |
-
1989
- 1989-09-13 JP JP1238108A patent/JP2892395B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03131344A (en) | 1991-06-04 |
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