JPS63242347A - Nitrogen dioxide removing agent and method therefor - Google Patents
Nitrogen dioxide removing agent and method thereforInfo
- Publication number
- JPS63242347A JPS63242347A JP62079310A JP7931087A JPS63242347A JP S63242347 A JPS63242347 A JP S63242347A JP 62079310 A JP62079310 A JP 62079310A JP 7931087 A JP7931087 A JP 7931087A JP S63242347 A JPS63242347 A JP S63242347A
- Authority
- JP
- Japan
- Prior art keywords
- nitrogen dioxide
- removing agent
- nitrogen
- gas
- carbon
- 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.)
- Granted
Links
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 25
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 title claims description 60
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 title claims description 60
- 238000000034 method Methods 0.000 title claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 16
- 229910052723 transition metal Inorganic materials 0.000 claims abstract description 11
- 150000003624 transition metals Chemical class 0.000 claims abstract description 10
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 8
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 8
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 229910001849 group 12 element Inorganic materials 0.000 claims 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000395 magnesium oxide Substances 0.000 abstract 1
- 229910010271 silicon carbide Inorganic materials 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000001272 nitrous oxide Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-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
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- AERUOEZHIAYQQL-UHFFFAOYSA-K cerium(3+);triacetate;hydrate Chemical compound O.[Ce+3].CC([O-])=O.CC([O-])=O.CC([O-])=O AERUOEZHIAYQQL-UHFFFAOYSA-K 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229940076286 cupric acetate Drugs 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- UOGMEBQRZBEZQT-UHFFFAOYSA-L manganese(2+);diacetate Chemical compound [Mn+2].CC([O-])=O.CC([O-])=O UOGMEBQRZBEZQT-UHFFFAOYSA-L 0.000 description 1
- CESXSDZNZGSWSP-UHFFFAOYSA-L manganese(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Mn+2].CC([O-])=O.CC([O-])=O CESXSDZNZGSWSP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- -1 transition metal acetate Chemical class 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
Description
【発明の詳細な説明】
イ、産業上の利用分野
本発明は二酸化窒素除去剤及び二酸化窒素除去方法に関
する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a nitrogen dioxide removal agent and a nitrogen dioxide removal method.
口、従来技術
環境保全のため、廃ガス中に含まれる窒素酸化物（ＮＯ
ｖ）は大気中への放出の際、窒素に還元して無害化する
必要がある。Conventional technologyIn order to protect the environment, nitrogen oxides (NO
v) must be reduced to nitrogen and rendered harmless when released into the atmosphere.
廃ガス中に含まれる窒素酸化物を乾式で除去する方法と
して、アンモニア（ＮＨ３）を用いる所。Places where ammonia (NH3) is used as a dry method for removing nitrogen oxides contained in waste gas.
謂アンモニア還元法がある。この方法を例えば全尿酸洗
工場や硝酸プラントから排出される廃ガスのような二酸
化窒素（ＮＯ２）濃度の高い廃ガスの処理に適用すると
、多量の亜酸化窒素（Ｎ２０）が発生して無害化が達成
されないという問題がある。また、アンモニアを還元ガ
スとして使用できない室内排気型の燃焼装置等に於いて
は、二酸化窒素還元能を有する金属が触媒として使用さ
れるが、これを酸素のような酸化性ガスを含有する廃ガ
スの還元に使用すると、使用中に金属の表面の酸化が進
行してその還元能力が次第に低下していくという欠点が
あり、酸素共存下でのＮＯ２還元触媒及び除去剤の開発
が望まれていた。There is a so-called ammonia reduction method. When this method is applied to the treatment of waste gas with a high concentration of nitrogen dioxide (NO2), such as waste gas discharged from a whole urine pickling factory or a nitric acid plant, a large amount of nitrous oxide (N20) is generated and becomes harmless. The problem is that this is not achieved. In addition, in indoor exhaust-type combustion equipment that cannot use ammonia as a reducing gas, metals that have the ability to reduce nitrogen dioxide are used as catalysts. When used to reduce NO2, there is a drawback that oxidation of the metal surface progresses during use and its reducing ability gradually decreases, so there has been a desire to develop a NO2 reduction catalyst and removal agent in the coexistence of oxygen. .
ハ８発明の目的
本発明は、上記の事情に鑑みてなされたものであって、
廃ガス中の二酸化窒素を４００℃以下の低温で除去でき
、また廃ガス中に酸素のような酸化性ガスが含まれてい
ても、二酸化窒素除去能力の低下の少ない二酸化窒素除
去剤及び二酸化窒素除去方法を提供することを目的とし
ている。C.8 Purpose of the Invention The present invention has been made in view of the above circumstances, and includes:
Nitrogen dioxide remover and nitrogen dioxide that can remove nitrogen dioxide in waste gas at a low temperature of 400°C or less, and that has little reduction in nitrogen dioxide removal ability even if the waste gas contains oxidizing gases such as oxygen. The purpose is to provide a method of removal.
二９発明の構成
即ち、本発明の第一の発明は、炭素を主成分とし、アル
カリ金属の１種又は２種以上と、周期表ｎＢ族元素をも
含む遷移金属及び錫からなる群から選ばれた１種又は２
種以上とを含有する二酸化窒素除去剤に係る。29, that is, the first invention of the present invention is characterized in that the main component is carbon, selected from the group consisting of one or more alkali metals, a transition metal including an element of group nB of the periodic table, and tin. type 1 or 2
This relates to a nitrogen dioxide removing agent containing at least one species.
また、本発明の第二の発明は、上記第一の発明に係る二
酸化窒素除去剤を使用し、室温〜４００℃の範囲内の温
度で酸化性ガスを含むガス中の二酸化窒素を除去する、
二酸化窒素除去方法に係る。Further, a second invention of the present invention uses the nitrogen dioxide removing agent according to the first invention to remove nitrogen dioxide from a gas containing an oxidizing gas at a temperature within the range of room temperature to 400°C.
Relating to a nitrogen dioxide removal method.
上記炭素としては、黒鉛、石炭、木炭、微品質炭素或い
は炭素を主成分とする物質が含まれ、中でも微品質炭素
に属する活性炭が好ましい。The above-mentioned carbon includes graphite, coal, charcoal, fine carbon, or a substance containing carbon as a main component, and activated carbon, which belongs to fine carbon, is particularly preferable.
上記遷移金属は、周期表ｎＢ族金屈をも含む範囲である
。The range of the above-mentioned transition metals includes metals of the nB group of the periodic table.
ホ９発明の作用効果
本発明に基づく二酸化窒素除去剤は、室温〜４００℃の
範囲内の温度でガス中の二酸化窒素除去に特に効果があ
り、酸素のような酸化性ガスが含まれていても、その効
果の低減は少ない。室温〜１５０℃の低温域では二酸化
窒素の吸着及び／又は二酸化窒素（ＮＯ２）から−酸化
窒素（ＮＯ）への還元による二酸化窒素除去作用が顕著
であり、１５０〜４００℃の範囲内の比較的高温では二
酸化窒素（ＮＯ２）から−酸化窒素（ＮＯ）及び／又は
窒素（Ｎ２）迄の還元が進行し環境保全上極めて有効で
ある。この特異な効果は、アルカリ金属担持の炭素によ
る窒素酸化物の吸着、分解作用と遷移金属の還元作用と
の相乗効果により、更に強められているものと考えられ
る。E9 Effects of the Invention The nitrogen dioxide removing agent based on the present invention is particularly effective in removing nitrogen dioxide from gas at temperatures within the range of room temperature to 400°C, and contains oxidizing gases such as oxygen. However, the reduction in effect is small. In the low temperature range from room temperature to 150°C, the nitrogen dioxide removal effect by adsorption of nitrogen dioxide and/or reduction of nitrogen dioxide (NO2) to -nitrogen oxide (NO) is remarkable; At high temperatures, reduction of nitrogen dioxide (NO2) to -nitrogen oxide (NO) and/or nitrogen (N2) progresses, which is extremely effective for environmental conservation. This unique effect is thought to be further enhanced by the synergistic effect of the adsorption and decomposition of nitrogen oxides by the alkali metal-supported carbon and the reducing action of the transition metal.
また、本発明に基づく二酸化窒素除去剤は、シリカ（Ｓ
Ｉ Ｏ２） 、アルミナ（Ａｊ！２０３）、マグネシ
ア（ＭｇＯ）、炭化珪素（ＳｉＣ）、チタニア（Ｔｉ０
２）等の耐熱セラミックスに担持させると、１５０〜４
００℃の比較的高温域での二酸化窒素還元に際し、ガス
中に含まれる酸素等の酸化性ガスによる着火が有効に抑
止される。In addition, the nitrogen dioxide removing agent based on the present invention includes silica (S
I O2), alumina (Aj!203), magnesia (MgO), silicon carbide (SiC), titania (Ti0
When supported on heat-resistant ceramics such as 2), 150-4
During nitrogen dioxide reduction in a relatively high temperature range of 00°C, ignition by oxidizing gas such as oxygen contained in the gas is effectively suppressed.
なお、酸素等の酸化性ガスを含むガスを４００℃を越え
る高温域で処理する場合は、二酸化窒素除去剤が着火す
る虞れがある。４００℃近傍のガスを処理する場合は、
二酸化窒素除去剤の表面酸化による安定化処理によって
、或いはこの安定化処理に更に上記耐熱セラミックスに
よる安定化を複合させて、二酸化窒素除去剤の耐熱性を
向上させて使用することができる。Note that when a gas containing an oxidizing gas such as oxygen is processed at a high temperature range exceeding 400° C., there is a risk that the nitrogen dioxide removing agent will ignite. When processing gas near 400℃,
The heat resistance of the nitrogen dioxide removing agent can be improved and used by stabilizing the nitrogen dioxide removing agent by surface oxidation, or by combining this stabilizing treatment with the above-mentioned stabilization using heat-resistant ceramics.
へ、実施例 以下、実施例を挙げて本発明の詳細な説明する。To, Example Hereinafter, the present invention will be explained in detail with reference to Examples.
まず、炭素にアルカリ金属や遷移金属を添加する方法に
ついて説明する。First, a method of adding an alkali metal or a transition metal to carbon will be explained.
炭素にアルカリ金属を添加するには、アルカリ金属の炭
酸塩、硝酸塩、酢酸塩、水酸化物等の溶液中に炭素を浸
漬する方法によることができる。An alkali metal can be added to carbon by a method of immersing carbon in a solution of an alkali metal carbonate, nitrate, acetate, hydroxide, or the like.
更に遷移金属を添加するには、遷移金属の酢酸塩、炭酸
塩、硝酸塩、水酸化物等の溶液中にアルカリ金属を担持
させた炭素を浸漬してから乾燥する。To further add a transition metal, carbon carrying an alkali metal is immersed in a solution of a transition metal acetate, carbonate, nitrate, hydroxide, etc., and then dried.
上記塩の形態の選択によっては、アルカリ金泥と遷移金
属とを同時に炭素に添加することも可能である。また、
フェロシアン化アルカリ等の溶液に炭素を浸漬し、乾燥
する方法によることもできる。Depending on the selection of the form of the salt, it is also possible to add the alkali gold mud and the transition metal to the carbon at the same time. Also,
It is also possible to immerse carbon in a solution such as alkali ferrocyanide and dry it.
次に、具体的な実施例を説明する。Next, a specific example will be described.
市販の活性炭を炭酸カリウム（Ｋ２ＣＯ３）水溶液に浸
漬し乾燥させた後、酢酸セリウム１水塩（Ｃｅ （ＣＨ
３ＣＯＯ）ｓ ・ＨｚＯ）と酢酸第一マンガン四水塩（
Ｍｎ （ＣＨ３Ｃｏｏ）２ ・４Ｈ２０）との混合水溶
液に浸漬し再び乾燥して二酸化窒素除去剤とした（実施
例１）。After immersing commercially available activated carbon in an aqueous potassium carbonate (K2CO3) solution and drying it, cerium acetate monohydrate (Ce (CH
3COO)s HzO) and manganous acetate tetrahydrate (
It was immersed in a mixed aqueous solution of Mn (CH3Coo)2 4H20) and dried again to obtain a nitrogen dioxide removing agent (Example 1).
市販の活性炭を炭酸カリウム水溶液に浸漬し乾燥させた
後、酢酸第二銅無水塩（Ｃｕ （ＣＨ３ＣＯＯ）２）と
酢酸第一マンガン無水塩（Ｍｎ （ＣＨ３Ｃｏｏ）２）
の混合水溶液に浸漬し再び乾燥して二酸化窒素除前記実
施例１の二酸化窒素除去剤と市販の触媒担体用γ−アル
ミナとを容積比で（Ｃ：Ａｊ？ｚＯ３）＝ （１： ５
）の割合で混練し、無機バインダを用いて錠剤成形機に
て直径６＋ｎ、Ｔ！！−さ２鶴のタブレット状二酸化窒
素除去剤とした（実施例５）。After soaking commercially available activated carbon in an aqueous potassium carbonate solution and drying it, cupric acetate anhydrous (Cu (CH3COO)2) and manganous acetate anhydrous (Mn (CH3Coo)2) were added.
The nitrogen dioxide removing agent of Example 1 and the commercially available γ-alumina for catalyst carrier were mixed in a volume ratio of (C:Aj?zO3)=(1:5).
) in a tablet molding machine using an inorganic binder to form a tablet with a diameter of 6+n and T! ! - It was made into a tablet-shaped nitrogen dioxide removing agent of Sanikatsuru (Example 5).
これらの二酸化窒素除去剤について、次のような試験に
よって二酸化窒素除去能力の評価を行った。The nitrogen dioxide removal ability of these nitrogen dioxide removing agents was evaluated by the following tests.
各二酸化窒素除去剤について、見掛は体積６ ｍ ｌを
固定床流動型反応試験装置にセットし、下記表に示す組
成のガスを室温〜３５０℃の範囲内の所定温度に保持さ
れた二酸化窒素除去剤中に連続通気し、通過ガスの分析
を行った。二酸化窒素（ＮＯ２）と−酸化窒素（ＮＯ）
の連続分析は化学発光法により、窒素（Ｎ２）、亜酸化
窒素（Ｎ２０）の分析はガスクロマトグラフによった。For each nitrogen dioxide removing agent, an apparent volume of 6 ml was set in a fixed bed fluidized reaction test apparatus, and a gas having the composition shown in the table below was heated to nitrogen dioxide maintained at a predetermined temperature within the range of room temperature to 350°C. Continuous ventilation was carried out through the removal agent, and the gas passing through was analyzed. Nitrogen dioxide (NO2) and -nitrogen oxide (NO)
The continuous analysis of nitrogen (N2) and nitrous oxide (N20) was carried out by chemiluminescence method, and the analysis of nitrogen (N2) and nitrous oxide (N20) was carried out by gas chromatography.
但し、空間速度Ｓ、Ｖ、はいずれも２００００ ｈｒ’
である。However, the spatial velocities S and V are both 20000 hr'
It is.
表 （容積比） 分析結果は第１図に示す通りである。Table (volume ratio) The analysis results are shown in Figure 1.
各温度共、二酸化窒素の分解による生成物は一酸化窒素
（ＮＯ）及び窒素（Ｎ２）であって、亜酸化窒素（Ｎ
ｚ Ｏ）及び未分解の二酸化窒素は通も微量であって、
二酸化窒素の殆ど大部分が窒素に還元されている。At each temperature, the products of decomposition of nitrogen dioxide are nitric oxide (NO) and nitrogen (N2), and nitrous oxide (N
z O) and undecomposed nitrogen dioxide are in trace amounts,
Most of the nitrogen dioxide is reduced to nitrogen.
各実施例共、１５０℃以下では二酸化窒素の除去剤への
吸着による除去効果が大きく、測定された時間（約１０
時間）では二酸化窒素が吸着され、一部が一酸化窒素と
して脱離するだけで、二酸化窒素は殆ど除去される。１
５０℃以上になると、二酸化窒素は一酸化窒素及び／又
は窒素迄の還元が主となって二酸化窒素が除去される。In each example, at 150°C or lower, the removal effect due to nitrogen dioxide adsorption to the removal agent was large, and the measured time (approximately 10
time), nitrogen dioxide is adsorbed, and only a portion is desorbed as nitrogen monoxide; most of the nitrogen dioxide is removed. 1
When the temperature reaches 50° C. or higher, nitrogen dioxide is mainly reduced to nitrogen monoxide and/or nitrogen, and nitrogen dioxide is removed.
第２図は、１５０〜３５０℃の二酸化窒素除去特性とし
ての二酸化窒素の一酸化窒素及び窒素への転化率を示す
グラフである。第２図では二酸化窒素の吸着による除去
は含まれておらず、実際の二酸化窒素除去率は極めて高
いものである。FIG. 2 is a graph showing the conversion rate of nitrogen dioxide to nitrogen monoxide and nitrogen as nitrogen dioxide removal characteristics at 150 to 350°C. Figure 2 does not include the removal of nitrogen dioxide by adsorption, and the actual nitrogen dioxide removal rate is extremely high.
実施例１．２は、２５０℃以上で使用するときは酸素等
の酸化性ガスによって予め表面酸化処理を施してから使
用した。而も、高温ではこれらの二酸化窒素除去剤は、
第１図の結果から判るように、窒素迄の還元能力が更に
高まるという特徴を持っている。In Example 1.2, when used at 250° C. or higher, the surface was subjected to surface oxidation treatment with an oxidizing gas such as oxygen before use. However, at high temperatures, these nitrogen dioxide removers
As can be seen from the results in Figure 1, it has the characteristic of further increasing the ability to reduce nitrogen.
図面はいずれも本発明の実施例を示すものであって、
第１図は反応温度と発生するＮｏガスの分析結果との関
係を示すグラフ、
第２図は反応温度と二酸化窒素転化率との関係を示すグ
ラフ
である。The drawings all show examples of the present invention. Figure 1 is a graph showing the relationship between the reaction temperature and the analysis results of NO gas generated, and Figure 2 is a graph showing the relationship between the reaction temperature and the nitrogen dioxide conversion rate. It is a graph showing a relationship.
Claims (4)
上と、周期表IIＢ族元素をも含む遷移金属及び錫からな
る群から選ばれた１種又は２種以上とを含有する二酸化
窒素除去剤。1. A nitrogen dioxide removal agent that has carbon as its main component and contains one or more alkali metals and one or more selected from the group consisting of tin and transition metals that also include Group IIB elements of the periodic table. .
囲第１項記載の二酸化窒素除去剤。2. The nitrogen dioxide removing agent according to claim 1, which is supported on heat-resistant ceramics.
上と、周期表IIＢ族元素をも含む遷移金属及び錫からな
る群から選ばれた１種又は２種以上とを含有する二酸化
窒素除去剤を使用し、室温〜４００℃の範囲内の温度で
酸化性ガスを含むガス中の二酸化窒素を除去する、二酸
化窒素除去方法。3. A nitrogen dioxide removal agent that has carbon as its main component and contains one or more alkali metals and one or more selected from the group consisting of tin and transition metals that also include Group IIB elements of the periodic table. A method for removing nitrogen dioxide, which removes nitrogen dioxide from a gas containing an oxidizing gas at a temperature in the range of room temperature to 400°C.
れた二酸化窒素除去剤を使用する、特許請求の範囲第３
項記載の二酸化窒素除去方法。4. Claim 3 uses a nitrogen dioxide removing agent supported on heat-resistant ceramics as the nitrogen dioxide removing agent.
Nitrogen dioxide removal method described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62079310A JPH06201B2 (en) | 1987-03-31 | 1987-03-31 | Nitrogen dioxide reducing agent and method for reducing nitrogen dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62079310A JPH06201B2 (en) | 1987-03-31 | 1987-03-31 | Nitrogen dioxide reducing agent and method for reducing nitrogen dioxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63242347A true JPS63242347A (en) | 1988-10-07 |
| JPH06201B2 JPH06201B2 (en) | 1994-01-05 |
Family
ID=13686282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62079310A Expired - Lifetime JPH06201B2 (en) | 1987-03-31 | 1987-03-31 | Nitrogen dioxide reducing agent and method for reducing nitrogen dioxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06201B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5108977A (en) * | 1987-03-31 | 1992-04-28 | Kabushiki Kaisha Riken | Catalyst for cleaning exhaust gas |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49187A (en) * | 1972-04-19 | 1974-01-05 | ||
| JPS62193633A (en) * | 1986-02-21 | 1987-08-25 | Riken Corp | Reducing agent for nitrogen oxide |
| JPS63171623A (en) * | 1986-12-30 | 1988-07-15 | Riken Corp | Removing method for nitrogen oxide |
-
1987
- 1987-03-31 JP JP62079310A patent/JPH06201B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49187A (en) * | 1972-04-19 | 1974-01-05 | ||
| JPS62193633A (en) * | 1986-02-21 | 1987-08-25 | Riken Corp | Reducing agent for nitrogen oxide |
| JPS63171623A (en) * | 1986-12-30 | 1988-07-15 | Riken Corp | Removing method for nitrogen oxide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5108977A (en) * | 1987-03-31 | 1992-04-28 | Kabushiki Kaisha Riken | Catalyst for cleaning exhaust gas |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06201B2 (en) | 1994-01-05 |
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