JPH0957097A - Ammonia decomposing agent - Google Patents
Ammonia decomposing agentInfo
- Publication number
- JPH0957097A JPH0957097A JP7250042A JP25004295A JPH0957097A JP H0957097 A JPH0957097 A JP H0957097A JP 7250042 A JP7250042 A JP 7250042A JP 25004295 A JP25004295 A JP 25004295A JP H0957097 A JPH0957097 A JP H0957097A
- Authority
- JP
- Japan
- Prior art keywords
- ammonia
- reaction
- manganese oxide
- decomposing agent
- agent
- 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
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 24
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 9
- 239000010949 copper Substances 0.000 description 6
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000012286 potassium permanganate Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- YMKHJSXMVZVZNU-UHFFFAOYSA-N manganese(2+);dinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YMKHJSXMVZVZNU-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229940116318 copper carbonate Drugs 0.000 description 1
- GEZOTWYUIKXWOA-UHFFFAOYSA-L copper;carbonate Chemical compound [Cu+2].[O-]C([O-])=O GEZOTWYUIKXWOA-UHFFFAOYSA-L 0.000 description 1
- SXTLQDJHRPXDSB-UHFFFAOYSA-N copper;dinitrate;trihydrate Chemical compound O.O.O.[Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O SXTLQDJHRPXDSB-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- -1 factory exhaust gas Chemical compound 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229940093474 manganese carbonate Drugs 0.000 description 1
- 235000006748 manganese carbonate Nutrition 0.000 description 1
- 239000011656 manganese carbonate Substances 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 1
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、大気中あるいは各
種工場等の排ガス中に含まれるアンモニアを効率よく除
去することが出来るアンモニア分解剤に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia decomposing agent capable of efficiently removing ammonia contained in the air or exhaust gas from various factories.
【０００２】[0002]
【従来の技術】法定悪臭８大物質であるアンモニアは従
来、水あるいは酸性溶液に吸収させる湿式法、あるいは
添着活性炭などを用いた吸着法、あるいは貴金属系触媒
などにより酸化分解するなどの方法で処理されてきた。
しかし、これらの方法はいずれもいくつかの問題点を有
していた。すなわち湿式法は、工場排ガスなど比較的高
濃度のアンモニアを処理するのに好適であるが、排水処
理などを含め設備費が高くなる。吸着法はこれらの問題
はないが、吸着効率が十分でなく、又、吸着層に吸着熱
が蓄熱して昇温し、発火するなどの危険性を有してい
る。又、酸化分解法は、その生成物はＮＯ２などの窒素
化合物となり好ましくない。2. Description of the Related Art Ammonia, which is the eight major substances with a legal odor, is conventionally treated by a wet method of absorbing it in water or an acidic solution, an adsorption method using impregnated activated carbon, or a method of oxidative decomposition using a noble metal catalyst. It has been.
However, all of these methods have some problems. That is, the wet method is suitable for treating relatively high-concentration ammonia such as factory exhaust gas, but the equipment cost including wastewater treatment is high. Although the adsorption method does not have these problems, it does not have sufficient adsorption efficiency and has a risk that the adsorption heat accumulates in the adsorption layer to raise the temperature and cause ignition. Further, the oxidative decomposition method is not preferable because the product thereof becomes a nitrogen compound such as NO 2 .
【０００３】[0003]
【発明が解決しようとする課題】本発明はかかる問題を
解決するためになされたものであって、アンモニアをＮ
ＯＸを殆ど生成することなく効率よく分解除去するため
の分解剤の提供を目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, in which ammonia is added as N 2
An object of the present invention is to provide a decomposing agent for efficiently decomposing and removing almost no O X.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、Ｘ線の
最大強度の回析角度（２θ）が３７±１゜である酸化マ
ンガンを主成分とするアンモニア分解剤であり、Ｘ線の
最大強度の回析角度（２θ）が３７±１゜であってＣｕ
及び／又はＦｅを含有する酸化マンガンを主成分とする
アンモニア分解剤である。The gist of the present invention is an ammonia decomposing agent containing manganese oxide as a main component, which has a diffraction angle (2θ) of the maximum X-ray intensity of 37 ± 1 °. The maximum intensity diffraction angle (2θ) is 37 ± 1 ° and Cu
And / or an ammonia decomposing agent whose main component is manganese oxide containing Fe.
【０００５】上記酸化マンガンで十分アンモニア分解能
が発揮されるが、これにＣｕ及び／又はＦｅを含有させ
た酸化マンガンは更に性能が向上する。Ｃｕ及び／又は
Ｆｅは通常酸化物の状態で存在させる。Ｃｕ及び／又は
Ｆｅは金属換算でアンモニア分解剤中の含有率が０．５
〜１０重量％が好ましく、０．５以下では十分な効果が
認められず、１０以上では酸化マンガンの機能が損なわ
れ、アンモニア分解能が低下する。The above manganese oxide exhibits sufficient ammonia decomposing ability, but the performance of manganese oxide containing Cu and / or Fe is further improved. Cu and / or Fe are usually present in the state of oxides. The content of Cu and / or Fe in the ammonia decomposing agent is 0.5 in terms of metal.
It is preferably from 10 to 10% by weight, and when it is 0.5 or less, a sufficient effect is not recognized, and when it is 10 or more, the function of manganese oxide is impaired and the ammonia decomposing ability is lowered.
【０００６】これらの分解剤がアンモニアの分解におい
て高い活性を示すのはアンモニアが分解剤上で分解して
いるかもしくはアンモニアの一部が酸化されＮＯとなり
それが分解剤上においてアンモニアによる選択的還元反
応を生起していることによると考えられる。These decomposing agents show high activity in decomposing ammonia because ammonia is decomposed on the decomposing agent or a part of ammonia is oxidized to NO, which is a selective reduction reaction by ammonia on the decomposing agent. It is thought that this is due to the occurrence of.
【０００７】[0007]
【発明の実施の形態】これらの反応が有効に行なわれる
好ましい温度域は１００〜４５０℃の範囲であり、より
好ましくは１５０〜３００℃の範囲である。反応温度が
１００℃より低い場合には、この反応の活性は低く、
又、反応温度が４５０℃を超える場合には、担持したＮ
Ｈ３の酸化反応が優先的に進行し、ＮＯＸの生成が多量
にみられるので好ましくない。これらの触媒への熱の供
給は、通常行なわれているようなガスを加熱する方法も
もちろんであるが、触媒を導電性を有する構造体に担持
し、通電加熱してもよい。BEST MODE FOR CARRYING OUT THE INVENTION The preferred temperature range in which these reactions are effectively carried out is in the range of 100 to 450 ° C, more preferably in the range of 150 to 300 ° C. When the reaction temperature is lower than 100 ° C, the activity of this reaction is low,
When the reaction temperature exceeds 450 ° C, the supported N
The H 3 oxidation reaction preferentially proceeds and a large amount of NO X is generated, which is not preferable. The heat may be supplied to these catalysts by, of course, a method of heating a gas which is usually performed, but the catalyst may be supported on a conductive structure and electrically heated.
【０００８】本発明による分解剤は、従来知られている
成形方法によって、ハニカム状、球状等の種の形状に成
形することができる。この成形に際し、成形助剤、成形
補強体、無機繊維、有機バインダー等を適宜配合しても
よい。又、予め成形された基材上にウォッシュコート法
等によって被覆担持させることもできる。さらに従来知
られているその他の吸着剤の調整方法によることもでき
る。The decomposing agent according to the present invention can be molded into a seed shape such as a honeycomb shape or a spherical shape by a conventionally known molding method. At the time of this molding, a molding aid, a molding reinforcement, an inorganic fiber, an organic binder and the like may be appropriately mixed. It is also possible to carry the coating on a preformed base material by a wash coating method or the like. Furthermore, it is possible to use other conventionally known methods for adjusting the adsorbent.
【０００９】[0009]
【実 施例】以下具体的に実施例により説明する。 実施例１ 和光純薬製特級硝酸マンガン６水和物１２１．８ｇを５
０ｍｌのイオン交換水に溶解した硝酸マンガン水溶液
を、和光純薬製特級過マンガン酸カリウム４０．０ｇを
２００ｍｌのイオン交換水に溶解した過マンガン酸カリ
ウム水溶液に攪拌下で滴下し、約３０分にて反応を終え
た後、ろ過、イオン交換水にて水洗を行ない、６１ｇの
乾燥物を得た。この時の比表面積は２０４ｍ２／ｇであ
った。[Examples] Specific examples will be described below. Example 1 51.8 g of special grade manganese nitrate hexahydrate manufactured by Wako Pure Chemical Industries, Ltd.
An aqueous solution of manganese nitrate dissolved in 0 ml of ion-exchanged water was added dropwise to an aqueous solution of potassium permanganate (40.0 g of Wako Pure Chemical Industries, Ltd.) in 200 ml of ion-exchanged water while stirring, and the mixture was added to the solution in about 30 minutes. After completion of the reaction, filtration and washing with ion-exchanged water were performed to obtain 61 g of a dried product. The specific surface area at this time was 204 m 2 / g.
【００１０】実施例２ 和光純薬製特級硝酸マンガン６水和物１２１．８ｇと和
光純薬製特級硫酸第一鉄７水和物５９．０ｇを４００ｍ
ｌのイオン交換水に溶解した硝酸マンガン−硫酸第一鉄
混合水溶液を、和光純薬製特級過マンガン酸カリウム４
０．０ｇを２００ｍｌのイオン交換水に溶解した過マン
ガン酸カリウム水溶液に攪拌下で滴下し、約３０分にて
反応を終えた後、ろ過、イオン交換水にて水洗を行な
い、６３ｇの乾燥物を得た。この時の比表面積は２４９
ｍ２／ｇで、乾燥物中のＦｅの含有率は６．５％であっ
た。Example 2 121.8 g of Wako Pure Chemical Industries special grade manganese nitrate hexahydrate and 59.0 g of Wako Pure Chemical Industries special grade ferrous sulfate heptahydrate 400 m
A manganese nitrate-ferrous sulfate mixed aqueous solution dissolved in 1 l of ion-exchanged water was added to Wako Pure Chemical Industries, Ltd. special grade potassium permanganate 4
0.0 g of the solution was added dropwise to an aqueous solution of potassium permanganate dissolved in 200 ml of ion-exchanged water under stirring, and the reaction was completed in about 30 minutes, followed by filtration and washing with ion-exchanged water to obtain 63 g of a dried product. Got The specific surface area at this time is 249
The content of Fe in the dried product was 6.5% at m 2 / g.
【００１１】実施例３ 実施例２において、硫酸第一鉄７水和物の重量を１１．
８ｇとした以外は実施例１と同様にして、６５ｇの乾燥
物を得た。この時の比表面積は２４０ｍ２／ｇで、乾燥
物中のＦｅの含有率は１．２％であった。Example 3 In Example 2, the weight of ferrous sulfate heptahydrate was adjusted to 11.
65 g of a dried product was obtained in the same manner as in Example 1 except that the amount was 8 g. At this time, the specific surface area was 240 m 2 / g, and the Fe content in the dried product was 1.2%.
【００１２】実施例４ 実施例２において、硫酸第一鉄７水和物の重量を１７７
ｇとした以外は実施例１と同様にして、６３ｇの乾燥物
を得た。この時の比表面積は２３４ｍ２／ｇで、乾燥物
中のＦｅの含有率は１８．４％であった。Example 4 In Example 2, the weight of ferrous sulfate heptahydrate was adjusted to 177
63 g of a dried product was obtained in the same manner as in Example 1 except that the amount was changed to g. At this time, the specific surface area was 234 m 2 / g, and the Fe content in the dried product was 18.4%.
【００１３】実施例５ 実施例２において、硫酸第一鉄７水和物の代わりに和光
純薬製特級硝酸銅３水和物５１．３ｇを用いること以外
は実施例１と同様にして、６２ｇの乾燥物を得た。この
時の比表面積は２０８ｍ２／ｇで、乾燥物中のＣｕの含
有率は６．１％であった。Example 5 62 g in the same manner as in Example 1 except that 51.3 g of Wako Pure Chemical Industries, Ltd. special grade copper nitrate trihydrate was used in place of ferrous sulfate heptahydrate. A dried product of At this time, the specific surface area was 208 m 2 / g, and the Cu content in the dried product was 6.1%.
【００１４】実施例６ 和光純薬製特級炭酸マンガン１００ｇと和光純薬製特級
炭酸銅６．０ｇを混合した後、空気中３００℃で５時間
焼成した。得られた焼成物を０．１Ｎの硝酸水溶液１ｌ
に投入し３０分間攪拌して酸処理を行なった後、ろ過、
イオン交換水にて水洗を行ない、８２ｇの乾燥物を得
た。この時の比表面積は１８５ｍ２／ｇで、乾燥物中の
Ｃｕの含有率は５．８％であった。Example 6 100 g of Wako Pure Chemical Industries 'special grade manganese carbonate and 6.0 g of Wako Pure Chemical Industries' special grade copper carbonate were mixed and then fired in air at 300 ° C. for 5 hours. 1 L of a 0.1 N nitric acid aqueous solution was obtained.
And stirred for 30 minutes for acid treatment, and then filtered,
It was washed with ion-exchanged water to obtain 82 g of a dried product. At this time, the specific surface area was 185 m 2 / g, and the Cu content in the dried product was 5.8%.
【００１５】比 較 例 比表面積１１５ｍ２／ｇの活性二酸化チタン１００ｇに
適宜イオン交換水を加えてスラリーとし、Ｈ２ＰｔＣｌ
５溶液を金属Ｐｔ換算で１．０ｇとなるように添加し
た。このスラリーを１時間攪拌した後、ＮＨ４ＯＨ溶液
によりｐＨ９に調整し、攪拌しながら１０ｗｔ％のヒド
ラジン溶液１００ｍｌを加えてＰｔを還元した。このス
ラリーをろ過、水洗、乾燥し、４００℃で４時間焼成
後、粉砕してＰｔ−ＴｉＯ２（重量比１／１００）の粉
末を得た。Specific Comparative Example Ion-exchanged water was appropriately added to 100 g of activated titanium dioxide having a specific surface area of 115 m 2 / g to form a slurry, and H 2 PtCl
5 solutions were added so as to be 1.0 g in terms of metallic Pt. After stirring this slurry for 1 hour, the pH was adjusted to 9 with an NH 4 OH solution, and 100 ml of a 10 wt% hydrazine solution was added with stirring to reduce Pt. This slurry was filtered, washed with water, dried, calcined at 400 ° C. for 4 hours, and then pulverized to obtain a Pt—TiO 2 (weight ratio 1/100) powder.
【００１６】性能評価試験 実施例１〜６及び比較例によって得た触媒を用いて、下
記の試験条件でアンモニア分解反応を行ない、その除去
率を求めた。尚、アンモニア濃度は検知管を用いて測定
した。 ガス組成 ＮＨ３ ２５ｐｐｍ 空気バランス 空間速度 ２０，０００Ｈｒ−１ 温 度 １５０℃Performance Evaluation Test Using the catalysts obtained in Examples 1 to 6 and Comparative Example, an ammonia decomposition reaction was carried out under the following test conditions, and the removal rate was obtained. The ammonia concentration was measured using a detector tube. Gas composition NH 3 25 ppm air balance space velocity 20,000Hr -1 Temperature 0.99 ° C.
【００１７】触媒の調整 実施例１〜６及び比較例で得られた粉体５０ｇと日産化
学製シリカゾル（商品名スノーテックス−Ｎ）５０ｇと
イオン交換水を適宜加えて顆粒状に形成し、２０メッシ
ュアンダー３０メッシュオーバーとした。試験結果を表
１に示す。Preparation of Catalyst 50 g of the powder obtained in Examples 1 to 6 and Comparative Example, 50 g of silica sol (trade name Snowtex-N) manufactured by Nissan Chemical Co., Ltd. and ion-exchanged water were appropriately added to form a granule, and 20 Mesh under 30 mesh over. Table 1 shows the test results.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【発明の効果】上記の如く本発明によるアンモニア分解
剤は優れた効果を発揮する。As described above, the ammonia decomposing agent according to the present invention exhibits excellent effects.
Claims (2)
±１°である酸化マンガンを主成分とするアンモニア分
解剤。1. The diffraction angle (2θ) of the maximum X-ray intensity is 37.
Ammonia decomposer whose main component is manganese oxide, which is ± 1 °.
±１°であって、Ｃｕ及び／又はＦｅを含有する酸化マ
ンガンを主成分とするアンモニア分解剤。2. The diffraction angle (2θ) of the maximum X-ray intensity is 37.
An ammonia decomposing agent which is ± 1 ° and contains manganese oxide containing Cu and / or Fe as a main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25004295A JP3772364B2 (en) | 1995-08-22 | 1995-08-22 | Ammonia decomposition agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25004295A JP3772364B2 (en) | 1995-08-22 | 1995-08-22 | Ammonia decomposition agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0957097A true JPH0957097A (en) | 1997-03-04 |
| JP3772364B2 JP3772364B2 (en) | 2006-05-10 |
Family
ID=17201964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25004295A Expired - Fee Related JP3772364B2 (en) | 1995-08-22 | 1995-08-22 | Ammonia decomposition agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3772364B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116018205A (en) * | 2020-09-03 | 2023-04-25 | 株式会社Nbc纱网技术 | deodorizing catalyst |
-
1995
- 1995-08-22 JP JP25004295A patent/JP3772364B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116018205A (en) * | 2020-09-03 | 2023-04-25 | 株式会社Nbc纱网技术 | deodorizing catalyst |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3772364B2 (en) | 2006-05-10 |
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