JP2725793B2 - Method for producing plate catalyst for removing nitrogen oxides - Google Patents
Method for producing plate catalyst for removing nitrogen oxidesInfo
- Publication number
- JP2725793B2 JP2725793B2 JP63220084A JP22008488A JP2725793B2 JP 2725793 B2 JP2725793 B2 JP 2725793B2 JP 63220084 A JP63220084 A JP 63220084A JP 22008488 A JP22008488 A JP 22008488A JP 2725793 B2 JP2725793 B2 JP 2725793B2
- Authority
- JP
- Japan
- Prior art keywords
- catalyst
- substrate
- plate
- nitrogen oxides
- removing nitrogen
- 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
- 239000003054 catalyst Substances 0.000 title claims description 91
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000000758 substrate Substances 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 239000012298 atmosphere Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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除去用板状触媒の製造方法に係
り、特に排ガスの流動抵抗が少ない窒素酸化物除去用板
状触媒の製造方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for producing a plate catalyst for removing nitrogen oxides, and more particularly to a method for producing a plate catalyst for removing nitrogen oxides having a low flow resistance of exhaust gas. Things.
近時、公害防止の点から各種燃焼設備から発生する排
ガスを清浄にすることが望まれている。特に排ガス中の
窒素酸化物の除去のため、種々の方法、手段が採用され
ている。その一つとして排ガス中に還元剤（例えばアン
モニア）を混合したのち、この排ガスを触媒が充填して
ある脱硝装置に導き、触媒と接触させて排ガス中の窒素
酸化物を選択的に還元する方法が行なわれている。Recently, it has been desired to purify exhaust gas generated from various combustion facilities from the viewpoint of pollution prevention. In particular, various methods and means have been adopted for removing nitrogen oxides in exhaust gas. As one of the methods, after mixing a reducing agent (for example, ammonia) in the exhaust gas, the exhaust gas is led to a denitration device filled with a catalyst, and brought into contact with the catalyst to selectively reduce nitrogen oxides in the exhaust gas. Is being done.
上記した従来技術における脱硝装置としては、粒状触
媒の触媒層を所定厚さ設け、排ガスをこの触媒層を通過
させるものがあるが、排ガス中に煤じんや石炭灰等を多
量に含む場合等は、煤じんや石炭灰等が触媒層に堆積し
て圧力損失の増加、脱硝機能低下等の問題を生じてい
た。そのため排ガスの流れに対して平行な反応面を有す
るハニカム状触媒や板状触媒が考えられ現在主流となっ
ている。As the denitration device in the above-mentioned conventional technology, there is a device in which a catalyst layer of a granular catalyst is provided with a predetermined thickness and the exhaust gas passes through the catalyst layer, but when the exhaust gas contains a large amount of soot and coal ash, etc. Soot, coal ash and the like are deposited on the catalyst layer, causing problems such as an increase in pressure loss and a decrease in denitration function. Therefore, a honeycomb catalyst or a plate catalyst having a reaction surface parallel to the flow of the exhaust gas is considered, and is currently mainstream.
しかしながら、ハニカム状触媒は材料を金型を通して
押出し成型して作るため、大型のものを作る場合、その
製造技術上多くの問題があり、またハニカム状触媒その
ものも機械的な強度が弱く問題がある。また板状触媒は
強度を持たせるため強度部材として金属基板を使用しそ
の基板上に触媒成分を塗布して製造する方法が採用され
ているが、触媒成分と基板との付着力が弱いため、触媒
成分が剥離したり、脱落しやすいという問題がある。こ
れは単に付着力のみならず、塗布した触媒成分層と基板
とが排ガスの温度変化により膨張、収縮を繰り返して触
媒成分層に亀裂を発生し、触媒成分層の剥離、脱落を助
長するためである。また上記現象は触媒を実機に使用時
のみならず、触媒製造中においても発生し、製造工程
中、触媒成分を金属基板に塗布後必ず焼成を行なうが焼
成温度は実機使用時の温度より高い温度履歴を与える必
要があるため膨張、収縮は実機使用時よりも大きくな
り、このため焼成時、強度の低下、触媒成分層の金属基
板からの脱落という問題があった。However, since the honeycomb catalyst is made by extruding a material through a mold, there are many problems in manufacturing technology when manufacturing a large catalyst, and the honeycomb catalyst itself has a problem of low mechanical strength. . In addition, a plate-shaped catalyst is manufactured by using a metal substrate as a strength member to apply strength and applying a catalyst component on the substrate to manufacture the catalyst.However, since the adhesion between the catalyst component and the substrate is weak, There is a problem that the catalyst component is easily peeled or dropped. This is not only due to the adhesive force, but also because the applied catalyst component layer and the substrate repeatedly expand and contract due to a change in the temperature of the exhaust gas, thereby generating cracks in the catalyst component layer and promoting peeling and falling off of the catalyst component layer. is there. In addition, the above phenomenon occurs not only when the catalyst is used in the actual machine, but also during the production of the catalyst. During the manufacturing process, the catalyst is always fired after applying the catalyst component to the metal substrate, but the firing temperature is higher than the temperature when the actual machine is used. Since it is necessary to provide a history, expansion and shrinkage become larger than when the actual machine is used. Therefore, there has been a problem that during firing, the strength is reduced and the catalyst component layer is dropped off from the metal substrate.
本発明は上記した従来技術にかかる窒素酸化物除去用
板状触媒の製造方法の課題を除去することを目的とする
もので、金属基板に酸性触媒成分を塗布したのち、乾燥
工程を40℃以下の雰囲気で、風速３〜7m/sの空気を送風
して行なうことによって達成される。The present invention aims to eliminate the problems of the above-described conventional method for producing a plate oxide catalyst for removing nitrogen oxides.After applying an acidic catalyst component to a metal substrate, the drying step is performed at 40 ° C. or less. In an atmosphere of 3 to 7 m / s.
すなわち、本願の請求項記載の発明は、金属製薄板に
触媒成分を塗布してなる排ガス中の窒素酸化物除去用板
状触媒の製造方法において、金属薄板にアルミニウムを
溶射して基板を作る工程と、この基板に酸性触媒成分を
塗布する工程と、塗布後所定形状に成形する工程と、前
記基板に塗布した酸性触媒成分を該基板に対して熟成固
着させる工程と、その後所定温度で焼成する工程とから
ることを特徴とする窒素酸化物除去用板状触媒の製造方
法に関する。That is, the invention described in the claims of the present application is a method for producing a substrate by spraying aluminum onto a metal thin plate in a method for producing a plate-like catalyst for removing nitrogen oxides in exhaust gas obtained by applying a catalyst component to a metal thin plate. And a step of applying the acidic catalyst component to the substrate, a step of forming the acidic catalyst component into a predetermined shape after the application, a step of aging and fixing the acidic catalyst component applied to the substrate to the substrate, and then firing at a predetermined temperature. The present invention relates to a method for producing a plate catalyst for removing nitrogen oxides, comprising:
本願の請求項２記載の発明は、前記基板に塗布した酸
性触媒節分を該基板に対し熟成固着させる工程が、40℃
以下の雰囲気で３〜7m/sの空気を２時間以上送風する乾
燥工程であることを特徴とする特許請求の範囲第１項記
載の窒素酸化物除去用板状触媒の製造方法に関する。In the invention according to claim 2 of the present application, the step of aging and fixing the acidic catalyst segment applied to the substrate to the substrate is performed at 40 ° C.
2. The method for producing a plate catalyst for removing nitrogen oxides according to claim 1, wherein the drying step is a drying step in which air of 3 to 7 m / s is blown for 2 hours or more in the following atmosphere.
触媒活性成分を金属薄板に塗布したものを所定形状に
成形したのち、所定寸法に切断し、直ちに80〜120℃の
温風による強制乾燥を行ない、続いて400〜600℃にて焼
成を行ない触媒に活性を与えるという従来技術になる板
状触媒の製造方法では、焼成時に触媒成分が金属基板か
らはがれ落ちるという現象が発生した。After forming the catalyst active component on a thin metal plate into a predetermined shape, cut it into a predetermined size, immediately perform forced drying with warm air at 80 to 120 ° C, and then calcine at 400 to 600 ° C. In the conventional method for producing a plate-shaped catalyst, which gives activity to the catalyst, a phenomenon occurs in which the catalyst component is peeled off from the metal substrate during firing.
上記現象についての発明者らの検討の結果、触媒を所
定寸法に切断後ただちに温風で乾燥を行なうと、触媒成
分中の水分のみが放出されてしまうため、触媒原料中に
含有されていた酸性分（硫酸分）によって金属基板に溶
射された金属アルミニウム成分が腐食されることが少な
く、触媒成分とアルミニウム成分との腐食による結合が
十分行なわれることなく剥離が発生し易くなるものと考
えられる。As a result of studies by the inventors on the above phenomenon, if the catalyst is cut into a predetermined size and immediately dried with hot air, only the water in the catalyst component is released, and the acid contained in the catalyst raw material is released. It is considered that the metal component sprayed on the metal substrate is less corroded by the component (sulfuric acid component), and it is considered that the catalyst component and the aluminum component are not sufficiently bonded by the corrosion and peeling is likely to occur.
これに対し、室温で強制通風乾燥（例えば送風機など
による乾燥）を２時間以上行なう本発明の乾燥工程を適
用すると上記現象が解消される。これは室温強制乾燥さ
せると触媒成分中の水分のみの放出はなく、金属基板上
に溶射されたアルミニウム成分が硫酸水により腐食し、
基板と触媒成分の密着力が増して剥離し難くなることが
分った。On the other hand, when the drying step of the present invention in which forced ventilation drying (for example, drying with a blower or the like) is performed for 2 hours or more at room temperature is applied, the above phenomenon is solved. This is because when forced drying at room temperature, there is no release of only water in the catalyst component, the aluminum component sprayed on the metal substrate is corroded by sulfuric acid,
It was found that the adhesion between the substrate and the catalyst component was increased, and it was difficult to peel off.
厚さ0.3〜1.0mm程度の鉄、ステンレス鋼などの薄板上
に細い所定長さのスリット上切れ目を千鳥配置に入れ、
その後スリットの方向と直角方向に引張り力を加えて網
目状の開口を多数有するエキスパンドメタルを形成す
る。このエキスパンドメタル上に酸化雰囲気下で金属ア
ルミニウムを溶射・塗布して触媒基板とする。The slits on the slit of a predetermined length are placed in a zigzag pattern on a thin plate of iron, stainless steel, etc. with a thickness of about 0.3 to 1.0 mm.
Thereafter, a tensile force is applied in a direction perpendicular to the direction of the slit to form an expanded metal having a large number of mesh openings. Aluminum metal is sprayed and applied on the expanded metal in an oxidizing atmosphere to form a catalyst substrate.
この基板上に窒素酸化物除去用触媒活性成分を塗布す
るが、触媒活性成分としては酸化物および硫酸塩の形の
チタン、鉄、バナジウム、酸化物の形のモリブデン、タ
ングステンのいずれかが使用される。この際触媒活性成
分中には酸性成分（硫酸成分）が含有されていることが
必須条件となる。すなわち、触媒中にはチタン、鉄、バ
ナジウムのうちの１種以上が含有される。この硫酸成分
は焼成後の触媒の機械的強度を増すとともに後述するよ
うに触媒活性成分の金属基板上への付着力を強化し、焼
成時および使用時に基板からの触媒成分の剥離脱落を防
止するのに顕著に貢献する。A catalytically active component for removing nitrogen oxides is applied on this substrate, and as the catalytically active component, any of titanium, iron, vanadium in the form of oxide and sulfate, molybdenum in the form of oxide, and tungsten is used. You. At this time, it is an essential condition that the catalytically active component contains an acidic component (sulfuric acid component). That is, the catalyst contains one or more of titanium, iron, and vanadium. This sulfuric acid component increases the mechanical strength of the fired catalyst and also enhances the adhesion of the catalytically active component to the metal substrate as described later, preventing the catalyst component from peeling off from the substrate during firing and during use. Contributes significantly to
触媒成分を塗布された基板は、その表面をポリエチレ
ンの薄いフィルムで覆い、所定ピッチ間隔で山形の凹凸
を形成した型を有する成型機でプレスし触媒成形体を製
造する。この成形体を所定長さに切断し板状触媒とす
る。なお、これまでの記載のうち、触媒成分を除く各工
程の説明は本出願人が既に行なった特願昭56−33174
号、特願昭56−33175号、特願昭62−117962号に詳細に
記載されている。第１図に示すごとく上記板状触媒１を
成形の山が井桁状になるように積層し、矢印２、矢印３
の方向から送風する。この積層方法では矢印２、矢印３
またはその中間、どの方向から送風しても積層方向であ
れば同様の良好な結果を得た。この状態で２時間以上連
続送風することにより基板と触媒成分は熟成固着（硫酸
水による腐食固着）され、以後焼成（400〜650℃）する
と初期の目的を達成した強固な板状触媒を得る。なお積
層枚数は限定されないが、形状から約30枚程度が扱い易
い。送風時間と性能、強度との関係を第２図、第３図に
示す。送風時間は２時間以上で所期の目的を達成する
が、好ましくは12時間以上送風する方が付着強度が安定
している。これは、均一に風を当てることが不可能であ
り、必ず良く当る個所とよく当らない個所が生ずる訳で
あるが時間を置くことにより熟成固着が完全になるもの
と思われる。また、工程の都合で数日間、保管すること
もあるが、送風は24時間を超えることは試験結果から意
味が無いことを確認している。The surface of the substrate coated with the catalyst component is covered with a thin film of polyethylene, and pressed by a molding machine having a mold in which mountain-shaped irregularities are formed at predetermined pitch intervals to produce a catalyst molded body. This molded body is cut into a predetermined length to obtain a plate-like catalyst. In the above description, each step except for the catalyst component is described in Japanese Patent Application No. 56-33174, which has already been made by the present applicant.
And Japanese Patent Application Nos. 56-33175 and 62-117962. As shown in FIG. 1, the above-mentioned plate-like catalysts 1 are laminated so that the peaks of the molding are in a cross-girder shape.
Blow from the direction. In this stacking method, arrows 2 and 3
Or, even if air is blown from any direction, the same good result is obtained as long as it is in the laminating direction. By continuously blowing air for 2 hours or more in this state, the substrate and the catalyst component are aged and fixed (corrosion-fixed by sulfuric acid solution), and thereafter calcined (400 to 650 ° C.) to obtain a strong plate-like catalyst which has achieved the initial purpose. The number of layers is not limited, but about 30 sheets are easy to handle due to the shape. FIGS. 2 and 3 show the relationship between the blowing time and the performance and strength. Although the intended purpose is achieved with a blowing time of 2 hours or more, it is preferable to blow the air for 12 hours or more to stabilize the adhesive strength. This is because it is impossible to uniformly apply the wind, and there are some places where good contact is made and some places where good contact is not made. However, it is considered that the aging and fixation become complete with time. In addition, although it may be stored for several days due to the process, it has been confirmed from the test results that blowing air for more than 24 hours is meaningless.
なお、触媒乾燥温度についての実験結果を第５図に示
ずが、０〜40℃が好適である。乾燥温度が高いと急激に
乾燥し、触媒表面にクラックが入り、基板から触媒成分
の落下剥離が生じる。In addition, although the experimental result about a catalyst drying temperature is not shown in FIG. 5, 0-40 degreeC is suitable. If the drying temperature is high, the catalyst is dried rapidly, cracks are formed on the catalyst surface, and the catalyst components fall off and separate from the substrate.
乾燥用空気の風速については、3m/s以上の風速が必要
である。ただし、7m/sをこえると風力により触媒エレメ
ントが吹きとばされため風乾条件としては３〜7m/sが好
適であり、より好ましくは３〜5m/sである（第４図参
照）。Regarding the wind speed of the drying air, a wind speed of 3 m / s or more is required. However, when the speed exceeds 7 m / s, the catalyst element is blown off by wind force, so that the air drying condition is preferably 3 to 7 m / s, more preferably 3 to 5 m / s (see FIG. 4).
なお、上記条件を決定したのは、次の理由による。触
媒中の水分が15％以下になると基板上のアルミニウムの
腐食が生じにくくなり触媒成分と基板のアルミニウムを
介しての結合が弱い。また、基板上のアルミニウムの腐
食が進みすぎると触媒成分の活性が低下し脱硝率が落ち
ることが分かっており、触媒とアルミニウムの腐食結合
は短時間で行なう必要がある。The above conditions were determined for the following reasons. When the water content in the catalyst is 15% or less, corrosion of aluminum on the substrate is less likely to occur, and the bonding between the catalyst component and the substrate via aluminum is weak. Further, it has been found that if the corrosion of aluminum on the substrate progresses too much, the activity of the catalyst component decreases and the denitration rate decreases, and it is necessary to perform the corrosion bonding between the catalyst and aluminum in a short time.
乾燥用空気の流速が1m/s以下では触媒の水分が15％以
下にするのに20hr以上必要であり、この間にアルミニウ
ムの腐食が進行しすぎて、脱硝率が低下する。When the flow rate of the drying air is 1 m / s or less, it takes 20 hours or more to reduce the water content of the catalyst to 15% or less. During this time, the corrosion of aluminum proceeds excessively, and the denitration rate decreases.
なお、この強制流動空気乾燥後、工程の都合により保
管が必要な場合は20〜30枚づつぴったり重ね合わせる法
が良いことがわかった。この状態で一週間程度の保管で
は性能劣化などの不具合は認められなかった。なお摩耗
強度は触媒を縦横約100mmに切断した試験片に500mmの高
さより平均粒径0.7mmのグリッド粒を8kg落下させて触媒
面を摩耗させ、前後の試験片の重量を測定することによ
り判定する方法を採用している。また、落下強度は板状
触媒を100mm×250mmに切断して試験片とし、1mの高さか
らこの試験片を10回自由落下させて、前後の試験片の重
量を測定して試験前後における重量差の大小で強度を判
定する方法を採用している。It should be noted that, after the forced flowing air drying, if storage is necessary due to the process, it is found that a method of exactly overlapping 20 to 30 sheets is preferable. In this state, no problem such as performance degradation was observed after storage for about one week. The abrasion strength was determined by dropping 8 kg of grid particles with an average particle size of 0.7 mm from a height of 500 mm onto a test piece obtained by cutting the catalyst to about 100 mm in length and width, abrading the catalyst surface, and measuring the weight of the front and rear test pieces. Adopt a way to. The drop strength was determined by cutting a plate-shaped catalyst into 100 mm x 250 mm into test pieces, dropping the test pieces 10 times from a height of 1 m, measuring the weight of the front and rear test pieces, and measuring the weight before and after the test. A method of determining the strength based on the magnitude of the difference is employed.
第６図にスペーサ部分をずらせて平行に板状触媒を積
み重ねたものを示す。この方法で積層した場合送風方向
は矢印３の方向もしくはこの反対側の方向に限定される
が、前記実施例と同様３時間以上強制乾燥させることに
より基板と触媒成分の固着力を得、この後、焼成を行な
い強度の強い板状触媒を得る。第７図および第８図に触
媒焼成時の温度経過を示す。いずれかの方法により焼成
する。FIG. 6 shows a plate-like catalyst stacked in parallel with the spacer portions shifted. In the case of laminating by this method, the blowing direction is limited to the direction of arrow 3 or the direction opposite thereto, but by forcibly drying for 3 hours or more as in the above-described embodiment, a fixing force between the substrate and the catalyst component is obtained. And calcining to obtain a plate-like catalyst having high strength. FIG. 7 and FIG. 8 show the temperature progress at the time of calcination of the catalyst. It is fired by any method.
本発明を適用することにより、焼成時および使用時
に、触媒成分が金属基板から剥離脱落するのを著しく低
減することができ、脱硝率が高く長寿命の脱硝触媒を得
ることができる。By applying the present invention, it is possible to significantly reduce the catalyst component from peeling and falling off from the metal substrate during firing and during use, and to obtain a long-life denitration catalyst having a high denitration rate.
第１図は本発明の触媒製造方法における触媒乾燥要領
図、第２図は送風乾燥時間と脱硝率の関係図、第３図は
送風乾燥時間と触媒の剥離量および摩耗量の関係図、第
４図乾燥空気の流速と触媒の水分低下量の関係図、第５
図は乾燥温度と触媒の剥離量および脱硝率の関係図、第
６図は触媒乾燥の他の要領図である。第７図〜第８図は
触媒焼成時の温度経過図である。 １……板状触媒。FIG. 1 is a diagram of the catalyst drying procedure in the catalyst production method of the present invention, FIG. 2 is a diagram showing the relationship between the blast drying time and the denitration rate, FIG. FIG. 4 is a diagram showing the relationship between the flow rate of dry air and the amount of water reduction of the catalyst, FIG.
FIG. 6 is a diagram showing the relationship between the drying temperature, the amount of peeling of the catalyst and the denitration rate, and FIG. 6 is another diagram showing the catalyst drying. FIG. 7 to FIG. 8 are diagrams showing the temperature progress at the time of calcination of the catalyst. 1 ... plate catalyst.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｊ 23/84 Ｂ０１Ｄ 53/36 １０２Ｄ (72)発明者 中元 幸成 広島県豊田郡安芸津町風早3300番地 バ ブコック日立株式会社安芸津分工場内 (56)参考文献 特開 昭55−132638（ＪＰ，Ａ)──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location B01J 23/84 B01D 53/36 102D (72) Inventor Yukinari Nakamoto 3300, Kazehaya, Akizu-cho, Toyota-gun, Hiroshima Prefecture Address Babcock Hitachi, Ltd. Akitsu Branch Plant (56) References JP-A-55-132638 (JP, A)
Claims (2)
ス中の窒素酸化物除去用板状触媒の製造方法において、
金属薄板にアルミニウムを溶射して基板を作る工程と、
この基板に酸性触媒成分を塗布する工程と、塗布後所定
形状に成形する工程と、前記基板に塗布した酸性触媒成
分を該基板に対して熟成固着させる工程と、その後所定
温度で焼成する工程とからることを特徴とする窒素酸化
物除去用板状触媒の製造方法。1. A process for producing a plate-like catalyst for removing nitrogen oxides in exhaust gas, comprising applying a catalyst component to a metal thin plate,
A process of making a substrate by spraying aluminum on a thin metal plate,
A step of applying an acidic catalyst component to the substrate, a step of shaping the substrate into a predetermined shape after the application, a step of aging and fixing the acidic catalyst component applied to the substrate to the substrate, and a step of firing at a predetermined temperature thereafter. A method for producing a plate catalyst for removing nitrogen oxides, comprising:
に対し熟成固着させる工程が、40℃以下の雰囲気で３〜
7m/sの空気を２時間以上送風する乾燥工程であることを
特徴とする特許請求の範囲第１項記載の窒素酸化物除去
用板状触媒の製造方法。2. The step of aging and fixing the acidic catalyst component applied to the substrate to the substrate in an atmosphere at a temperature of 40 ° C. or less.
2. The method for producing a plate catalyst for removing nitrogen oxides according to claim 1, wherein the drying step comprises blowing air at 7 m / s for 2 hours or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63220084A JP2725793B2 (en) | 1988-09-02 | 1988-09-02 | Method for producing plate catalyst for removing nitrogen oxides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63220084A JP2725793B2 (en) | 1988-09-02 | 1988-09-02 | Method for producing plate catalyst for removing nitrogen oxides |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0268145A JPH0268145A (en) | 1990-03-07 |
| JP2725793B2 true JP2725793B2 (en) | 1998-03-11 |
Family
ID=16745680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63220084A Expired - Fee Related JP2725793B2 (en) | 1988-09-02 | 1988-09-02 | Method for producing plate catalyst for removing nitrogen oxides |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2725793B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05293388A (en) * | 1992-04-17 | 1993-11-09 | Babcock Hitachi Kk | Production of metal honeycomb catalyst carrier for purification of exhaust gas |
| US5792432A (en) * | 1994-11-15 | 1998-08-11 | Babcock-Hitachi Kabushiki Kaisha | Catalyst unit and gas purifying apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55132638A (en) * | 1979-04-04 | 1980-10-15 | Babcock Hitachi Kk | Laminar catalyst |
-
1988
- 1988-09-02 JP JP63220084A patent/JP2725793B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0268145A (en) | 1990-03-07 |
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