WO2012086413A1 - 脱硝触媒用担体 - Google Patents
脱硝触媒用担体 Download PDFInfo
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- WO2012086413A1 WO2012086413A1 PCT/JP2011/078265 JP2011078265W WO2012086413A1 WO 2012086413 A1 WO2012086413 A1 WO 2012086413A1 JP 2011078265 W JP2011078265 W JP 2011078265W WO 2012086413 A1 WO2012086413 A1 WO 2012086413A1
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- carrier
- catalyst
- tio
- denitration
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- 239000003054 catalyst Substances 0.000 title claims abstract description 57
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 25
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- 238000000034 method Methods 0.000 claims description 9
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- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
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- 238000000975 co-precipitation Methods 0.000 claims description 2
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- 231100000572 poisoning Toxicity 0.000 abstract description 9
- 230000000607 poisoning effect Effects 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 6
- 229910052785 arsenic Inorganic materials 0.000 abstract description 5
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract description 3
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- 125000004432 carbon atom Chemical group C* 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
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- XAYGUHUYDMLJJV-UHFFFAOYSA-Z decaazanium;dioxido(dioxo)tungsten;hydron;trioxotungsten Chemical compound [H+].[H+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[NH4+].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O.[O-][W]([O-])(=O)=O XAYGUHUYDMLJJV-UHFFFAOYSA-Z 0.000 description 4
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
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- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
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- ZUEKXCXHTXJYAR-UHFFFAOYSA-N tetrapropan-2-yl silicate Chemical compound CC(C)O[Si](OC(C)C)(OC(C)C)OC(C)C ZUEKXCXHTXJYAR-UHFFFAOYSA-N 0.000 description 1
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- B01D2258/0283—Flue gases
Definitions
- the present invention relates to a denitration catalyst carrier used in various denitration apparatuses, and more particularly to a denitration catalyst carrier suitable for a denitration apparatus for coal-fired boiler exhaust gas.
- a catalyst in which V 2 O 5 , WO 3 and MoO 3 are supported as active components on a TiO 2 catalyst carrier is used.
- the ammonia addition selective catalytic reduction method used is applied.
- NH 3 is added as a reducing agent to cause a denitration reaction (4NO + 4NH 3 + O 2 ⁇ 4N 2 + 6H 2 O).
- V, W, Mo, etc. supported on the solid acid sites of TiO 2 Work as an active point.
- an object of the present invention is to provide a denitration catalyst support capable of obtaining a denitration catalyst with further improved tolerance for poisonous substances such as arsenic.
- the denitration catalyst carrier according to the present invention contains TiO 2 , has a honeycomb structure, and has a specific surface area of more than 100 m 2 / g.
- a denitration catalyst having a further improved tolerance for poisonous substances such as arsenic can be obtained.
- the denitration catalyst carrier of the present invention contains TiO 2 , has a honeycomb structure, and further has a specific surface area of more than 100 m 2 / g measured for a denitration catalyst carrier shaped to have a honeycomb structure. .
- the specific surface area is preferably as large as possible, and particularly preferably 100 to 160 m 2 / g.
- the specific surface area is a value obtained by measurement by a nitrogen gas adsorption method.
- the denitration catalyst carrier of the present invention has a honeycomb structure, and among them, a honeycomb structure having a plurality of through holes as a reaction channel is preferable.
- a denitration catalyst carrier include, but are not limited to, a carrier as shown in FIG.
- the honeycomb structure is not limited to a rectangular cross section, and may have a cross section such as a circle, an ellipse, a triangle, a pentagon, and a hexagon.
- the carrier of the present invention is a complex oxide containing, in addition to Ti, one or more elements selected from the group consisting of Si, B, P, Zr and W (hereinafter referred to as element M). It is preferable. Any of the above elements M to be complexed with Ti is an element that is not easily poisoned by As in the exhaust gas, and is therefore suitable as a denitration catalyst. In the case of a composite oxide containing two or more elements M in addition to Ti, it is preferable to add other elements based on Ti and Si. Even when two or more elements M are contained, a carrier having the same or further improved As poisoning resistance can be obtained when one element is combined according to the specific surface area.
- the weight ratio of TiO 2 in the support to the oxide of element M (hereinafter referred to as M oxide) is preferably in the range of 50:50 to 99: 1. If the ratio of M oxide is less than this range, the composite effect may be lost, and if it exceeds this range, Ti and M are adjacent to each other through oxygen (—Ti—OM—) bond. However, the effect of forming an acidic point, which is a point indicating acidity, is not promoted due to the bias of the charge on the solid surface, and a catalyst having satisfactory denitration performance may not be obtained because the ratio of TiO 2 is low.
- the carrier of the present invention can be manufactured by the following process. First, an alkoxide compound, chloride, sulfate or acetate of an element serving as a carrier element source is mixed, further mixed with water, and stirred in an aqueous solution or sol state for hydrolysis. By compounding with a highly reactive alkoxide or the like as a raw material, it is possible to form a more dispersed metal state in the solution and obtain a uniform complex oxide, increasing the amount of solid acid in the complex oxide Can be made.
- Ti alkoxide is a compound represented by the general formula Ti (OR 1 ) 4 (R 1 is an alkyl group having 1 to 20 carbon atoms, preferably 2 to 5 carbon atoms).
- R 1 is an alkyl group having 1 to 20 carbon atoms, preferably 2 to 5 carbon atoms.
- Ti sulfates such as TiOSO 4 and Ti (SO 4 ) 2 and Ti acetates such as Ti (OCOCH 3 ) 4 , TiO (OCOCH 3 ) 2 and Ti 2 (OCOCH 3 ) 6 can also be used.
- Si alkoxide is represented by the general formula Si (OR 2 ) 4 (R is an alkyl group having 1 to 20 carbon atoms, preferably 1 to 5 carbon atoms). For example, Si (OCH 3 ) 4 , Si (OC 2 H 5 ) 4 , Si (O-isoC 3 H 7 ) 4 , Si (O-tertC 4 H 9 ) 4 and the like.
- Examples of the P alkoxide include P (OCH 3 ) 3 and PO (OCH 3 ) 3 .
- Examples of the B alkoxide include B (OCH 3 ) 3 and B (OC 2 H 5 ) 3 .
- Examples of the Zr alkoxide include Zr (OCH 3 ) 4 , Zr (OC 2 H 5 ) 4 , Zr (O—nC 3 H 7 ) 4 , Zr (O—isoC 3 H 7 ) 4 , Zr (O—nC). 4 H 9 ) 4 or the like.
- the W alkoxide is represented by the general formula W (OR) 6 (R is an alkyl group having 1 to 20 carbon atoms, preferably 1 to 5 carbon atoms). For example, W (OCH 3 ) 4 , W (OC 2 H 5 ) 4 , W (O-isoC 3 H 7 ) 4 , W (O-tertC 4 H 9 ) 4 and the like.
- the amount of water involved in the hydrolysis reaction is four times the number of moles of alkoxide, etc., but the amount of water present in the reaction mixture should
- the molar ratio is preferably 10 or more, particularly preferably 40 or more.
- the upper limit of the amount of water is not particularly limited, but even if it is increased more than necessary, the effect is not particularly increased, and the apparatus becomes larger, so usually a molar ratio of about 300 is sufficient.
- the hydrolysis is desirably performed at 50 ° C. or higher.
- a higher temperature at the time of hydrolysis is preferable because the crystals to be produced are refined and the specific surface area is increased.
- a more preferred range is 80 to 100 ° C.
- the mixture is neutralized as desired to obtain a precipitate, and then aged by further stirring for 5 minutes or longer, preferably 2 hours or longer.
- the aging is preferably performed at a temperature similar to that of hydrolysis. That is, the aging temperature is preferably 50 ° C. or higher, more preferably 80 to 100 ° C. Aging newly increases the bond and specific surface area of different kinds of carrier elements via oxygen atoms.
- the sol obtained by hydrolysis and then aging is filtered to obtain a gelled product, and this gelled product is washed and fired to obtain a TiO 2 carrier or a carrier composed of a composite oxide of TiO 2 and M oxide. it can.
- This composite oxide has an amorphous and / or anatase TiO 2 type crystal structure.
- the firing temperature varies depending on the composition ratio of the composite oxide, but is preferably in the range of 300 to 1000 ° C., more preferably 400 to 550 ° C. If it is less than 300 ° C., firing may be insufficient, and if it exceeds 1000 ° C., the specific surface area may decrease and As poisoning resistance may decrease, which is not preferable.
- the firing time varies depending on the composition ratio of the composite oxide, the firing temperature, etc., but is preferably in the range of 5 minutes to 24 hours, more preferably 4 to 5 hours. If the baking time is less than the above range, baking may be insufficient, and if it exceeds the above range, the specific surface area may be reduced and As poisoning resistance may be reduced.
- the carrier of the present invention may be produced by a conventionally known coprecipitation method other than the sol-gel method described above.
- NOx-containing gas such as NO and NO 2 can be contained in the presence of oxygen.
- a denitration catalyst having high durability against catalyst poisoning substances such as As in exhaust gas can be obtained by efficiently denitrating with ammonia.
- These catalysts can be used in the form of powder, granules, pellets, honeycombs or the like. It is also possible to obtain a denitration catalyst by forming an appropriate carrier into an appropriate shape as described above and supporting the active metal oxide on the formed carrier.
- the active metal content in the catalyst is 0.1 to 30% by weight.
- the preferred range is 0.2 to 5% by weight when the active metal is V, 0.1 to 20% by weight for Mo, and 5 to 20% by weight for W. .
- the denitration catalyst thus obtained can be used for combustion exhaust gas such as boiler exhaust gas.
- the denitration catalyst of the present invention is used for combustion exhaust gas having a concentration of catalyst poisoning substances such as As in the exhaust gas of 1 ppm or less, preferably 100 ppb or less, for example, at a usage time of about 10,000 hours or more, depending on the usage time. it can. If the use time is shorter than this, it can be used for combustion exhaust gas of about 100 ppm.
- the kneaded product was extruded and dried, followed by firing at 500 ° C. for 5 hours to obtain a comparative honeycomb molded carrier having a lattice spacing (S) of 7.5 mm and a wall thickness (T) of 1.0 mm (see FIG. 1). ).
- Ti source is a Ti (O-iC 3 H 7 ) is 4 and the Si source Si (OCH 3) 3, P (OCH 3) a P source 3, B source and a B (OCH 3) 3, Zr source and Zr (OCH 3) 4, and / or, ammonium paratungstate is W source ⁇ (NH 4) 10 W 12 O 41 ⁇ 5H 2 O ⁇ is translated into compounding ratios of oxides of the elements Then, a predetermined amount was mixed so as to have a blending ratio shown in Table 3, added to 80 ° C. water for hydrolysis, and further aged by stirring in water at the same temperature for 2 hours.
- the produced sol was filtered, and the produced alcohol was sufficiently washed and dried, then heated at 500 ° C. for 5 hours and calcined to obtain binary or ternary composite oxides 1 to 9.
- ammonium metavanadate (NH 4 VO 3) with ammonium paratungstate is ⁇ (NH 4) 10 W 12 O 41 ⁇ 5H 2 O ⁇ a V 2 O 5 5 Part by weight
- WO 3 was dissolved in a 10 wt% methylamine aqueous solution so as to be 8 parts by weight, impregnated in a composite oxide powder, dried, and calcined at 500 ° C. for 5 hours to obtain a catalyst powder.
- the above-mentioned integral honeycomb molded carrier was immersed in the slurry for the wash coat, taken out, and then blown off excess slurry and dried at 200 ° C.
- the coating amount was 50 g per 1 liter (apparent volume) of the substrate
- the coated materials were comparative honeycomb catalyst and honeycomb catalysts 1 to 9.
- Comparative Example 1 and Examples are the results of evaluation tests on the degree of deterioration of the comparative honeycomb catalyst having various specific surface areas and the comparative honeycomb catalyst obtained from the integrated honeycomb molded carriers 1 to 9 and the honeycomb catalysts 1 to 9. The results are shown in Table 3 as 1-9.
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Abstract
Description
すなわち、本発明にかかる脱硝触媒用担体は、TiO2を含み、ハニカム構造を有し、比表面積が100m2/gを超えるものである。
本発明の脱硝触媒用担体は、TiO2を含み、ハニカム構造を有し、更に、ハニカム構造を有するように成形された脱硝触媒用担体について測定した比表面積が100m2/gを超えるものである。比表面積を大きくすることにより、As吸着許容量の増大が図られ、As被毒耐性が向上し、脱硝触媒の後流側へのAsの流入を抑制することができる。比表面積は大きい程好ましく、特に100~160m2/gが好ましい。
比表面積は、窒素ガス吸着法により測定し得られた値である。
本明細書において「TiO2を含」むとは、TiO2を単独で含有する場合と、Tiが他の元素とともに複合酸化物を形成している場合と、TiO2を混合物として含有する場合のいずれをも含む概念である。
本発明の脱硝触媒用担体はハニカム構造を有しており、中でも、反応流路として複数の貫通孔を有するハニカム構造体であることが好ましい。このような脱硝触媒用担体として、例えば図1に示されるような担体が挙げられるが、これに限定されるものではない。ハニカム構造は、断面が矩形のものに限定されず、例えば、円状、楕円状、三角形、五角形、六角形等の断面を有していてもよい。
Tiのほかに2種以上の元素Mを含む複合酸化物とする場合、TiとSiとをベースとしてその他の元素を加えることが好ましい。2種以上の元素Mを含有する場合も、その比表面積に応じて1種の元素を組み合わせたときと同等かさらにAs被毒耐性を向上させた担体を得ることができる。
Siアルコキシドは、一般式Si(OR2)4(Rは炭素数1~20、好ましくは1~5のアルキル基)で表され、例えば、Si(OCH3)4、Si(OC2H5)4、Si(O-isoC3H7)4、Si(O-tertC4H9)4等があげられる。
Pアルコキシドとしては、例えば、P(OCH3)3、PO(OCH3)3等が挙げられる。
Bアルコキシドとしては、例えば、B(OCH3)3、B(OC2H5)3等が挙げられる。
Zrアルコキシドとしては、例えば、Zr(OCH3)4、Zr(OC2H5)4、Zr(O-nC3H7)4、Zr(O-isoC3H7)4、Zr(O-nC4H9)4等が挙げられる。
Wアルコキシドは、一般式W(OR)6(Rは炭素数1~20、好ましくは1~5のアルキル基)で表され、例えば、W(OCH3)4、W(OC2H5)4、W(O-isoC3H7)4、W(O-tertC4H9)4等があげられる。
混合液を所望により中和し沈殿物を得た後、さらに5分以上、望ましくは2時間以上攪拌して熟成させる。熟成は加水分解と同程度の温度で行うことが望ましい。すなわち、熟成温度は50℃以上が好ましく、80~100℃がより好ましい。熟成により、新たに酸素原子を介した異種の担体元素同士の結合及び比表面積が増加する。
本発明の担体は、上述したゾルゲル法以外に、従来公知の共沈法により製造されたものであってもよい。
(比較用担体1の調製)
337.6gのTi源であるTi(O-iC3H7)4に80℃の水4.4リットルを添加して加水分解し、さらに2時間、同温度の水中で攪拌して熟成させた。生成したゾルをろ過し、生成したアルコールを充分に洗浄し乾燥させた後、500℃で5時間加熱して焼成した。
100重量部のTiO2に対して、メタバナジン酸アンモニウム(NH4VO3)とパラタングステン酸アンモニウム{(NH4)10W12O41・5H2O}をV2O5は5重量部、WO3は8重量部となるように10wt%メチルアミン水溶液に溶解し、TiO2粉末に含浸させて乾燥後、500℃で5時間焼成し触媒粉末を得た。
この触媒粉末100重量部に対して、バインダとしてグラスファイバを3重量部、カオリンを3重量部、さらに有機可塑剤として酢酸セルロースを3重量部とアンモニア水溶液を添加して混練した。この混練物を押出成型し、乾燥後500℃で5時間焼成することにより、格子間隔(S)7.5mm、壁厚(T)1.0mmの比較用ハニカム成型担体を得た(図1参照)。
(一体型ハニカム成型担体1~9の調製)
Ti源であるTi(O-iC3H7)4とSi源であるSi(OCH3)3、P源であるP(OCH3)3、B源であるB(OCH3)3、Zr源であるZr(OCH3)4、および/または、W源であるパラタングステン酸アンモニウム{(NH4)10W12O41・5H2O}とを、各元素の酸化物の配合比に換算して表3に示す配合比となるように所定量混合し80℃の水に添加して加水分解し、さらに2時間、同温度の水中で攪拌して熟成させた。生成したゾルをろ過し、生成したアルコールを充分に洗浄し乾燥させた後、500℃で5時間加熱して焼成し二成分系または三成分系の各複合酸化物1~9を得た。
100重量部の複合酸化物1~9に対して、メタバナジン酸アンモニウム(NH4VO3)とパラタングステン酸アンモニウム{(NH4)10W12O41・5H2O}をV2O5は5重量部、WO3は8重量部となるように10wt%メチルアミン水溶液に溶解し、複合酸化物粉末に含浸させて乾燥後、500℃で5時間焼成し触媒粉末を得た。
この触媒粉末100重量部に対して、バインダとしてグラスファイバを3重量部、カオリンを3重量部、さらに有機可塑剤として酢酸セルロースを3重量部とアンモニア水溶液を添加して混練した。この混練物を押出成型し、乾燥後500℃で5時間焼成することにより、格子間隔(S)7.5mm、壁厚(T)1.0mmの一体型ハニカム成型担体1~9を得た(図1参照)。
メタバナジン酸アンモニウム(NH4VO3)3.9gとパラタングステン酸アンモニウム{(NH4)10W12O41・5H2O}9.0gを10wt%メチルアミン水溶液55ミリリットルに溶解し、前述のTiO2,または、複合酸化物1~9の粉末それぞれ89.0gに含浸させて乾燥後、500℃で5時間焼成し、前記担体に3wt%のV2O5及び8wt%のWO3を担持させた触媒粉を得た。得られたV2O5及びWO3を含有する触媒20重量部に対して水80重量部を加え、ボールミルで充分攪拌し、ウォッシュコート用スラリとした。該ウォッシュコート用スラリに前述の一体型ハニカム成型担体を浸漬し、取り出した後、余分なスラリを吹きはらい200℃で乾燥させた、コート量は基材1リットル(見かけ容量)あたり50gとし、このコート物を比較用ハニカム触媒およびハニカム触媒1~9とした。
劣化度は、Asを200ppm含むサンプルガスを比較用ハニカム触媒およびハニカム触媒1~9に1時間導通した前後での脱硝率の低減率を示したものであり、下記式(1)および(2)で評価した。
劣化度=(As導通後脱硝率)/(初期脱硝率) 式(1)
(脱硝率)=[(入口NOx-出口NOx)/入口NO]×100 式(2)
また、TiO2をベースとする三成分系(実施例5~9)においても比表面積の増大が図られることで二成分系(実施例1~4)と同様にAs負荷後の劣化を抑制できることがわかった。
さらに図2に示すように、複合酸化物が、二成分系であるか三成分系であるかもしくは複合元素の種類によらず、比表面積と劣化度との間に相関が見られることがわかった。
T 壁厚
Claims (4)
- TiO2を含み、ハニカム構造を有し、比表面積が100m2/gを超える脱硝触媒用担体。
- さらにSi,B,P,Zr及びWからなる群より選択される1種または2種以上の元素の酸化物を含有する複合酸化物であることを特徴とする請求項1に記載の脱硝触媒用担体。
- さらにSi,B,P,Zr及びWからなる群より選択される2種以上の元素の酸化物を含有する複合酸化物であることを特徴とする請求項1に記載の脱硝触媒用担体。
- 共沈法またはゾルゲル法により製造されたものであることを特徴とする請求項1ないし3のいずれかに記載の脱硝触媒用担体。
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CN2011800612144A CN103260754A (zh) | 2010-12-20 | 2011-12-07 | NOx还原催化剂用载体 |
CA2822023A CA2822023C (en) | 2010-12-20 | 2011-12-07 | Carrier for nox reduction catalyst |
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TWI422424B (zh) * | 2007-01-30 | 2014-01-11 | Babcock Hitachi Kk | Catalyst for purification of exhaust gas and its manufacturing method |
JP2008272149A (ja) * | 2007-04-27 | 2008-11-13 | Toshiba Ceramics Co Ltd | エンドトキシン除去剤およびその除去方法 |
US7879759B2 (en) * | 2009-02-16 | 2011-02-01 | Augustine Steve M | Mobile DeNOx catalyst |
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2011
- 2011-12-07 JP JP2012549716A patent/JP5787901B2/ja active Active
- 2011-12-07 CA CA2822023A patent/CA2822023C/en active Active
- 2011-12-07 US US13/994,977 patent/US8758711B2/en active Active
- 2011-12-07 WO PCT/JP2011/078265 patent/WO2012086413A1/ja active Application Filing
- 2011-12-07 CN CN2011800612144A patent/CN103260754A/zh active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH11114427A (ja) * | 1997-10-14 | 1999-04-27 | Mitsubishi Heavy Ind Ltd | 触媒用担体及び製造方法 |
JPH11300213A (ja) * | 1998-04-22 | 1999-11-02 | Mitsubishi Heavy Ind Ltd | 脱硝触媒 |
JP2000000464A (ja) * | 1998-06-12 | 2000-01-07 | Mitsubishi Heavy Ind Ltd | 触媒用担体、その製造方法、脱硝触媒及び脱硝方法 |
JP2001038206A (ja) * | 1999-08-03 | 2001-02-13 | Mitsubishi Heavy Ind Ltd | 排ガス処理用触媒、排ガス処理方法及び処理装置 |
WO2008105469A1 (ja) * | 2007-02-27 | 2008-09-04 | Nippon Shokubai Co., Ltd. | 排ガス処理用触媒および排ガス処理方法 |
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CN103260754A (zh) | 2013-08-21 |
US20130287665A1 (en) | 2013-10-31 |
JPWO2012086413A1 (ja) | 2014-05-22 |
CA2822023A1 (en) | 2012-06-28 |
US8758711B2 (en) | 2014-06-24 |
JP5787901B2 (ja) | 2015-09-30 |
CA2822023C (en) | 2016-01-05 |
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