JP7158453B2 - 高温scr触媒としての8員環小孔分子ふるい - Google Patents
高温scr触媒としての8員環小孔分子ふるい Download PDFInfo
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- JP7158453B2 JP7158453B2 JP2020189340A JP2020189340A JP7158453B2 JP 7158453 B2 JP7158453 B2 JP 7158453B2 JP 2020189340 A JP2020189340 A JP 2020189340A JP 2020189340 A JP2020189340 A JP 2020189340A JP 7158453 B2 JP7158453 B2 JP 7158453B2
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- 239000002808 molecular sieve Substances 0.000 title claims description 117
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims description 117
- 239000003054 catalyst Substances 0.000 title claims description 113
- 239000011148 porous material Substances 0.000 title claims description 74
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- 239000010457 zeolite Substances 0.000 claims description 63
- 238000000034 method Methods 0.000 claims description 61
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 58
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 49
- 229910021536 Zeolite Inorganic materials 0.000 claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 31
- 239000000758 substrate Substances 0.000 claims description 28
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 27
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- WFPZPJSADLPSON-UHFFFAOYSA-N dinitrogen tetraoxide Chemical compound [O-][N+](=O)[N+]([O-])=O WFPZPJSADLPSON-UHFFFAOYSA-N 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 4
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- 238000006243 chemical reaction Methods 0.000 description 36
- UNYSKUBLZGJSLV-UHFFFAOYSA-L calcium;1,3,5,2,4,6$l^{2}-trioxadisilaluminane 2,4-dioxide;dihydroxide;hexahydrate Chemical compound O.O.O.O.O.O.[OH-].[OH-].[Ca+2].O=[Si]1O[Al]O[Si](=O)O1.O=[Si]1O[Al]O[Si](=O)O1 UNYSKUBLZGJSLV-UHFFFAOYSA-L 0.000 description 35
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
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- 239000005431 greenhouse gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002603 lanthanum Chemical class 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229910052670 petalite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052701 rubidium Inorganic materials 0.000 description 1
- IGLNJRXAVVLDKE-UHFFFAOYSA-N rubidium atom Chemical compound [Rb] IGLNJRXAVVLDKE-UHFFFAOYSA-N 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052851 sillimanite Inorganic materials 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
- 229910052645 tectosilicate Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- ZJHHPAUQMCHPRB-UHFFFAOYSA-N urea urea Chemical compound NC(N)=O.NC(N)=O ZJHHPAUQMCHPRB-UHFFFAOYSA-N 0.000 description 1
Images
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- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
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- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
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- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
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- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
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- B01J37/02—Impregnation, coating or precipitation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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Description
鉄で促進化した小孔分子ふるいは、5質量%を超える鉄を含む。鉄で促進化した8員環小孔分子ふるいのFe含有量は、F2O3として計算され、具体的な実施形態において、揮発性物質なしを基準として報告される、少なくとも約5.1質量%、さらにいっそう具体的な実施形態において、少なくとも約5.5、又は6質量%である。さらにいっそう具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいのFe含有量は、F2O3として計算され、それぞれの場合、揮発性物質なしを基準として報告される、か焼した分子ふるいの総質量に基づいて、約5.1質量%~約15質量%の範囲、又は~約10質量%の範囲、さらに具体的には~約9質量%の範囲、さらにいっそう具体的には~約8質量%の範囲である。したがって、具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいの範囲は、F2O3として計算される、約5.1~15、5.1~10、5.1~9、5.1~8、5.1~7、5.1~6、5.5~15、5.5~10、5.5~9、5.5~8、5.5、6~10、6~9、6~8質量%である。全ての質量%の値は、揮発性物質なしを基準として報告される。
具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいは、80000h-1のガス時間空間速度で測定される、少なくとも50%の350℃での時効後のNOx変換を示す。具体的な実施形態おいて、鉄で促進化した8員環小孔分子ふるいは、80000h-1のガス時間空間速度で測定される、少なくとも70%の450℃での時効後のNOx変換を示す。さらに具体的には、500ppmNO、500ppmNH3、10%O2、5%H2O、残余のN2のガス混合物中で、最大NH3-スリップ条件で、定常状態条件下で、80000h-1のガス時間容積基準空間速度で測定される、350℃での時効後のNOx変換は、少なくとも55%であり、450℃で少なくとも75%であり、さらにいっそう具体的には、350℃での時効後のNOx変換は、少なくとも60%であり、550℃で少なくとも80%である。芯材(core)は、チューブ炉内で、4,000h-1の空間速度で、10%H2O、10%O2、残余のN2を含有するガス流中で、750℃で5時間、熱水時効された。
具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいは、か焼した分子ふるいの総質量に基づいて2質量%未満のナトリウム含有量(揮発性物質なしを基準として、Na2Oとして報告される)を有する。さらに具体的な実施形態において、ナトリウム含有量は、1質量%未満、さらにいっそう具体的には2000ppm未満、さらにいっそう具体的には1000ppm未満、さらにいっそう具体的には500ppm未満、最も具体的には100ppm未満である。
具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいは、0.7未満のナトリウムのアルミニウムに対する元素比を有する。さらに具体的な実施形態において、ナトリウムのアルミニウムに対する元素比は、0.35未満、さらにいっそう具体的には0.007未満、さらにいっそう具体的には0.03未満、及びさらにいっそう具体的には0.02未満である。
CHA構造を有する8員環小孔分子ふるいの従来型の合成として、言及され得るものにおいては、シリカ源、アルミナ源、及び構造指向剤が、アルカリ水性条件下で混合される。典型的なシリカ源は、種々の種類のヒュームドシリカ、沈殿シリカ、及びコロイド状シリカ、並びにケイ素アルコキシドを含む。典型的なアルミナ源は、ベーマイト、擬似ベーマイト(pseudo-boehmite)、水酸化アルミニウム、硫酸アルミニウム又はアルミン酸ナトリウム等のアルミニウム塩、及びアルミニウムアルコキシドを含む。水酸化ナトリウムが、典型的に反応混合物に添加される。この合成用の典型的な構造指向剤は、アダマンチルトリメチルアンモニウム水酸化物であるが、しかし他のアミン及び/又は第4級アンモニウム塩が、後者の構造指向剤に置き換え、又は加えられ得る。反応混合物は、圧力容器内で、撹拌しながら加熱され、結晶SSZ-13生成物を生じる。典型的な反応温度は、100及び200℃の範囲内であり、具体的な実施形態においては、135及び170℃の間である。典型的な反応時間は、1時間及び30日間の間であり、具体的な実施形態においては、10時間及び3日間の間である。
任意に、得られたアルカリ金属分子ふるいは、NH4-交換され、NH4-チャバザイトを形成する。NH4イオン交換は、当技術分野で知られた種々の技術、例えば、Bleken, F.;Bjorgen, M.;Palumbo, L.; Bordiga, S.; Svelle, S.; Lillerud, K.-P.; and Olsbye, U. Topics in Catalysis 52, (2009), 218-228に従って実行され得る。
一以上に実施形態によれば、鉄で促進化した8員環小孔分子ふるいを含む選択的触媒還元用触媒の合成方法が提供される。特に、その触媒は、鉄で促進化したSSZ-13を含む。鉄で促進化したCHA型ゼオライト、特にSSZ-13及びSSZ-62等のCHA型アルミノケイ酸塩ゼオライトの合成が提供される。
具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいは、少なくとも約400m2/g、さらに具体的には少なくとも約550m2/g、さらにいっそう具体的には少なくとも約650m2/gのDIN66131に従って測定されたBET表面積を示す。具体的な実施形態において、鉄で促進化した8員環小孔分子ふるいは、約400~約750m2/gの範囲、さらに具体的には約500~約750m2/gの範囲のBET表面積を示す。
本発明の実施形態に従う鉄で促進化した8員環小孔分子ふるいは、上記の分離技術、例えばデカンテーション、ろ過、遠心分離、又は噴霧等から得られた粉末又は噴霧された材料の形態で提供され得る。一般に、粉末又は噴霧された材料は、例えば、所望の形状、例えば錠剤、円柱、球等の成形品を得るための適切な締め固めによって、如何なる他の化合物なしに成形され得る。
したがって、本発明はまた、窒素酸化物(NOx)を選択的に還元する方法であって、窒素酸化物(NOx)を含有するガス流、例えば、工業プロセス又は工程において形成される排ガス、具体的な実施形態においては、アンモニア及び/又は尿素も含有するガス流が、本発明の実施形態に従う鉄で促進化した8員環小孔分子ふるいを含む選択的触媒還元用触媒と接触される方法にも関連する。
本発明の実施形態は、任意にアンモニア、尿素、及び/又は炭化水素等の還元剤、具体的な実施形態においては、アンモニア及び/又は尿素を含有する排ガス流、並びに基板上に配置された、鉄で促進化した8員環小孔分子ふるいを含有する選択的触媒還元用触媒製品、並びに二次排ガス処理要素、例えば煤フィルター及びディーゼル酸化触媒等を含む排ガス処理システムにも関連する。
窒素酸化物のSCRを促進するため、適切な金属が、ゼオライト材料中へ交換される。適切な金属は、限定されないが、銅、鉄、コバルト、ニッケル、マンガン、セリウム、白金、パラジウム、ロジウム及びそれらの組合せを含む。具体的な実施形態において、鉄が、ゼオライト中へイオン交換される。金属はゼオライトの製造の後に交換され得る。一以上の実施形態によれば、適合したコロイド(tailored colloid)が、構造指向剤、シリカ源、アルミナ源及び金属イオン(例えば、銅)源を含むように、金属の少なくとも一部が、適合したコロイド中に含まれ得る。
鉄は、アルカリ金属又はNH4の8員環小孔分子ふるい中へイオン交換される。具体的な実施形態において、鉄は、アルカリ金属又はNH4-チャバザイト中へイオン交換され、Fe-チャバザイトを形成する。本発明の実施形態によれば、本発明の分子ふるい材料(ゼオライト材料又は非ゼオライト材料であり得る)が、触媒プロセスに、例えば、触媒及び/又は触媒担体として、さらに具体的には触媒として使用される。一般に、本発明の分子ふるい材料は、任意の考えられる触媒プロセスであり、少なくとも1種の有機化合物、さらに具体的には少なくとも1個の炭素-炭素及び/又は炭素-酸素及び/又は炭素-窒素結合を含む有機化合物、さらに具体的には少なくとも1個の炭素-炭素及び/又は炭素-酸素結合を含む有機化合物、さらにいっそう具体的には少なくとも1個の炭素-炭素結合を含む有機化合物の変換を伴うプロセスにおいて使用され得る。本発明の特に具体的な実施形態において、分子ふるい材料は、メタノールからオレフィンへの(MTO)反応、エチレンからプロピレンへの(ETP)反応、並びにメタノール及びエチレンの共反応(CME)の任意の一以上の反応における触媒及び/又は触媒担体として使用される。そのプロセスは、化合物を本発明の実施形態に従う触媒と接触させることを伴う。
[実施例1:Fe-CHA試料の調製]
鉄は、pH約4、約2時間、約60℃でのFeイオン交換を通して、ナトリウムCHA中へ取り込ませる。その後、混合物は脱イオン水で洗浄し、ろ過し、真空/空気乾燥する。試料を、1(実施例1A)、2(実施例1B)、3(実施例1C)、5(実施例1D)、及び10(実施例1E)質量%のFe負荷量を狙って調製した。ウォッシュコートを、目標45質量%固形分スラリーを生成するように、水とFeゼオライトを混合することによって調製した。スラリーは均質である。粒径を検査し、D90が12ミクロン未満であることを確保する。バインダーとして、約5%ZrO2を、酢酸ジルコニウム溶液として添加する。
別法として、現場法が、鉄で促進化した8員環小孔分子ふるいを調製するために使用され得る。例えば、適切な濃度のFe塩溶液が、水素又はアンモニウム型のSSZ-13の混合スラリーに滴加される。混合物を一晩回転させ(roll)、適切な粒径に粉状化(mill)し、実施例1に記載したようにハニカム基板上にウォッシュコートコーティングした。実施例2は、1質量%の鉄を含有した。
窒素酸化物選択的触媒還元(SCR)効率及び選択性を、500ppmのNO、500ppmのNH3、10%O2、5%H2O、残余のN2を含有する供給ガス混合物を、1”D×3”L触媒コアを含有する定常状態の反応器へ加えることで測定した。反応は、80,000hr-1の空間速度で、200℃~600℃の温度範囲をわたって行なった。
図2は、それぞれ、1、2及び3質量%の鉄を含有する実施例1A、1B及び1Cについて、NOx変換を比較する。結果は、Fe-負荷量で、高温性能が向上することを示す。
実施例1B(2質量%)、1C(3質量%)、1D(5質量%)、及び1E(10質量%)のFe負荷量を、触媒を出るNOx濃度及びN2O濃度(又はN2O生産(N2O make))について試験した。N2Oは温室効果ガスであり、触媒を出るN2Oは可能な限り低いことが望まれる。図3は、NOx変換の結果を示す。5%及び10%を含む試料は、350℃~600℃の領域の高温だけでなく、200℃~350℃の領域の低温で、有意により良好なNOx変換を示した。550℃で、10%Fe負荷量の試料のNOx変換は、数パーセントより高い水準であった。
Claims (5)
- 還元剤の存在下で、N 2 Oの選択的触媒還元及びNO、N 2 O 3 、N 2 O 4 、N 2 O 5 及びNO 3 から成る群から選ばれる、少なくとも1種の窒素酸化物の選択的触媒還元を行うための選択的触媒還元用触媒であって、
CHA結晶構造を有し、及び
揮発性物質なしを基準として報告される、か焼したゼオライトの総質量に基づいて、Fe 2 O 3 として計算して、5.1~10質量%の範囲の量の鉄で促進化したアルミノケイ酸塩ゼオライトから選ばれる8員環小孔分子ふるいを含み、
該8員環小孔分子ふるいは、イオン交換によって鉄のみを含み、及び
前記8員環小孔分子ふるいは、10~100の範囲の、シリカのアルミナに対する比を有することを特徴とする選択的触媒還元用触媒。 - CHA結晶構造を有するアルミノケイ酸塩ゼオライトが、鉄で促進化したSSZ-13、及び鉄で促進化したSSZ-62から選択されることを特徴とする請求項1に記載の触媒。
- ハニカム基板上に被着したウォッシュコート中に請求項1に記載の触媒を含む触媒製品。
- 前記ハニカム基板が、フロースルー基板を含む請求項3に記載の触媒製品。
- 窒素酸化物を選択的に還元する方法であって、窒素酸化物を含有するガス流を、請求項1に記載の選択的触媒還元用触媒と接触させることを含む方法。
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CN104755164A (zh) | 2015-07-01 |
US9011807B2 (en) | 2015-04-21 |
CA2888517C (en) | 2020-10-06 |
CN110496642A (zh) | 2019-11-26 |
RU2704617C2 (ru) | 2019-10-30 |
JP2021049524A (ja) | 2021-04-01 |
WO2014062949A1 (en) | 2014-04-24 |
ZA201503450B (en) | 2017-08-30 |
JP2015533342A (ja) | 2015-11-24 |
CA2888517A1 (en) | 2014-04-24 |
KR102134127B1 (ko) | 2020-07-15 |
US20150071851A1 (en) | 2015-03-12 |
PL2908946T3 (pl) | 2021-03-08 |
EP2908946A1 (en) | 2015-08-26 |
US20140112854A1 (en) | 2014-04-24 |
RU2767067C1 (ru) | 2022-03-16 |
JP7086809B2 (ja) | 2022-06-20 |
JP6664961B2 (ja) | 2020-03-13 |
US9302256B2 (en) | 2016-04-05 |
RU2015118442A (ru) | 2016-12-10 |
KR20150072441A (ko) | 2015-06-29 |
EP2908946A4 (en) | 2016-06-29 |
EP2908946B1 (en) | 2020-09-09 |
JP2019030875A (ja) | 2019-02-28 |
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