JP5836966B2 - 過渡NOx排気ガスを処理するための触媒 - Google Patents
過渡NOx排気ガスを処理するための触媒 Download PDFInfo
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- JP5836966B2 JP5836966B2 JP2012540510A JP2012540510A JP5836966B2 JP 5836966 B2 JP5836966 B2 JP 5836966B2 JP 2012540510 A JP2012540510 A JP 2012540510A JP 2012540510 A JP2012540510 A JP 2012540510A JP 5836966 B2 JP5836966 B2 JP 5836966B2
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- molecular sieve
- catalyst
- exhaust gas
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- catalyst composition
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- 239000003054 catalyst Substances 0.000 title claims description 161
- 230000001052 transient effect Effects 0.000 title description 17
- 239000002808 molecular sieve Substances 0.000 claims description 192
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 192
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 83
- 239000007789 gas Substances 0.000 claims description 82
- 239000000203 mixture Substances 0.000 claims description 55
- 239000010949 copper Substances 0.000 claims description 39
- 229910052742 iron Inorganic materials 0.000 claims description 37
- 239000003638 chemical reducing agent Substances 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 35
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 27
- 229910052802 copper Inorganic materials 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 61
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 50
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- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 4
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- GHOKWGTUZJEAQD-ZETCQYMHSA-N (D)-(+)-Pantothenic acid Chemical compound OCC(C)(C)[C@@H](O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-ZETCQYMHSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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- 229920006395 saturated elastomer Polymers 0.000 description 3
- 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 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 229910052785 arsenic Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 239000002638 heterogeneous catalyst Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
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- 229910052749 magnesium Inorganic materials 0.000 description 2
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- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
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- 229910052719 titanium Inorganic materials 0.000 description 2
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 238000004435 EPR spectroscopy Methods 0.000 description 1
- 229910018879 Pt—Pd Inorganic materials 0.000 description 1
- 230000010757 Reduction Activity Effects 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- FYAMXEPQQLNQDM-UHFFFAOYSA-N Tris(1-aziridinyl)phosphine oxide Chemical compound C1CN1P(N1CC1)(=O)N1CC1 FYAMXEPQQLNQDM-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
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- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- VZTDIZULWFCMLS-UHFFFAOYSA-N ammonium formate Chemical compound [NH4+].[O-]C=O VZTDIZULWFCMLS-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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- 229910001603 clinoptilolite Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
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- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
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- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
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- 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
- 238000002407 reforming Methods 0.000 description 1
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- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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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
- 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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- B01J29/88—Ferrosilicates; Ferroaluminosilicates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20761—Copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/50—Zeolites
- B01D2255/502—Beta zeolites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/90—Physical characteristics of catalysts
- B01D2255/903—Multi-zoned catalysts
- B01D2255/9032—Two zones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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
- B01J2029/062—Mixtures of different aluminosilicates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2370/00—Selection of materials for exhaust purification
- F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
- F01N2370/04—Zeolitic material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2510/00—Surface coverings
- F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
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- 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
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Description
(x+y)M(2/n)O・xFe2O3・yAl2O3・zSiO2・wH2O
ここで、nはカチオンMの原子値で、x、yおよびzはFe2O3、Al2O3およびSiO2それぞれのモル分率で、x+y+z=1で、wは少なくとも0の数字で、z/xは20〜300、yは0であり得、任意に、z/yは少なくとも100である。
実施例1−新鮮な3重量%のCu/SSZ−13
(アルミノケイ酸塩CHA)触媒の製造法
商業的に使用可能なSSZ−13ゼオライト(CHA)は、NH4NO3溶液でNH4 +イオン交換後、フィルタリングされた。結果物質は、撹拌によりCu(NO3)2の液状溶液に添加された。スラリーは、フィルタリングされ、洗浄後、乾燥した。この過程は、所望の金属荷重を達成するために繰り返し可能である。最終産物はか焼された。本実施例によって製造された物質は、ここで「新鮮」と記載される。
商業的に使用可能なベータゼオライトは、NH4NO3溶液でNH4 +イオン交換後、フィルタリングされた。結果物質は、撹拌によりFe(NO3)3の液状溶液に添加された。スラリーは、フィルタリングされ、洗浄後、乾燥した。この過程は、所望の金属荷重を達成するために繰り返し可能である。最終産物はか焼された。本実施例によって製造された物質は、ここで「新鮮」と記載される。
実施例1および2によって製造されたサンプルの物理的混合により新鮮でエージングされた重量比1:3のFe/ベータ:Cu/SSZ−13の分離型物理的ブレンドが製造された。同様に、重量比1:3のBEA−フェロシリケート:CuSSZ−13の物理的ブレンドが製造された。
実施例1、2および3によって製造された新鮮な粉末サンプルの活性度が、60,000hr−1の空間速度で、125ppmのNO、375ppmのNO2、750ppmのNH3、14%のO2、4.5%のH2O、4.5%のCO2、N2に均衡が維持されたガス混合を用いて、実験室装置にて250℃でテストされた。テストは、20ppmのNH3がサンプルの下流で検出された時に停止した。結果は、図3に示された。
1:3(重量)のBEA−フェロシリケート:CuSSZ−13組合せの3つのサンプルが製造され、ブレンド、区域および層として基材上に分離されてコーティングされた。3つのコーティングされた基材は、NO:NO2比が約50:50の場合を除けば、実施例4で説明されたのと類似のテスト環境に露出する。結果は、図5に示された。
1:3(重量)のFeBEA:CuSSZ−13組合せのサンプルと1:3(重量)のBEA−フェロシリケート:CuSSZ−13の3つのサンプルが製造され、基材上に分離されてコーティングされた。FeBEA:CuSSZ−13組合せは、ブレンドでコーティングされ、BEA−フェロシリケート:CuSSZ−13組合せのサンプルは、ブレンド、区域および層として分離されてコーティングされた。サンプルのそれぞれは、NH3の投入(20ppmのスリップ)とともに混合された偽ディーゼル排気ガスに露出した。露出する間の平均N2Oの形成が記録され、図6aと図6bに示された。
BEA−フェロシリケート:CuSSZ−13の4つのサンプルが製造され、NH3還元剤とともに混合された偽ディーゼル排気ガスに露出する間、NOx変換能力がテストされた。テストは、250℃の温度と約60,000/hourのガス空間速度で行われた。結果は、下記表のとおりである。ここで、参照(「ref.」)触媒は、CuSSZ−13であり、「低充填」は、排気ガスの約0.5g/L以下のNH3水準であり、「高充填」は、排気ガスの約1g/L超過のNH3水準である。
FeBEA、CuSSZ−13およびBEA−フェロシリケートのサンプルが用意され、指示された組合せで混合可能であり、多重組合せが図8aないし図8cに示されている。凡例において、触媒を通るガス流れに対して上流に位置する1番目の名前の要素とともに、比は重量で与えられ、ブレンドは挿入語句で表され、区域は「//」で指示される。組合せと多重組合せのそれぞれは、NH3還元剤を含む偽ディーゼル排気ガス流れに露出した。排気ガスにおけるNO:NO2比は、異なる条件で触媒をテストするために、NOのみ存在、50:50のNO:NO2(重量)から、75%のNO2(重量)に変化した。各組合せまたは多重組合せは、NH3充填水準の機能としてNOx変換率(N2Oの形成に対して修正)に対して評価された。
Claims (7)
- 排気ガス処理用触媒組成物であって、
(a)0.5〜5重量%の置換された又は自由な鉄を含む、BEA構造を有する第1モレキュラーシーブ、及び
(b)0.5〜5重量%の置換された又は自由な銅を含む、CHA構造を有する第2モレキュラーシーブを含み、
ここで、前記第1モレキュラーシーブと前記第2モレキュラーシーブは、0.1〜1.0の重量比で存在する、触媒組成物。 - 前記第2モレキュラーシーブが、8〜150のシリカ対アルミナ比を有する、請求項1に記載の触媒組成物。
- 触媒物品であって、
a.請求項1に記載の触媒組成物、及び
b.前記触媒組成物がモノリス基材上に又は内に包含されている、前記モノリス基材を含み、
ここで、前記第1モレキュラーシーブが、第1区域に位置し、及び前記第2モレキュラーシーブが、第2区域に位置し、及び、ここで、前記第1区域の少なくとも一部が、前記触媒組成物を通過するガス流れの意図された方向に対して、第2区域の上流にあり、前記第1区域が、前記基材に対して前記第2区域と重ならず、及び、前記第2区域が、前記基材に対して前記第1区域と重ならない、触媒物品。 - 触媒物品であって、
a.請求項1に記載の触媒組成物、及び
b.前記触媒組成物がモノリス基材上に又は内に包含されている、前記モノリス基材を含み、
ここで、第1モレキュラーシーブが、第1区域に位置し、及び前記第2モレキュラーシーブが、第2区域に位置し、及び、ここで、前記第2区域が、前記触媒組成物を通過するガス流れの意図された方向に対して、前記第1区域の下に位置する、触媒物品。 - 触媒物品であって、
a.請求項1に記載の触媒組成物、及び
b.モノリス基材を含み、
ここで、前記第1及び第2モレキュラーシーブが混合物としてモノリス基材上に位置する、触媒物品。 - 排気ガスを処理するための方法であって、
a.請求項1に記載の触媒組成物の存在下、150℃〜750℃の温度で、NOxの第1濃度を有する供給排気ガス流に窒素含有還元剤を接触させ、
b.NOxの第2濃度を有する処理された排気ガス流を生成するために、前記供給排気ガスの少なくとも一部の前記NOxを還元し、そして、NOxの前記第2濃度は、NOxの前記第1濃度よりも低く、
ここで、供給排気ガス流が、0.3より低いNO:NO2比を有し、ここで、前記窒素含有還元剤が、供給排気ガスの1Lあたり0.5gより低い濃度で存在し、そして、ここで、前記排気ガスが、前記第2モレキュラーシーブに接触する前に、前記第1モレキュラーシーブに接触する、排気ガスを処理するための方法。 - 排気ガスを処理するための方法であって、
a.請求項1に記載の触媒組成物の存在下、150℃〜750℃の温度で、NOxの第1濃度を有する供給排気ガス流に窒素含有還元剤を接触させ、
b.NOxの第2濃度を有する処理された排気ガス流を生成するために、前記供給排気ガスの少なくとも一部の前記NOxを還元し、そして、NOxの前記第2濃度は、NOxの前記第1濃度よりも低く、
ここで、前記触媒が、前記第1モレキュラーシーブと前記第2モレキュラーシーブとの混合物として存在する、排気ガスを処理するための方法。
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