JP7462563B2 - in-situでのPt固定によるアンモニアスリップ触媒 - Google Patents
in-situでのPt固定によるアンモニアスリップ触媒 Download PDFInfo
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- JP7462563B2 JP7462563B2 JP2020545796A JP2020545796A JP7462563B2 JP 7462563 B2 JP7462563 B2 JP 7462563B2 JP 2020545796 A JP2020545796 A JP 2020545796A JP 2020545796 A JP2020545796 A JP 2020545796A JP 7462563 B2 JP7462563 B2 JP 7462563B2
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- platinum
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- 239000003054 catalyst Substances 0.000 title claims description 270
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 152
- 229910021529 ammonia Inorganic materials 0.000 title claims description 53
- 238000011065 in-situ storage Methods 0.000 title description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 201
- 239000000203 mixture Substances 0.000 claims description 155
- 239000002808 molecular sieve Substances 0.000 claims description 91
- 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 91
- 229910052697 platinum Inorganic materials 0.000 claims description 84
- 239000000758 substrate Substances 0.000 claims description 81
- 238000000576 coating method Methods 0.000 claims description 79
- 239000011248 coating agent Substances 0.000 claims description 75
- 239000010457 zeolite Substances 0.000 claims description 66
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 59
- 229910021536 Zeolite Inorganic materials 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 51
- 230000003197 catalytic effect Effects 0.000 claims description 50
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- 239000002184 metal Substances 0.000 claims description 45
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- 238000000034 method Methods 0.000 claims description 21
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- 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 2
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- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 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
- 229910052642 spodumene Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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Description
本発明の実施形態は、本明細書に記載される触媒物品中のアンモニア酸化触媒として含まれ得る担体上の白金を含む。好ましくは、担体は、ゼオライト及び/又はSiO2-Al2O3混合酸化物を含む。いくつかの実施形態では、白金は、溶液中で、すなわちin-situでPtを固定することによって担体上に固定されてもよい。
本発明のシステムは、1つ以上のSCR触媒を含んでもよい。いくつかの実施形態では、触媒物品は、第1のSCR触媒及び第2のSCR触媒を含んでもよい。いくつかの実施形態では、第1のSCR触媒及び第2のSCR触媒は、互いに同じ配合物を含んでもよい。いくつかの実施形態では、第1のSCR触媒及び第2のSCR触媒は、互いに異なる配合物を含んでもよい。
本発明の実施形態は、(1)担体上の白金と(2)SCR触媒とのブレンドを含んでもよい。いくつかの実施形態では、ブレンド内において、SCR触媒と担体上の白金との重量比は、約3:1~約300:1、約3:1~約250:1、約3:1~約200:1、約4:1~約150:1、約5:1~約100:1、約6:1~約90:1、約7:1~約80:1、約7:1~約100:1、約8:1~約70:1、約9:1~約60:1、約10:1~約50:1、約3:1、約4:1、約5:1、約6:1、約7:1、約8:1、約9:1、約10:1、約15:1、約20:1、約25:1、約30:1、約40:1、約50:1、約75:1、約100:1、約125:1、約150:1、約175:1、約200:1、約225:1、約250:1、約275:1、又は約300:1である。
本発明の触媒は、それぞれ、フロースルー基材又はフィルタ基材を更に含んでもよい。一実施形態では、触媒は、フロースルー基材又はフィルタ基材上にコーティングされてもよく、好ましくは、ウォッシュコート手順を用いてフロースルー基材又はフィルタ基材上に堆積されてもよい。
本発明の実施形態は、第1のコーティング及び第2のコーティングを有する触媒物品に関し、第1のコーティングは、(1)担体の白金と(2)第1のSCR触媒とのブレンド、及び第2のSCR触媒を含む第2のコーティングを含む。触媒物品は、様々な構成で調製され得る。いくつかの実施形態では、コーティングは、排気ガスが第1のコーティングに接触する前に、第2のコーティングと接触するように配置されている。いくつかの実施形態では、第2のSCR触媒は、ブレンドの入口側に位置する。いくつかの実施形態では、SCR触媒は、ブレンドの出口側に位置する。
本発明のいくつかの実施形態のシステムは、アンモニアスリップ触媒の上流の排気システムに窒素系還元剤を導入するための手段を含んでもよい。窒素系還元剤を排気システムに導入するための手段は、アンモニアスリップ触媒のすぐ上流にある(例えば、窒素系還元剤を導入するための手段とアンモニアスリップ触媒との間に介在する触媒が存在しない)ことが好ましい場合がある。
本発明のいくつかの実施形態の触媒物品は、当該技術分野において既知の任意の好適な手段によって調製することができる。担体上に白金を含む触媒物品の場合、そのような白金は、溶液中で、すなわちin-situで担体上に固定することができ、別個の事前固定プロセスを必要としない。(1)担体上の白金と(2)SCR触媒とのブレンドを含むコーティングを調製するために、以下の工程が行われてもよい。
担持材料を水と組み合わせてバッチにして混合する。
白金に還元剤として作用し、かつ/又は後の焼成工程中に還元環境を作り出す有機酸を添加する。好適な有機酸の例としては、クエン酸、コハク酸、シュウ酸、アスコルビン酸、酢酸、ギ酸、及びこれらの組み合わせを挙げることができる。
有機酸と白金とのモル比が、20:1~1:1、10:1~1:1、又は5:1~1:1になるような量で、バッチに硝酸白金を追加する。
白金バッチをSCRバッチと組み合わせる。
組み合わされたバッチのレオロジー及び固形分%を調整し、空気中500℃~550℃でコーティングし、焼成する。
排気流からの排出を低減する方法は、排気流を、本明細書に記載の触媒物品と接触させることを含み得る。いくつかの実施形態では、約300℃以下の温度で排気ガスのNH3変換を改善する方法は、アンモニアを含む排気ガスを、本明細書に記載の触媒物品と接触させることを含み得る。いくつかの実施形態では、アンモニア及びNOxを含む排気ガスを処理する方法は、アンモニアを含む排気ガスを、本明細書に記載の触媒物品と接触させることを含み得る。いくつかの実施形態では、排気ガス中のアンモニアのNOxに対する重量比(ANR)は、システムの動作時間の少なくとも一部に対して>1.0である。
本発明の触媒物品は、触媒活性及び選択性の改善をもたらし得る。(1)担体上の白金族金属と(2)SCR触媒とのブレンドを有する層を含むアンモニアスリップ触媒は、N2O形成及びNOx再生成の両方において改善をもたらしたが、これらの触媒の特定のものは、欠点及び/又は制限を示す場合がある。特に、このような触媒が、白金族金属を担体上に事前に固定することを必要とする場合、このような触媒は、事前固定工程に関連する追加のコストを伴い、低温(300℃未満など)、及び困難な条件下(高いNH3スリップ及び/又は高い空間速度など)で、より低いNH3変換を示し得る。
担持材料を水と組み合わせてバッチにして混合する。
白金に還元剤として作用し、かつ/又は後の焼成工程中に還元環境を作り出す有機酸を添加する。好適な有機酸の例としては、クエン酸、コハク酸、シュウ酸、アスコルビン酸、酢酸、ギ酸、及びこれらの組み合わせを挙げることができる。
有機酸と白金とのモル比が、20:1~1:1、10:1~1:1、又は5:1~1:1になるような量で、バッチに硝酸白金を追加する。
白金バッチをSCRバッチと組み合わせる。
組み合わされたバッチのレオロジー及び固形分%を調整し、空気中500℃~550℃でコーティングし、焼成する。
*注:酸化物には総BET表面積が使用される;ゼオライトにはt-Plot外部表面積が使用される。
参照ASC:
参照例として、アルミナ底層及びSCR上層の上にPtを有する二層配合物を使用した。
ZSM-5(SAR=2000を有するMFI骨格)上の4重量%PtとCu-CHAとのブレンドを含むウォッシュコートを使用して、セラミック基材に底層を適用した。ウォッシュコートをセラミック基材に適用した後、真空を用いてウォッシュコートを基材に引き伸ばした。物品を乾燥させ、約500℃で約1時間焼成した。物品上のPt、ゼオライト、及びCuCHAの担持量は、それぞれ3g/ft3、0.045g/in3、及び0.9g/in3であった。
前述の手順により、Cu-CHA底層を有するin-situで固定されたPt-担体ブレンドと、Ptのための様々な担持材料を有するSCR上層とを有する二層配合物を調製した。
エージング条件:650℃、空気中10%H2O下、50時間
試験条件:1分間、1000ppmNH3パルス、10%O2、4.5%H2O、4.5%CO2、残部N2;SV=120,000h-1
Claims (41)
- 入口及び出口を有する基材と;
(1)担体上の白金と(2)第1のSCR触媒とのブレンドを含む第1のコーティングと;
第2のSCR触媒を含む第2のコーティングと;を含み、
前記担体が、ゼオライト又はSiO2-Al2O3混合酸化物のうちの少なくとも1つを含み、
前記白金が、前記第1のSCR触媒を含む溶液中で前記担体上に固定されている、
アンモニア及びNOxを含む排気ガスの処理に使用される触媒物品。 - 前記担体が、SiO2-Al2O3混合酸化物を含む、請求項1に記載の触媒物品。
- SiO2が、前記混合酸化物の1重量%~約70重量%、又は約40重量%~約70重量%の量で存在する、請求項2に記載の触媒物品。
- 前記担体がゼオライトを含む、請求項1に記載の触媒物品。
- 前記ゼオライトが、少なくとも50m2/gの外部表面積を含む、請求項4に記載の触媒物品。
- 前記ゼオライトが、少なくとも70m2/gの外部表面積を含む、請求項4に記載の触媒物品。
- 前記ゼオライトが、少なくとも100m2/gの外部表面積を含む、請求項4に記載の触媒物品。
- 前記ゼオライトが、約1μm未満の平均結晶サイズを有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、約0.5μm未満の平均結晶サイズを有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、約0.3μm未満の平均結晶サイズを有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、100を超えるシリカ対アルミナ比を有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、300を超えるシリカ対アルミナ比を有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、1000を超えるシリカ対アルミナ比を有する、請求項4に記載の触媒物品。
- 前記ゼオライトが、ACO、AEI、AEN、AFN、AFT、AFX、ANA、APC、APD、ATT、CDO、CHA、DDR、DFT、EAB、EDI、EPI、ERI、GIS、GOO、IHW、ITE、ITW、LEV、KFI、MER、MON、NSI、OWE、PAU、PHI、RHO、RTH、SAT、SAV、SIV、THO、TSC、UEI、UFI、VNI、YUG、ZON、BEA、MFI、及びFER、並びにこれらの混合物及び/又はインターグロースからなる骨格型の群から選択される、請求項4に記載の触媒物品。
- 前記ゼオライトが、CHA、LEV、AEI、AFX、ERI、SFW、KFI、DDR、ITE、BEA、MFI、及びFERからなる骨格型の群から選択される、請求項4に記載の触媒物品。
- 前記第2のコーティングが、前記第1のコーティングと完全に重なり合っている、請求項1に記載の触媒物品。
- 前記第2のコーティングが、前記第1のコーティングと部分的に重なり合っている、請求項1に記載の触媒物品。
- 前記第2のコーティングが、前記入口端部から前記出口端部に向かって延び、前記基材の全長未満を被覆している、請求項1に記載の触媒物品。
- 前記第1のコーティングが、前記出口端部から前記入口端部に向かって延び、前記基材の全長未満を被覆している、請求項1に記載の触媒物品。
- 前記第2のSCR触媒が、担体上の白金と前記第1のSCR触媒との前記ブレンドを含む前記コーティングの前記入口側に位置している、請求項1に記載の触媒物品。
- 前記第2のSCR触媒が、担体上の白金と前記第1のSCR触媒との前記ブレンドを含む前記コーティングの前記出口側に位置している、請求項1に記載の触媒物品。
- 前記白金が、前記ブレンド中の白金の前記担体の重量+白金の重量+前記第1のSCR触媒の重量に対して、(a)0.01~0.3重量%(両端を含む)、(b)0.03~0.2重量%(両端を含む)、(c)0.05~0.17重量%(両端を含む)、及び(d)0.07~0.15重量%(両端を含む)のうちの少なくとも1つの量で存在する、請求項1に記載の触媒物品。
- 前記第1のSCR触媒と前記担体上の白金との重量比が、これらの成分の重量を基準として、(a)0:1超かつ300:1以下、(b)3:1~300:1(両端を含む)、(c)7:1~100:1(両端を含む)、及び(d)10:1~50:1(両端を含む)のうちの少なくとも1つの範囲にある、請求項1に記載の触媒物品。
- 前記ブレンドが、パラジウム(Pd)、金(Au)、銀(Ag)、ルテニウム(Ru)、又はロジウム(Rh)のうちの少なくとも1つを更に含む、請求項1に記載の触媒物品。
- 前記第2のSCR触媒が、卑金属、卑金属の酸化物、モレキュラーシーブ、金属交換モレキュラーシーブ、混合酸化物、又はこれらの混合物である、請求項1に記載の触媒物品。
- 前記卑金属が、バナジウム(V)、モリブデン(Mo)及びタングステン(W)、クロム(Cr)、セリウム(Ce)、マンガン(Mn)、鉄(Fe)、コバルト(Co)、ニッケル(Ni)、及び銅(Cu)、並びにこれらの混合物からなる群から選択される、請求項25に記載の触媒物品。
- 少なくとも1つの卑金属促進剤を更に含む、請求項25に記載の触媒物品。
- 前記モレキュラーシーブ又は前記金属交換モレキュラーシーブが、小細孔、中細孔、大細孔、又はこれらの混合物である、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、アルミノケイ酸塩モレキュラーシーブ、金属置換アルミノケイ酸塩モレキュラーシーブ、アルミノリン酸塩(AlPO)モレキュラーシーブ、金属置換アルミノリン酸塩(MeAlPO)モレキュラーシーブ、シリコアルミノリン酸塩(SAPO)モレキュラーシーブ、及び金属置換シリコアルミノリン酸塩(MeAPSO)モレキュラーシーブ、並びにこれらの混合物からなる群から選択されるモレキュラーシーブを含む、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、ACO、AEI、AEN、AFN、AFT、AFX、ANA、APC、APD、ATT、CDO、CHA、DDR、DFT、EAB、EDI、EPI、ERI、GIS、GOO、IHW、ITE、ITW、LEV、KFI、MER、MON、NSI、OWE、PAU、PHI、RHO、RTH、SAT、SAV、SIV、THO、TSC、UEI、UFI、VNI、YUG、及びZON、並びにこれらの混合物及び/又はインターグロースからなる骨格型の群から選択される小細孔モレキュラーシーブを含む、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、CHA、LEV、AEI、AFX、ERI、SFW、KFI、DDR、及びITEからなる骨格型の群から選択される小細孔モレキュラーシーブを含む、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、AEL、AFO、AHT、BOF、BOZ、CGF、CGS、CHI、DAC、EUO、FER、HEU、IMF、ITH、ITR、JRY、JSR、JST、LAU、LOV、MEL、MFI、MFS、MRE、MTT、MVY、MWW、NAB、NAT、NES、OBW、-PAR、PCR、PON、PUN、RRO、RSN、SFF、SFG、STF、STI、STT、STW、SVR、SZR、TER、TON、TUN、UOS、VSV、WEI、及びWEN、並びにこれらの混合物及び/又はインターグロースからなる骨格型の群から選択される中細孔モレキュラーシーブを含む、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、AFI、AFR、AFS、AFY、ASV、ATO、ATS、BEA、BEC、BOG、BPH、BSV、CAN、CON、CZP、DFO、EMT、EON、EZT、FAU、GME、GON、IFR、ISV、ITG、IWR、IWS、IWV、IWW、JSR、LTF、LTL、MAZ、MEI、MOR、MOZ、MSE、MTW、NPO、OFF、OKO、OSI、RON、RWY、SAF、SAO、SBE、SBS、SBT、SEW、SFE、SFO、SFS、SFV、SOF、SOS、STO、SSF、SSY、USI、UWY、及びVET、並びにこれらの混合物及び/又はインターグロースからなる骨格型の群から選択される大細孔モレキュラーシーブを含む、請求項25に記載の触媒物品。
- 前記第2のSCR触媒が、促進Ce-Zr又は促進MnO2を含む、請求項1に記載の触媒物品。
- 前記第1のSCR触媒が、Cu-SCR触媒又はFe-SCR触媒である、請求項1に記載の触媒物品。
- 前記基材が、コーディエライト、高多孔性コーディエライト、金属基材、押出SCR、フィルタ、又はSCRFである、請求項1に記載の触媒物品。
- 請求項1に記載の触媒物品と、前記触媒物品の上流に還元剤を導入するための手段と、を含む、排気システム。
- ≦100%のNOx変換を提供する第3のSCR触媒を更に含み、前記第3のSCR触媒が、CuゼオライトSCR触媒であり、請求項1に記載の触媒物品の上流に排気ガス流が配置されている、請求項37に記載の排気システム。
- 約300℃以下の温度で排気ガスのNH3変換を改善する方法であって、アンモニアを含む排気ガスを、請求項1に記載の触媒物品と接触させることを含む、方法。
- アンモニア及びNO x を含む排気ガスを処理する方法であって、アンモニアを含む排気ガスを、請求項1に記載の触媒物品と接触させることを含む、方法。
- 前記排気ガス中のアンモニアのNO x に対する重量比が、排気システムの動作時間の少なくとも一部に対して>1.0である、請求項40に記載の方法。
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US10669910B2 (en) * | 2017-03-30 | 2020-06-02 | Johnson Matthey Public Limited Company | Platinum group metal and base metal on a molecular sieve for PNA-SCR-ASC close-coupled system |
WO2018183658A1 (en) * | 2017-03-30 | 2018-10-04 | Johnson Matthey Public Limited Company | Scr with turbo and asc/doc close-coupled system |
BR112019020349B1 (pt) * | 2017-03-30 | 2023-01-10 | Johnson Matthey Public Limited Company | Artigo catalisador |
CN111432914A (zh) * | 2017-12-13 | 2020-07-17 | 庄信万丰股份有限公司 | 具有对n2的更大选择性的改善的nh3减排 |
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2019
- 2019-03-14 JP JP2020545796A patent/JP7462563B2/ja active Active
- 2019-03-14 WO PCT/US2019/022167 patent/WO2019178303A1/en unknown
- 2019-03-14 GB GB1903489.1A patent/GB2573391B/en active Active
- 2019-03-14 CN CN201980016933.0A patent/CN111801164A/zh active Pending
- 2019-03-14 EP EP19713973.6A patent/EP3765190A1/en active Pending
- 2019-03-14 US US16/352,902 patent/US11779913B2/en active Active
- 2019-03-14 BR BR112020017976-0A patent/BR112020017976A2/pt not_active Application Discontinuation
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JP2014525822A (ja) | 2011-06-21 | 2014-10-02 | ジョンソン、マッセイ、パブリック、リミテッド、カンパニー | 触媒化基材および内燃機関用排気システム |
US20160367974A1 (en) | 2015-06-18 | 2016-12-22 | Johnson Matthey Public Limited Company | Exhaust System Without a DOC Having an ASC Acting as a DOC in a System with an SCR Catalyst Before the ASC |
US20160367937A1 (en) | 2015-06-18 | 2016-12-22 | Johnson Matthey Public Limited Company | Nh3 overdosing-tolerant scr catalyst |
US20160367975A1 (en) | 2015-06-18 | 2016-12-22 | Johnson Matthey Public Limited Company | Ammonia slip catalyst with low n2o formation |
US20160367938A1 (en) | 2015-06-18 | 2016-12-22 | Johnson Matthey Public Limited Company | Single or dual layer ammonia slip catalyst |
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Also Published As
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GB201903489D0 (en) | 2019-05-01 |
JP2021517858A (ja) | 2021-07-29 |
GB2573391A (en) | 2019-11-06 |
WO2019178303A1 (en) | 2019-09-19 |
BR112020017976A2 (pt) | 2020-12-22 |
RU2020131781A (ru) | 2022-03-28 |
US11779913B2 (en) | 2023-10-10 |
GB2573391A8 (en) | 2020-08-19 |
EP3765190A1 (en) | 2021-01-20 |
CN111801164A (zh) | 2020-10-20 |
GB2573391B (en) | 2022-10-26 |
US20190283011A1 (en) | 2019-09-19 |
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