RU2017107533A - Выхлопная система с модифицированной ловушкой nox в условиях обедненной смеси - Google Patents
Выхлопная система с модифицированной ловушкой nox в условиях обедненной смеси Download PDFInfo
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- RU2017107533A RU2017107533A RU2017107533A RU2017107533A RU2017107533A RU 2017107533 A RU2017107533 A RU 2017107533A RU 2017107533 A RU2017107533 A RU 2017107533A RU 2017107533 A RU2017107533 A RU 2017107533A RU 2017107533 A RU2017107533 A RU 2017107533A
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- Prior art keywords
- exhaust system
- catalyst
- metal
- oxide
- modified
- Prior art date
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- 239000000203 mixture Substances 0.000 title claims 4
- 239000003054 catalyst Substances 0.000 claims 15
- 229910052751 metal Inorganic materials 0.000 claims 11
- 239000002184 metal Substances 0.000 claims 11
- 229910021536 Zeolite Inorganic materials 0.000 claims 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims 8
- 230000003647 oxidation Effects 0.000 claims 8
- 238000007254 oxidation reaction Methods 0.000 claims 8
- 239000010457 zeolite Substances 0.000 claims 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims 6
- 239000004202 carbamide Substances 0.000 claims 6
- 239000007789 gas Substances 0.000 claims 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 4
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims 4
- 239000003463 adsorbent Substances 0.000 claims 4
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims 4
- 150000001342 alkaline earth metals Chemical class 0.000 claims 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims 4
- 229910001935 vanadium oxide Inorganic materials 0.000 claims 4
- 238000002347 injection Methods 0.000 claims 3
- 239000007924 injection Substances 0.000 claims 3
- 229910052809 inorganic oxide Inorganic materials 0.000 claims 3
- 239000000463 material Substances 0.000 claims 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims 3
- -1 platinum group metals Chemical class 0.000 claims 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 229910052783 alkali metal Inorganic materials 0.000 claims 2
- 150000001340 alkali metals Chemical class 0.000 claims 2
- 229910021529 ammonia Inorganic materials 0.000 claims 2
- 238000010531 catalytic reduction reaction Methods 0.000 claims 2
- 229910000420 cerium oxide Inorganic materials 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 claims 2
- 239000000395 magnesium oxide Substances 0.000 claims 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 2
- 238000000034 method Methods 0.000 claims 2
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 claims 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims 2
- 229910052697 platinum Inorganic materials 0.000 claims 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims 2
- 150000002910 rare earth metals Chemical class 0.000 claims 2
- 239000000758 substrate Substances 0.000 claims 2
- 229910001930 tungsten oxide Inorganic materials 0.000 claims 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 229910052788 barium Inorganic materials 0.000 claims 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 229910001657 ferrierite group Inorganic materials 0.000 claims 1
- 239000000446 fuel Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 239000011572 manganese Substances 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 229910052763 palladium Inorganic materials 0.000 claims 1
- 230000000737 periodic effect Effects 0.000 claims 1
- 229910052703 rhodium Inorganic materials 0.000 claims 1
- 239000010948 rhodium Substances 0.000 claims 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910052596 spinel Inorganic materials 0.000 claims 1
- 239000011029 spinel Substances 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
Classifications
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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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
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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
- B01D53/922—Mixtures of carbon monoxide or hydrocarbons and nitrogen oxides
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- 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
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- B01D53/9409—Nitrogen oxides
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- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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- F01N3/2066—Selective catalytic reduction [SCR]
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Claims (26)
1. Выхлопная система для обработки выхлопных газов двигателя внутреннего сгорания, включающая модифицированную ловушку NOx в условиях обедненной смеси (LNT), систему впрыска мочевины и катализатор аммиак-селективного каталитического восстановления (NH3-SCR), при этом, модифицированная LNT накапливает NOx при температуре менее, примерно, 200°С и высвобождает накопленные NOx при температуре более, примерно, 200°С, и модифицированная LNT включает:
(а) первый слой, содержащий компонент - адсорбент NOx и один или более металлов платиновой группы; и
(b) второй слой, содержащий зону катализатора окисления дизеля, содержащую металл платиновой группы, цеолит и, необязательно, щелочноземельный металл; и зону окисления NO, содержащую металл платиновой группы и носитель.
2. Выхлопная система по п. 1, в которой системы впрыска мочевины обеспечивает впрыск мочевины при температуре более, примерно, 180°С.
3. Выхлопная система по п. 1 или 2, в которой компонент - адсорбент NOx включает щелочноземельный металл, щелочной металл, редкоземельный металл и их смеси.
4. Выхлопная система по п. 3, в которой щелочноземельный металл, щелочной металл, редкоземельный металл и их смеси нанесены на подложку из материала - неорганического оксида.
5. Выхлопная система по п. 4, в которой материал - неорганический оксид представляет собой материал, содержащий оксид церия, или оксид магния/оксид алюминия.
6. Выхлопная система по п. 5, в которой оксид магния/оксид алюминия представляет собой алюмомагнезиальную шпинель.
7. Выхлопная система по любому из предшествующих пунктов, в которой компонент - адсорбент NOx включает барий.
8. Выхлопная система по любому из пп. 1-7, в которой один или более металлов платиновой группы первого слоя выбраны из группы, состоящей из палладия, платины, родия и их смесей.
9. Выхлопная система по любому из пп. 1-8, в которой цеолит зоны катализатора окисления дизеля выбран из группы типов структуры, состоящей из AEI, CHA, LEV, BEA, FAU, и MFI.
10. Выхлопная система по любому из пп. 1-9, в которой зона катализатора окисления дизеля дополнительно включает подложку из неорганического оксида, содержащую оксид алюминия или оксид алюминия с добавлением оксида кремния.
11. Выхлопная система по любому из пп. 1-10, в которой носитель зоны окисления NO содержит оксид алюминия и оксид церия.
12. Выхлопная система по любому из пп. 1-11, в которой зона окисления NO дополнительно включает марганец.
13. Выхлопная система по любому из пп. 1-12, в которой катализатор NH3-SCR выбран из группы, состоящей из катализатора оксид ванадия/оксид титана, катализатора оксид ванадия/оксид вольфрама/оксид титана или катализатора металл/цеолит.
14. Выхлопная система по п. 13, в которой металл/цеолит включает металл, выбранный из группы, состоящей из железа и меди, и цеолит, выбранный из группы типов структуры, состоящей из AEI, CHA, LEV, BEA (например, бета-цеолит) или FER (например, ферриерит).
15. Выхлопная система по любому из пп. 1-14, в которой катализатор NH3-SCR представляет собой аммиак-селективный фильтр каталитического восстановления (NH3-SCRF).
16. Выхлопная система по п. 15, в которой NH3-SCRF включает фильтр с катализатором NH3-SCR, выбранным из группы, состоящей из катализатора оксид ванадия/оксид титана, катализатора оксид ванадия/оксид вольфрама/оксид титана или катализатора металл/цеолит.
17. Модифицированная ловушка NOx в условиях обедненной смеси (LNT), включающая:
(а) первый слой, содержащий компонент - адсорбент NOx и один или более металлов платиновой группы; и
(b) второй слой, содержащий зону катализатора окисления дизеля, содержащую металл платиновой группы, цеолит и, необязательно, щелочноземельный металл; и зону окисления NO, содержащую металл платиновой группы и носитель.
18. Способ обработки выхлопных газов двигателя внутреннего сгорания, содержащий этапы, на которых:
(а) пропускают выхлопные газы через модифицированную ловушку NOx в условиях обедненной смеси (LNT) по п. 17 для удаления из выхлопных газов оксидов азота (NOx) при температуре менее, примерно, 200°С и высвобождения NOx при температуре более, примерно, 200°С;
(b) впрыскивают в выхлопные газы мочевину ниже по потоку технологической линии от модифицированной LNT при температуре более, примерно, 180°С; и
(с) пропускают выхлопные газы, содержащие высвобожденные из модифицированной LNT NOx и мочевину, над катализатором NH3-SCR для преобразования NOx в азот.
19. Способ по п. 18, дополнительно содержащий периодическое воздействие на модифицированную LNT температуры более, примерно, 500°С в условиях высокого соотношения воздух:топливо для удаления серы, накопившейся в модифицированной LNT.
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