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RU2018101694A - Катализатор скв, допускающий передозировку nh3 - Google Patents

Катализатор скв, допускающий передозировку nh3 Download PDF

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Publication number
RU2018101694A
RU2018101694A RU2018101694A RU2018101694A RU2018101694A RU 2018101694 A RU2018101694 A RU 2018101694A RU 2018101694 A RU2018101694 A RU 2018101694A RU 2018101694 A RU2018101694 A RU 2018101694A RU 2018101694 A RU2018101694 A RU 2018101694A
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Russia
Prior art keywords
catalyst
ammonia
scr catalyst
catalytic
coating
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RU2018101694A
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English (en)
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RU2018101694A3 (ru
RU2715539C2 (ru
Inventor
Цзин ЛУ
Хай-Ин ЧЭНЬ
Джозеф ФЕДЕЙКО
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Джонсон Мэтти Паблик Лимитед Компани
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Publication of RU2018101694A3 publication Critical patent/RU2018101694A3/ru
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • 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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    • B01J23/8926—Copper and noble metals
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    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
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    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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Claims (15)

1. Каталитическое изделие, содержащее подложку, имеющую вход и выход, и покрытую первым покрытием, содержащим смесь платины на носителе с низким накоплением аммиака и первого катализатора СКВ; вторым покрытием, содержащим второй катализатор СКВ; где второе покрытие, по меньшей мере, частично перекрывает первое покрытие, и где первый катализатор СКВ представляет собой катализатор Сu-СКВ или Fе-СКВ.
2. Каталитическое изделие по п. 1, в котором второе покрытие полностью перекрывает первое покрытие.
3. Каталитическое изделие по п. 1, в котором носитель с низким накоплением аммиака представляет собой кремнистый носитель, содержащий диоксид кремния или цеолит при отношении диоксида кремния к оксиду алюминия, по меньшей мере, ≥100.
4. Каталитическое изделие по п. 1, в котором смесь, содержащая платину на носителе с низким накоплением аммиака, дополнительно содержит, по меньшей мере, один элемент из палладия (Рd), золота (Аu), серебра (Аg), рутения (Ru) или родия (Rh).
5. Каталитическое изделие по п. 1, в котором первый катализатор СКВ содержит Сu или Fе, нанесенные на молекулярное сито, выбранное из группы типов структур, состоящей из 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 и FER и их смесей и/или сростков.
6. Каталитическое изделие по п. 1, в котором второй катализатор СКВ представляет собой неблагородный металл, нанесенный на молекулярное сито, где данный неблагородный металл выбран из группы, состоящей из ванадия (V), молибдена (Мо) и вольфрама (W), хрома (Сr), церия (Се), марганца (Мn), железа (Fе), кобальта (Со), никеля (Ni) и меди (Сu), и их смесей.
7. Каталитическое изделие по п. 1, в котором данный катализатор обеспечивает увеличение выхода N2 из аммиака при температуре от приблизительно 200°С до приблизительно 300°С по сравнению с катализатором, имеющим сравнимый состав, в котором первый катализатор СКВ присутствует в виде первого слоя, а платина присутствует во втором слое, и газ, содержащий NН3 и NО, проходит сквозь первый слой до прохода сквозь второй слой, где данное увеличение выхода N2 составляет, по меньшей мере, 10%.
8. Каталитическое изделие по п. 1, в котором данный катализатор обеспечивает снижение образования N2О из NН3 и NOx при температуре от приблизительно 200°С до приблизительно 350°С по сравнению с катализатором, имеющим сравнимый состав, в котором первый катализатор СКВ присутствует в виде первого слоя, а платина присутствует во втором слое, и газ, содержащий NН3 и NО, проходит сквозь первый слой до прохода сквозь второй слой.
9. Каталитическое изделие по п. 1, в котором данная подложка представляет собой кордиерит, высокопористый кордиерит, металлическую подложку, экструдированные соты или фильтр.
10. Каталитическое изделие по п. 1, в котором второй катализатор СКВ расположен на входной стороне катализатора, содержащего смесь платины на носителе с низким накоплением аммиака и первого катализатора СКВ.
11. Каталитическое изделие по п. 1, в котором второй катализатор СКВ расположен на выходной стороне катализатора, содержащего смесь платины на носителе с низким накоплением аммиака и первого катализаторы СКВ.
12. Каталитическое изделие по п. 11, в котором второй катализатор СКВ содержит промотированный Се-Zr или промотированный МnО2.
13. Каталитическое изделие по любому из пп. 1, 3, 4, 5, 6, 7, 8, 9, 10 и 11, в котором второе покрытие перекрывает, по меньшей мере, 20% длины первого покрытия вдоль оси от входа до выхода.
14. Способ увеличения выхода N2 из аммиака и NOx в выхлопном газе при температуре от приблизительно 200°С до приблизительно 350°С, в котором осуществляют взаимодействие выхлопного газа, содержащего аммиак, с каталитическим изделием по п. 1.
15. Способ очистки выхлопного газа, содержащего аммиак и NOx, в котором осуществляют взаимодействие выхлопного газа, содержащего аммиак, с каталитическим изделием по п. 1.
RU2018101694A 2015-06-18 2016-06-16 Катализатор скв, допускающий передозировку nh3 RU2715539C2 (ru)

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US20180147530A1 (en) 2018-05-31
US20160367937A1 (en) 2016-12-22
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GB2541500A (en) 2017-02-22
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