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RU2018143245A - Катализатор обработки проскочившего аммиака - Google Patents

Катализатор обработки проскочившего аммиака Download PDF

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Publication number
RU2018143245A
RU2018143245A RU2018143245A RU2018143245A RU2018143245A RU 2018143245 A RU2018143245 A RU 2018143245A RU 2018143245 A RU2018143245 A RU 2018143245A RU 2018143245 A RU2018143245 A RU 2018143245A RU 2018143245 A RU2018143245 A RU 2018143245A
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Russia
Prior art keywords
catalyst
catalyst layer
substrate
oxidation
supported
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RU2018143245A
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English (en)
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RU2018143245A3 (ru
Inventor
Джозеф Майкл ФЕДЕЙКО
Кевин ДОУРА
Эрих Конлан ВАЙГЕРТ
Джулиан Питер КОКС
Хай-Ин ЧЭНЬ
Пол Джозеф АНДЕРСЕН
Original Assignee
Джонсон Мэтти Паблик Лимитед Компани
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Publication of RU2018143245A publication Critical patent/RU2018143245A/ru
Publication of RU2018143245A3 publication Critical patent/RU2018143245A3/ru

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Claims (26)

1. Система для обработки выхлопного газа, включающая
a. коллектор выхлопного газа;
b. подсистему для введения азотсодержащего восстановителя в выхлопной газ;
c. катализатор SCR; и
d. подложку, содержащую первый слой катализатора, размещенный на и/или внутри подложки, и второй слой катализатора, нанесенный поверх первого слоя катализатора; в котором первый слой катализатора содержит первый катализатор окисления, причем данный первый катализатор окисления представляет собой палладий на носителе, а второй слой катализатора содержит смесь (i) второго катализатора окисления, состоящего из палладия на носителе, и (ii) катализатора селективного восстановления NOX и/или накопления NH3, причем данный катализатор селективного восстановления NOX и/или накопления NH3 представляет собой цеолит, на который загрузили Fe и/или Cu; и в котором первый и второй катализаторы окисления представляют собой различные составы;
где компоненты (a)-(d) последовательно соединены по текучей среде и расположены, соответственно, в последовательном порядке по направлению потока; и где система не содержит катализаторы окисления между подложкой и коллектором выхлопного газа.
2. Система для обработки выхлопного газа, включающая
a. первый катализатор окисления для получения отношения NO/NO2, составляющего от приблизительно 4:1 до приблизительно 1:3;
b. подсистему для введения азотсодержащего восстановителя в выхлопной газ;
c. катализатор SCR;
d. инжектор для введения топлива в выхлопной газ;
e. подложку в виде проточного монолита, содержащую первый слой катализатора, размещенный на и/или внутри подложки, и второй слой катализатора, нанесенный поверх, по меньшей мере, части первого слоя катализатора, где второй слой катализатора содержит смесь (i) второго катализатора окисления, состоящего из палладия на первом носителе, и (ii) катализатора селективного восстановления NOX и/или накопления NH3, причем данный катализатор селективного восстановления NOX и/или накопления NH3 представляет собой цеолит, на который загрузили Fe и/или Cu; а первый слой катализатора содержит третий катализатор окисления, где данный третий катализатор окисления содержит благородный металл на носителе; где подложка соединена по текучей среде с коллектором выхлопного газа; и
f. фильтр твердых частиц выхлопа дизельных двигателей;
в которой компоненты (a)-(e) расположены, соответственно, в последовательном порядке по направлению потока.
3. Система по п. 1, в которой второй слой катализатора практически не содержит Ag, Au, Pt, Rh, Ru, Ir и Os.
4. Система по п. 1, в которой первый катализатор окисления представляет собой Pt, нанесенную на частицы оксида металла, или смесь Pt и Pd, нанесенную на частицы оксида металла.
5. Система по п. 1, в которой подложка представляет собой проточный сотовый блок, имеющий пористость стенок приблизительно 50-65%.
6. Система по п. 5, в которой большая часть первого слоя катализатора размещена внутри стенок подложки, а большая часть второго слоя катализатора размещена на поверхности стенок подложки.
7. Система по п. 1, в которой подложка дополнительно содержит третий слой катализатора, нанесенный поверх второго слоя катализатора, где третий слой катализатора содержит третий катализатор окисления, состоящий из Pd на носителе.
8. Система по п. 1, в которой подложка дополнительно содержит третий слой катализатора, размещенный выше по потоку относительно первого и второго слоев катализатора, где третий слой катализатора содержит третий катализатор окисления, состоящий из Pd на носителе.
9. Система по п. 2, в которой второй слой катализатора практически не содержит Ag, Au, Pt, Rh, Ru, Ir и Os.
10. Система по п. 2, в которой второй катализатор окисления представляет собой Pt, нанесенную на частицы оксида металла, или смесь Pt и Pd, нанесенную на частицы оксида металла.
11. Система по п. 2, в которой подложка представляет собой проточный сотовый блок, имеющий пористость стенок приблизительно 50-65%.
12. Система по п. 2, в которой большая часть первого слоя катализатора размещена внутри стенок подложки, а большая часть второго слоя катализатора размещена на поверхности стенок подложки.
13. Система по п. 2, в которой подложка дополнительно содержит третий слой катализатора, нанесенный поверх второго слоя катализатора, где третий слой катализатора содержит четвертый катализатор окисления, состоящий из Pd на носителе.
14. Система по п. 2, в которой подложка дополнительно содержит третий слой катализатора, размещенный выше по потоку относительно первого и второго слоев катализатора, где третий слой катализатора содержит четвертый катализатор окисления, состоящий из Pd на носителе.
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