RU2020120226A - Улучшенное снижение выброса nh3 с большей селективностью в отношении n2 - Google Patents

Улучшенное снижение выброса nh3 с большей селективностью в отношении n2 Download PDF

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RU2020120226A
RU2020120226A RU2020120226A RU2020120226A RU2020120226A RU 2020120226 A RU2020120226 A RU 2020120226A RU 2020120226 A RU2020120226 A RU 2020120226A RU 2020120226 A RU2020120226 A RU 2020120226A RU 2020120226 A RU2020120226 A RU 2020120226A
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catalytic
coating
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Дэвид МИКЭЛЛЕФ
Эндрю НЬЮМАН
Алекс Коннел ПАРСОНС
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Джонсон Мэттей Паблик Лимитед Компани
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Claims (18)

1. Каталитический нейтрализатор, содержащий первое каталитическое покрытие и второе каталитическое покрытие,
причем первое каталитическое покрытие содержит смесь 1) Pt на носителе и 2) молекулярного сита; и
причем второе каталитическое покрытие содержит каталитический нейтрализатор SCR.
2. Каталитический нейтрализатор по п. 1, отличающийся тем, что носитель содержит диоксид кремния, диоксид титана и/или Me-легированный оксид алюминия или диоксид титана, причем Ме содержит металл, выбранный из: W, Mn, Fe, Bi, Ba, La, Ce, Zr или смесей двух или более из них.
3. Каталитический нейтрализатор по п. 1, отличающийся тем, что молекулярное сито содержит FER, BEA, CHA, AEI, MOR, MFI, а также их смеси и сростки.
4. Каталитический нейтрализатор по п. 1, отличающийся тем, что Pt присутствует в количестве от около 1 г/фут3 до около 10 г/фут3 по отношению к массе первого каталитического покрытия.
5. Каталитический нейтрализатор по п. 1, отличающийся тем, что молекулярное сито присутствует в количестве вплоть до около 2 г/дюйм3 по отношению к массе первого каталитического покрытия.
6. Каталитический нейтрализатор по п. 1, отличающийся тем, что первое и второе каталитические покрытия выполнены с возможностью контакта отработавшего газа со вторым каталитическим покрытием перед приведением его в контакт с первым каталитическим покрытием.
7. Каталитический нейтрализатор по п. 1, отличающийся тем, что второе каталитическое покрытие перекрывает первое каталитическое покрытие.
8. Каталитический нейтрализатор по п. 1, отличающийся тем, что первое каталитическое покрытие и второе каталитическое покрытие не перекрываются.
9. Каталитический нейтрализатор по п. 1, отличающийся тем, что первое каталитическое покрытие содержит металл платиновой группы на молекулярном сите.
10. Каталитический нейтрализатор по п. 1, отличающийся тем, что молекулярное сито не содержит замещенный металл.
11. Система очистки выбросов, содержащая:
- дизельный двигатель, выбрасывающий поток отработавших газов, содержащий твердые частицы, NOx и монооксид углерода;
- каталитический нейтрализатор по любому из предшествующих пунктов (SCR/ASC).
12. Система по п. 11, дополнительно содержащая расположенный выше по потоку каталитический нейтрализатор SCR, находящийся выше по потоку от SCR/ASC.
13. Система по п. 11, отличающаяся тем, что расположенный выше по потоку каталитический нейтрализатор SCR тесно связан с SCR/ASC.
14. Способ снижения выбросов из потока отработавших газов, включающий приведение в контакт потока отработавших газов с каталитическим нейтрализатором по п.1.
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