RU2014122106A - Каталитический фильтр для обработки выхлопного газа - Google Patents

Каталитический фильтр для обработки выхлопного газа Download PDF

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RU2014122106A
RU2014122106A RU2014122106/04A RU2014122106A RU2014122106A RU 2014122106 A RU2014122106 A RU 2014122106A RU 2014122106/04 A RU2014122106/04 A RU 2014122106/04A RU 2014122106 A RU2014122106 A RU 2014122106A RU 2014122106 A RU2014122106 A RU 2014122106A
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crystals
filter
microns
porous substrate
filter product
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RU2014122106/04A
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RU2649005C2 (ru
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Пол Ричард ФИЛЛИПС
Гай Ричард ЧЭНДЛЕР
Кит Энтони ФЛЭНЭГАН
Александр Николас Майкл ГРИН
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Джонсон Мэтти Паблик Лимитед Компани
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
    • B01J29/76—Iron group metals or copper
    • B01J29/763—CHA-type, e.g. Chabazite, LZ-218
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    • 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
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    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
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    • B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
    • B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
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    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
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Abstract

1. Фильтрующее изделие, содержащее:(а) непассивированный керамический фильтр с проточными стенками, содержащий пористую подложку, имеющею входную и выходную стороны; и(b) SСR каталитическую композицию, нанесенную на, по меньшей мере, одно из следующих мест: входную сторону пористой подложки, выходную сторону пористой подложки и между упомянутыми входной и выходной сторонами, где данная каталитическая композиция содержит кристаллы молекулярного сита, промотированного переходным металлом, и где:i. упомянутые кристаллы имеют средний кристаллический размер от приблизительно 0,5 до приблизительно 15 мкм,ii. упомянутые кристаллы присутствуют в упомянутой композиции в виде индивидуальных кристаллов, агломераций, имеющих средний размер частиц меньше чем приблизительно 15 мкм, или комбинаций упомянутых индивидуальных кристаллов и упомянутых агломераций;iii. упомянутые кристаллы представляют собой алюмосиликат или силикоалюмофосфат со структурным типом, имеющим максимальный размер колец восемь тетраэдрических атомов; иiv. упомянутая SСR каталитическая композиция, по существу, свободна от карбоновых кислот.2. Фильтрующее изделие по п. 1, в котором упомянутые кристаллы имеют структурный тип СНА, АЕI, АFТ или АFХ, и упомянутый переходный металл выбирают из, по меньшей мере,одного из Сu и Fе.3. Фильтрующее изделие по п. 2, в котором указанные кристаллы представляют собой алюмосиликат и имеют отношение оксида кремния к оксиду алюминия от приблизительно 15 до приблизительно 50.4. Фильтрующее изделие по п. 1, в котором средний размер кристаллов составляет от приблизительно 1,5 мкм до приблизительно 5 мкм.5. Фильтрующее изделие по п. 1, в кот

Claims (10)

1. Фильтрующее изделие, содержащее:
(а) непассивированный керамический фильтр с проточными стенками, содержащий пористую подложку, имеющею входную и выходную стороны; и
(b) SСR каталитическую композицию, нанесенную на, по меньшей мере, одно из следующих мест: входную сторону пористой подложки, выходную сторону пористой подложки и между упомянутыми входной и выходной сторонами, где данная каталитическая композиция содержит кристаллы молекулярного сита, промотированного переходным металлом, и где:
i. упомянутые кристаллы имеют средний кристаллический размер от приблизительно 0,5 до приблизительно 15 мкм,
ii. упомянутые кристаллы присутствуют в упомянутой композиции в виде индивидуальных кристаллов, агломераций, имеющих средний размер частиц меньше чем приблизительно 15 мкм, или комбинаций упомянутых индивидуальных кристаллов и упомянутых агломераций;
iii. упомянутые кристаллы представляют собой алюмосиликат или силикоалюмофосфат со структурным типом, имеющим максимальный размер колец восемь тетраэдрических атомов; и
iv. упомянутая SСR каталитическая композиция, по существу, свободна от карбоновых кислот.
2. Фильтрующее изделие по п. 1, в котором упомянутые кристаллы имеют структурный тип СНА, АЕI, АFТ или АFХ, и упомянутый переходный металл выбирают из, по меньшей мере,
одного из Сu и Fе.
3. Фильтрующее изделие по п. 2, в котором указанные кристаллы представляют собой алюмосиликат и имеют отношение оксида кремния к оксиду алюминия от приблизительно 15 до приблизительно 50.
4. Фильтрующее изделие по п. 1, в котором средний размер кристаллов составляет от приблизительно 1,5 мкм до приблизительно 5 мкм.
5. Фильтрующее изделие по п. 1, в котором пористое покрытие нанесено непосредственно на пористую подложку без промежуточного некаталитического покрытия.
6. Фильтрующее изделие по п. 1, в котором указанная пористая подложка имеет некоторый средний размер пор, и где отношение среднего размера пор к среднему размеру кристаллов составляет от приблизительно 3:1 до приблизительно 20:1
7. Фильтрующее изделие по п. 1, в котором керамический монолит с проточными стенками содержит субмикронные швы теплового расширения, которые свободны от катализатора.
8. Фильтрующее изделие по п. 7, где данное фильтрующее изделие не подвергали тепловой обработке при температуре выше 350°С, чтобы удалить или карбонизовать пассивирующий слой.
9. Фильтрующее изделие по п. 1, в котором упомянутая пористая подложка представляет собой керамический монолит с проточными стенками, содержащий титанат алюминия в качестве преобладающей кристаллической фазы.
10. Система для обработки выхлопного газа, содержащая:
а. непассивированный каталитический фильтр с проточными стенками, содержащий
i. пористую подложку, имеющую входную и выходную стороны; и
ii. SСR каталитическую композицию, нанесенную на, по меньшей мере, одно из следующих мест: входную сторону пористой подложки, выходную сторону пористой подложки и между упомянутыми входной и выходной сторонами, где данная каталитическая композиция содержит кристаллы молекулярного сита, промотированного переходным металлом, где: упомянутые кристаллы имеют средний кристаллический размер от приблизительно 0,5 мкм до приблизительно 15 мкм, упомянутые кристаллы присутствуют в упомянутой композиции в виде индивидуальных кристаллов, агломераций, имеющих средний размер частиц меньше чем приблизительно 15 мкм, или комбинации упомянутых индивидуальных кристаллов и упомянутых агломераций, и
упомянутое молекулярное сито представляет собой алюмосиликат или силикоалюмофосфат со структурным типом, имеющим максимальный размер колец восемь тетраэдрических атомов,
b. трубопровод, соединяющий данный фильтр с проточными стенками и источник выхлопного газа бедной смеси, содержащего мелкие частицы и NОх, и
с. систему подачи восстановителя для ввода восстановителя в выхлопной газ сгорания бедной смеси, где данная система подачи восстановителя находится в проточном сообщении с каталитическим фильтром с проточными стенками и расположена выше по ходу от каталитического фильтра с проточными стенками в отношении потока газа сквозь фильтр.
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