RU2016138284A - Катализаторы scr с улучшенной низкотемпературной эффективностью и способы их создания и использования - Google Patents

Катализаторы scr с улучшенной низкотемпературной эффективностью и способы их создания и использования Download PDF

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RU2016138284A
RU2016138284A RU2016138284A RU2016138284A RU2016138284A RU 2016138284 A RU2016138284 A RU 2016138284A RU 2016138284 A RU2016138284 A RU 2016138284A RU 2016138284 A RU2016138284 A RU 2016138284A RU 2016138284 A RU2016138284 A RU 2016138284A
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molecular sieve
iron
temperature
hours
hydrothermal
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RU2016138284A
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RU2016138284A3 (ru
RU2702988C2 (ru
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Гай Ричард ЧЭНДЛЕР
Джиллиан Элэйн КОЛЛИЕР
Александр Николас Майкл ГРИН
Дезире ДЮРАН-МАРТИН
Пол Ричард ФИЛЛИПС
Радж Рао РАДЖАРАМ
Стюарт Дэвид РИД
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Джонсон Мэтти Паблик Лимитед Компани
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Claims (22)

1. Способ изготовления SCR-активного катализатора на основе молекулярного сита, включающий выполнение гидротермической обработки содержащего железо молекулярного сита в неокисляющей атмосфере или термическую обработку содержащего железо молекулярного сита в восстановительной атмосфере при температуре в диапазоне от 600°C до 900°C в течение от 5 минут до двух часов.
2. Способ по п. 1, в котором гидротермическая или термическая обработка выполняется при температуре в диапазоне от 650°C до 850°C в течение от 15 минут до двух часов.
3. Способ по п. 1, в котором цеолит представляет собой ZSM-5, а гидротермическая или термическая обработка выполняется при температуре в диапазоне от приблизительно 600°C до приблизительно 800°C в течение от 15 минут до двух часов.
4. Способ по п. 1, в котором цеолит представляет собой ферриерит, и гидротермическая обработка выполняется при температуре в диапазоне от приблизительно 700°C до приблизительно 900°C в течение от 15 минут до двух часов.
5. SCR-активное содержащее железо молекулярное сито, прошедшее гидротермическую обработку в содержащей пар неокисляющей атмосфере или термическую обработку в восстановительной атмосфере при температуре в диапазоне от 600°C до 900°C в течение от 5 минут до двух часов, где данное молекулярное сито показывает такое селективное каталитическое восстановление оксидов азота с аммиаком NH3 или мочевиной при температуре 250°C, которое по меньшей мере на 50% больше, чем для сопоставимого содержащего железо молекулярного сита, которое было прокалено при температуре 500°C в течение двух часов без выполнения гидротермической обработки в неокисляющей атмосфере или термической обработки в восстановительной атмосфере.
6. SCR-активное содержащее железо молекулярное сито по п. 5, которое представляет собой BEA, MFI, FER, CHA, AFX, AEI, SFW, SAPO-34, SAPO-56, SAPO-18 или SAV SAPO STA-7.
7. SCR-активный содержащий железо ферриерит, имеющий мессбауэровский спектр, содержащий три дублета, имеющие изомерный сдвиг (CS) и квадрупольное расщепление (QS):
(a) CS=0,35 мм/с и QS=1,09 мм/с;
(b) CS=0,44 мм/с и QS=2,18 мм/с, и
(c) CS=1,2 мм/с и QS=2,05 мм/с,
где значения для CS и QS составляют ±0,02 мм/с.
8. Способ по п. 1, дополнительно включающий, после выполнения гидротермической или термической обработки содержащего железо молекулярного сита в неокисляющей атмосфере, введение кислорода в неокисляющую атмосферу в продолжение по меньшей мере части того времени, когда содержащее железо молекулярное сито охлаждается от температуры гидротермической или термической обработки до температуры окружающей среды.
9. Способ по п. 1, в котором содержащее железо молекулярное сито, подвергаемое гидротермической или термической обработке, находится в виде порошка.
10. Способ по п. 1, в котором содержащее железо молекулярное сито, подвергаемое гидротермической или термической обработке, находится в виде экструдированного не нанесенного катализатора или покрытия на носителе.
11. Способ по п. 1, в котором содержащее железо молекулярное сито готовят путем контактирования молекулярного сита с солью железа.
12. SCR-активное содержащее железо молекулярное сито, прошедшее гидротермическую обработку в содержащей пар неокисляющей атмосфере или термическую обработку в восстановительной атмосфере при температуре в диапазоне от 600°C до 900°C в течение от 5 минут до двух часов, где данное молекулярное сито показывает такое селективное каталитическое восстановление оксидов азота с аммиаком NH3 или мочевиной при температуре 250°C, которое по меньшей мере на 50% больше, чем для сопоставимого содержащего железо молекулярного сита, которое было прокалено при температуре 500°C в течение двух часов без выполнения гидротермической обработки в неокисляющей атмосфере или термической обработки в восстановительной газовой среде.
13. SCR-активный содержащий железо ферриерит, имеющий мессбауэровский спектр, содержащий три дублета, имеющие изомерный сдвиг (CS) и квадрупольное расщепление (QS):
(a) CS=0,35 мм/с и QS=1,09 мм/с;
(b) CS=0,44 мм/с и QS=2,18 мм/с, и
(c) CS=1,2 мм/с и QS=2,05 мм/с,
где значения для CS и QS составляют ±0,02 мм/с.
14. SCR-активное содержащее железо молекулярное сито, прошедшее гидротермическую обработку в содержащей пар неокисляющей атмосфере или термическую обработку в восстановительной атмосфере при температуре в диапазоне от 600°C до 900°C в течение от 5 минут до двух часов, которое показывает такое селективное каталитическое восстановление оксидов азота с аммиаком NH3 или мочевиной при температуре 250°C, где данное молекулярное сито по меньшей мере на 50% больше, чем для сопоставимого содержащего железо молекулярного сита, которое было прокалено при температуре 500°C в течение двух часов без выполнения гидротермической обработки в неокисляющей атмосфере или термической обработки в восстановительной газовой среде.
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