Cu/zeolite SCR catalyst for NOx reduction in exhaust gases and manufacture method thereof
Патенты
Язык: |
Английский |
Тип: |
Патент на изобретение |
Номер (11) |
EP 2308596 B1 |
Номер заявки (21): |
09172402.1 |
Дата подачи заявки (22): |
7 окт. 2009 г. |
Дата начала отсчета срока действия патента (24): |
|
Дата публикации патента (44,45,46): |
21 сент. 2016 г. |
Дата публикации заявки (43): |
13 апр. 2011 г. |
Авторы |
Ukropec R.
,
Chigapov A.N.
,
Dubkov A.A.
,
Balenovic M.
,
Reichert M.
,
Carberry B.P.
|
Организации |
1 |
Ford Global Technologies, LLC Dearborn, MI 48126 (US)
|
|
The present invention describes a method of preparation and/or modification of Cu/zeolite catalysts designed for the SCR of nitrogen oxides with ammonia, including commercial catalysts. The method is comprising a removal of extra-lattice (extra-framework) aluminum species together with copper ions using citrate solution and a following re-insertion of copper or insertion of Cu/M ions, where M = Mg, Ca, Sr, La, Pr, B, Zr or Mg-Fe or Mg-Ce, using ion-exchange and/ or impregnation. The modified catalyst has improved and high NOx reduction properties at temperatures 170-600°C and excellent hydrothermal stability up to 900°C.