Cu/zeolite SCR catalyst for NOx reduction in exhaust gases and manufacture method thereof
Patents
| Language: |
Английский |
| Type: |
Invention |
| Number |
EP 2308596 B1 |
| Request number: |
09172402.1 |
| Request date: |
Oct 7, 2009 |
| patent.field.start_date: |
|
| Registration date: |
Sep 21, 2016 |
| patent.field.request_publication_date: |
Apr 13, 2011 |
| Authors |
Ukropec R.
,
Chigapov A.N.
,
Dubkov A.A.
,
Balenovic M.
,
Reichert M.
,
Carberry B.P.
|
| Affiliations |
| 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.