Mesopores in USY Zeolites |
| |
| Authors: | Dr Wolfgang Lutz Dirk Enke Wolf‐Dieter Einicke Dirk Täschner Rolf Kurzhals |
| |
| Institution: | 1. Lehrstuhl für Luftchemie und Luftreinhaltung, Brandenburgische Technische Universit?t Cottbus, Labor Berlin, Volmerstr. 13, 12489 Berlin, Germany;2. Institut für Technische Chemie, Fakult?t für Chemie und Mineralogie, Universit?t Leipzig, Leipzig, Linnéstr. 3–4, 04103 Leipzig, Germany;3. Süd‐Chemie Zeolites GmbH, Tricat‐Str., 06803 Bitterfeld‐Wolfen, Germany |
| |
| Abstract: | Zeolites of type NaY synthesised by use of seed‐solution and zeolite X‐seeds to initialise the crystallisation were compared. A different homogeneity of the internal framework structure related to the Si/Al ratio was expected. Thus, the formation of closed bulk mesopores should be influenced during treatment of NH4NaY modification for 7 hours at 450 °C and 600 °C, respectively, in the water steam of 1 bar. Occurrence of different mesopores was actually observed in obtained ultra‐stable USY zeolites using nitrogen adsorption. Whereas USY prepared by use of seed‐solution contains only open mesopores at the crystal surface, the X‐seed synthesised material contains open and closed mesopores at the surface and in the nuclei of samples, respectively. |
| |
| Keywords: | Zeolites Silicon Aluminum Dealumination Faujasite Mesopores |
|
|
