| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 74632 | Microporous and Mesoporous Materials | 2011 | 7 Pages |
The interzeolite conversion method is popularly employed for preparing zeolites. Here, FAU–∗BEA interzeolite conversions were performed in the presence of seed crystals under various synthesis conditions, that is, with and without organic structure-directing agents (OSDAs). We succeeded in synthesizing ∗BEA zeolite from FAU zeolite after hydrothermal treatment for only 2 h at 125 °C in the presence of tetraethylammonium hydroxide (TEAOH) and 33 wt.% seed crystals. Moreover, ∗BEA zeolite synthesis was similarly achieved with benzyltrimethylammonium hydroxide (BTMAOH). We also succeeded in the interzeolite conversion of FAU zeolite into ∗BEA zeolite without OSDAs, which, to our knowledge, is the first such conversion; KOH (∗BEA zeolite yield: ca. 34%) and NaOH were effective as alkali sources. Our results suggest that zeolite formation processes via such interzeolite conversions are more efficient with enhanced crystallization rates, and further, OSDA-free conversions are possible.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► FAU−∗BEA interzeolite conversion was investigated in the presence of seed crystals. ► Highly crystalline and pure ∗BEA zeolites were obtained using BTMAOH instead of TEAOH. ► Interzeolite conversion of FAU zeolite into ∗BEA zeolite without OSDAs also occurred.
