Influence of seeding on FAU–∗BEA interzeolite conversions
Influence of seeding on FAU–∗BEA interzeolite conversions
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DOI：
10.1016/j.micromeso.2010.11.031
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发表时间：
2011-06
影响因子：
5.2
通讯作者：
Koutaro Honda;A. Yashiki;Masaya Itakura;Y. Ide;M. Sadakane;T. Sano
中科院分区：
文献类型：
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作者：
Koutaro Honda;A. Yashiki;Masaya Itakura;Y. Ide;M. Sadakane;T. Sano
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 2h at 125°C in the presence of tetraethylammonium hydroxide (TEAOH) and 33wt.% 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.
