| Autor: |
Tatsushi Yoshioka, Kenta Iyoki, Yuusuke Hotta, Yoshihiro Kamimura, Hiroki Yamada, Qiao Han, Takeharu Kato, Craig A. J. Fisher, Zhendong Liu, Ryohji Ohnishi, Yutaka Yanaba, Koji Ohara, Yukichi Sasaki, Akira Endo, Takahiko Takewaki, Tsuneji Sano, Tatsuya Okubo, Toru Wakihara |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Science advances. 8(25) |
| ISSN: |
2375-2548 |
| Popis: |
Small-pore zeolites are gaining increasing attention owing to their superior catalytic performance. Despite being critical for the catalytic activity and lifetime, postsynthetic tuning of bulk Si/Al ratios of small-pore zeolites has not been achieved with well-preserved crystallinity because of the limited mass transfer of aluminum species through narrow micropores. Here, we demonstrate a postsynthetic approach to tune the composition of small-pore zeolites using a previously unexplored strategy named pore-opening migration process (POMP). Acid treatment assisted by stabilization of the zeolite framework by organic cations in pores is proven to be successful for the removal of Al species from zeolite via POMP. Furthermore, the dealuminated AFX zeolite is treated via defect healing, which yields superior hydrothermal stability against severe steam conditions. Our findings could facilitate industrial applications of small-pore zeolites via aluminum content control and defect healing and could elucidate the structural reconstruction and arrangement processes for inorganic microporous materials. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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