دورية
Tracking Sub-Nano-Scale Structural Evolution in Zeolite Synthesis by In SituHigh-Energy X-ray Total Scattering Measurement with Pair Distribution Function Analysis
| العنوان: | Tracking Sub-Nano-Scale Structural Evolution in Zeolite Synthesis by In SituHigh-Energy X-ray Total Scattering Measurement with Pair Distribution Function Analysis |
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| المؤلفون: | Minami, Ayano, Hu, Peidong, Sada, Yuki, Yamada, Hiroki, Ohara, Koji, Yonezawa, Yasuo, Sasaki, Yukichi, Yanaba, Yutaka, Takemoto, Masanori, Yoshida, Yuki, Okubo, Tatsuya, Wakihara, Toru |
| المصدر: | Journal of the American Chemical Society; December 2022, Vol. 144 Issue: 51 p23313-23320, 8p |
| مستخلص: | The crystallization mechanism of zeolites remains unclarified to date because of lack of effective techniques in characterizing the local structures of amorphous precursors under synthetic conditions. Herein, in situhigh-energy X-ray total scattering measurement with pair distribution function analysis is performed throughout the hydrothermal synthesis of SSZ-13 zeolite to investigate the amorphous-to-crystalline transformation at the sub-nano level in real time. Ordered four-membered rings (4Rs) are dominantly formed during the induction period, prior to the significant increase in the number of symmetric six- and eight-membered rings (6Rs and 8Rs) in the crystal growth stage. These preformed ordered 4Rs contribute to the formation of d6rand chacomposite building units containing 6Rs and 8Rs with the assistance of the organic structure-directing agent, leading to the construction of embryonic zeolite crystallites, which facilitate the crystal growth through a particle attachment pathway. This work enriches the toolbox for better understanding the crystallization pathway of zeolites. |
| قاعدة البيانات: | Supplemental Index |
Find this issue from the American Chemical Society | تدمد: | 00027863 15205126 |
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| DOI: | 10.1021/jacs.2c05722 |