NDLI: Al-ZSM-5 Nanocrystal Catalysts Grown from Silicalite-1 Seeds for Methane Conversion

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Al-ZSM-5 Nanocrystal Catalysts Grown from Silicalite-1 Seeds for Methane Conversion

Content Provider	MDPI
Author	Kim, Hyun Su Kang, Su Kyung Zhang, Haoxiang Tikue, Elsa Tsegay Lee, Jin Hyung Lee, Pyung Soo
Copyright Year	2021
Description	This study evaluated Al-ZSM-5 nanocrystals grown from silicalite-1 seed crystals as catalysts for the methane dehydroaromatization (MDA) reaction. Silicalite-1 seed crystals sized between 30 and 40 nm were used to grow Al-ZSM-5 under various synthesis conditions. The size of Al-ZSM-5 was significantly affected by the Si/Al ratio (SAR), synthesis time, and silica nutrients/seed crystal ratio (NSR). Larger crystals were obtained with an increased SAR in the synthesis sols. Gradual growth of Al-ZSM-5 occurred with synthesis time, although the growth in crystal size ceased at 5 h of synthesis at 120 °C, indicating the rapid growth of Al-ZSM-5 aided by the silicalite-1 seeds. Precise tuning of Al-ZSM-5 size was possible by changing the nutrient/silicalite-1 seed ratio; a higher NSR led to larger crystals. Two representative Al-ZSM-5 crystals with SARs of 35 and 140 were prepared for catalyst testing, and the crystal sizes were tailored to <100 nm by controlling NSR. The MDA reaction was conducted in the presence of the prepared Al-ZSM-5. The catalyst size exhibited distinct differences in catalyst stability, while the SAR of catalysts did not produce noticeable changes in the catalyst stability of the Al-ZSM-5 crystals and commercial zeolites in this reaction system.
Starting Page	485
e-ISSN	19961073
DOI	10.3390/en14020485
Journal	Energies
Issue Number	2
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-01-18
Access Restriction	Open
Subject Keyword	Energies Crystallography Silicalite-1 Al-zsm-5 Zeolites Methane Dehydroaromatization Diffusion Nanocrystal
Content Type	Text
Resource Type	Article

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