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Abstract:
A seed-directed approach to synthesizing FeZSM-22 zeolite without organic structure directing agent (OSDA) was developed by using Fe-rich diatomite as all aluminum and iron sources. The FeZSM-22 zeolite with optimal crystallinity and purity can be obtained by systematically adjusting feed composition and synthesis conditions. Characterizations show that FeZSM-22 zeolite synthesized with OSDA-free owns high crystallinity, obvious thin needle-shaped morphology and high Bronsted/Lewis acid ratio. Significantly, when used for n-octane hydroisomerization reaction, its derived catalyst exhibits the best catalytic performance reflected by the highest selectivity to C8 isomers compared to the two reference catalysts prepared based on a Fe-containing and a Fe-free ZSM-22 synthesized through an OSDA-directed route from natural diatomite and conventional chemicals, respectively. This work provides an alternative route to sustainably synthesizing heteroatomic zeolites with high performance. © 2023 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd
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Chinese Journal of Chemical Engineering
ISSN: 1004-9541
Year: 2024
Volume: 66
Page: 51-59
3 . 7 0 0
JCR@2023
CAS Journal Grade:3
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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