Abstract
Develo** efficient and stable zeolites for vapor-phase Beckmann rearrangement of cyclohexanone oxime is still a great challenge to realize ε-caprolactam (CPL) green production. In this work, the hierarchical porous silicalite-1 zeolites with multiple hollow structure (S-1-M) are explored by in-situ desilication—recrystallization post-treatment of spongy highway-like zeolites (S-1-S), which are synthesized through silanization synthesis of conventional bulky silicalite-1 (S-1). Compared to S-1, S-1-M achieves superior catalytic performance, with improving the CPL selectivity from 85.7% to 94.1% and prolonging the catalyst lifetime from 74 to 126 h at a weight hourly space velocity (WHSV) of 6 h−1. Comprehensive physiochemical studies demonstrate that the highly dispersed intracrystalline cavities within S-1-M endow greater mass diffusion and better quasi acidity inducing by the enhanced H-bonds among abundant H-bonded silanols, which is cooperatively responsible for its superior catalytic performance.
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Acknowledgements
This work was supported by the National Key Basic Research Development Plan “973” Project (No. 2006CB202508), the National Key R&D Program of China (No. 2021YFA1502600), State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC) (No. 33600000-20-ZC0607-0024), the SINOPEC Project (Nos. 411058 and 413025), and the National Natural Science Foundation (Nos. 21808244, 22178347, and 22072182).
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Rational construction of multiple hollow silicalite-1 zeolite with enhanced quasi acidity for robust vapor-phase Beckmann rearrangement
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Zhang, P., Yi, X., **a, C. et al. Rational construction of multiple hollow silicalite-1 zeolite with enhanced quasi acidity for robust vapor-phase Beckmann rearrangement. Nano Res. 16, 7958–7966 (2023). https://doi.org/10.1007/s12274-022-5305-3
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DOI: https://doi.org/10.1007/s12274-022-5305-3