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J Am Chem Soc. 2019 Mar 6;141(9):3772-3776. doi: 10.1021/jacs.8b11734. Epub 2019 Feb 25.

Amino Acid-Assisted Construction of Single-Crystalline Hierarchical Nanozeolites via Oriented-Aggregation and Intraparticle Ripening.

Author information

1
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , 2699 Qianjin Street , Changchun 130012 , P. R. China.
2
School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , P. R. China.
3
Shanghai Key Laboratory of Green Chemistry and Chemical Process, School of Chemistry and Molecular Engineering , East China Normal University , North Zhongshan Road 3663 , Shanghai 200062 , P. R. China.
4
International Center of Future Science, Jilin University , 2699 Qianjin Street , Changchun 130012 , P. R. China.

Abstract

Hierarchical nanozeolites are highly desired for heavy oil conversion because of their fast mass transfer, good site accessibility, and short diffusion length compared with their conventional counterparts. Here, we provide a facile amino acid-assisted strategy to synthesize hierarchical ZSM-5 (MFI) zeolite nanocrystals by two-step crystallization in a concentrated gel system. Strikingly, each virus-like zeolite nanoparticle with abundant interconnected intracrystalline mesopores is a high-quality single crystal that is defect-free as confirmed by electron diffraction and NMR analysis. By utilizing advanced electron microscopy techniques, we have studied the evolution process of single-crystalline hierarchical ZSM-5 nanocrystals that involves oriented aggregation of protozeolitic nanoparticles formed at low temperature followed by intraparticle ripening at high temperature. The as-prepared hierarchical Ni@ZSM-5 catalysts exhibit superior catalytic performance in hydrodeoxygenation of stearic acid and palm oil.

PMID:
30793893
DOI:
10.1021/jacs.8b11734

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