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Open AccessArticle

Toward Understanding of the Effect of Nucleation Temperature on Porous Structure of Micro-Mesoporous Composite Molecular Sieves and Related Crystallization Mechanism

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College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Funshun 113001, China
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Administration Center of the Yellow River Delta Sustainable Development Institute of Shandong Province, Dongying 257001, China
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School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
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PetroChina Fushun Petrochemical Company, Fushun 113001, China
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(9), 777; https://doi.org/10.3390/catal9090777
Received: 24 August 2019 / Revised: 10 September 2019 / Accepted: 12 September 2019 / Published: 17 September 2019
Although micro-mesoporous composite molecular sieves have received significant attention due to their desirable properties, they still lack systematic studies on their crystallization process to achieve controllable synthesis of composite molecular sieves. In this study, a series of Y/SBA-15 micro-mesoporous composite molecular sieves with different porous structures were synthesized by tuning nucleation temperature, based on epitaxial growth on the outer surface of the Y-type crystal particle. All composite molecular sieves were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). Moreover, the effect of nucleation temperature on the structure of composite molecular sieves was investigated, while the crystallization mechanism was also explored. Furthermore, the performance of the molecular sieves on isomerization of n-pentane was investigated, the results suggested that the isomerization selectivity was positively correlated with regularity degree of the mesoporous porous structure, where the highest isomerization reached 95.81%. This work suggests that nucleation temperature plays a key role in structures of micro-mesoporous composite molecular sieves, providing a solid basis for the further development of functional composite molecular sieves. View Full-Text
Keywords: core-shell structure; composite molecular sieve; nucleation stage; nucleation temperature; growth mechanism; isomerization core-shell structure; composite molecular sieve; nucleation stage; nucleation temperature; growth mechanism; isomerization
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Shi, C.; Liu, J.; Wu, W.; Bian, X.; Chen, P.; Yang, Z.; Lu, C. Toward Understanding of the Effect of Nucleation Temperature on Porous Structure of Micro-Mesoporous Composite Molecular Sieves and Related Crystallization Mechanism. Catalysts 2019, 9, 777.

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