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Article

Spherical Binderless 4A/5A Zeolite Assemblies: Synthesis, Characterization, and Adsorbent Applications

by
Tong Li
1,†,
Shuangwei Wang
2,†,
Jinqiang Gao
1,
Ruiqiang Wang
2,
Guifeng Gao
2,
Guangming Ren
2,
Shengnan Na
3,
Mei Hong
1,* and
Shihe Yang
1,*
1
Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Advanced Materials, Peking University Shenzhen Graduate School (PKUSZ), Shenzhen 518055, China
2
Ambulanc (Shenzhen) Tech. Co., Ltd., Shenzhen 518108, China
3
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Molecules 2024, 29(7), 1432; https://doi.org/10.3390/molecules29071432
Submission received: 24 January 2024 / Revised: 14 March 2024 / Accepted: 14 March 2024 / Published: 22 March 2024
(This article belongs to the Special Issue Porous Materials: Synthetic Strategies and Applications)
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Abstract

Zeolite microspheres have been successfully applied in commercial-scale separators such as oxygen concentrators. However, further enhancement of their applications is hampered by the post-synthetic shaping process that formulates the zeolite powder into packing-sized spherical bodies with various binders leading to active site blockage and suboptimal performance. Herein, binderless zeolite microspheres with a tunable broad size range from 2 µm to 500 µm have been developed with high crystallinity, sphericity over 92%, monodispersity with a coefficient of variation (CV) less than 5%, and hierarchical pore architecture. Combining precursor impregnation and steam-assisted crystallization (SAC), mesoporous silica microspheres with a wide size range could be successfully transformed into zeolite. For preserved size and spherical morphology, a judicious selection of the synthesis conditions is crucial to ensure a pure phase, high crystallinity, and hierarchical architecture. For the sub-2-µm zeolite microsphere, low-temperature prolonged aging was important so as to suppress external zeolization that led to a large, single macroporous crystal. For the large 500 µm sphere, ultrasound pretreatment and vacuum impregnation were crucial and facilitated spatially uniform gel matrix dispersion and homogenous crystallization. The obtained zeolite 5A microspheres exhibited excellent air separation performance, while the 4A microspheres displayed ammonium removal capabilities. This work provides a general strategy to overcome the existing limitations in fabricating binder-free technical bodies of zeolites for various applications.
Keywords: zeolite; microsphere; aging; impregnation; air separation zeolite; microsphere; aging; impregnation; air separation
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MDPI and ACS Style

Li, T.; Wang, S.; Gao, J.; Wang, R.; Gao, G.; Ren, G.; Na, S.; Hong, M.; Yang, S. Spherical Binderless 4A/5A Zeolite Assemblies: Synthesis, Characterization, and Adsorbent Applications. Molecules 2024, 29, 1432. https://doi.org/10.3390/molecules29071432

AMA Style

Li T, Wang S, Gao J, Wang R, Gao G, Ren G, Na S, Hong M, Yang S. Spherical Binderless 4A/5A Zeolite Assemblies: Synthesis, Characterization, and Adsorbent Applications. Molecules. 2024; 29(7):1432. https://doi.org/10.3390/molecules29071432

Chicago/Turabian Style

Li, Tong, Shuangwei Wang, Jinqiang Gao, Ruiqiang Wang, Guifeng Gao, Guangming Ren, Shengnan Na, Mei Hong, and Shihe Yang. 2024. "Spherical Binderless 4A/5A Zeolite Assemblies: Synthesis, Characterization, and Adsorbent Applications" Molecules 29, no. 7: 1432. https://doi.org/10.3390/molecules29071432

APA Style

Li, T., Wang, S., Gao, J., Wang, R., Gao, G., Ren, G., Na, S., Hong, M., & Yang, S. (2024). Spherical Binderless 4A/5A Zeolite Assemblies: Synthesis, Characterization, and Adsorbent Applications. Molecules, 29(7), 1432. https://doi.org/10.3390/molecules29071432

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