Circumventing the Direct Textural Characterization of Presumed Hierarchical Zeolites: The Case of Surfactant-Templated USY Zeolites

The presence of intracrystalline mesopores in hierarchical zeolites is often difficult to prove with standard and even advanced characterization techniques. Zeolite-templated carbons (ZTCs) develop within the zeolite microporosity and are hence a negative copy of their porous structure. Textural cha...

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Bibliographic Details
Published in:Crystal growth & design 2023-07, Vol.23 (7), p.4946-4952
Main Authors: Aumond, Thibaud, De Souza, Iane M. S., Morisset, Sophie, Pouilloux, Yannick, Pergher, Sibele B. C., Sachse, Alexander
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:The presence of intracrystalline mesopores in hierarchical zeolites is often difficult to prove with standard and even advanced characterization techniques. Zeolite-templated carbons (ZTCs) develop within the zeolite microporosity and are hence a negative copy of their porous structure. Textural characterization of the ZTCs allows for circumventing the difficulty in assessing the presence of intracrystalline mesoporosity in the presumed hierarchical zeolite. A set of surfactant-templated USY zeolites was prepared using surfactants with increasing chain lengths, and the corresponding ZTCs were synthesized. The textural characterization of the hybrid materials (zeolite/ZTC) and of the ZTCs (after zeolite dissolution) achieved from surfactant-templated zeolites allowed us to conclude the absence of intracrystalline tailored mesoporosity. Zeolites achieved upon surfactant-templating should hence rather be described as composite materials. The difficulty in assessing the composite nature of these surfactant-templated zeolites is due to the formation of the tailored mesoporosity within the larger (steamed) mesoporosity of the parent zeolite.
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.3c00203