Circumventing the Direct Textural Characterization of Presumed Hierarchical Zeolites: The Case of Surfactant-Templated USY Zeolites - INSTITUT DE CHIMIE DES MILIEUX ET MATERIAUX DE POITIERS Accéder directement au contenu
Article Dans Une Revue Crystal Growth & Design Année : 2023

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

Résumé

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.
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Dates et versions

hal-04119985 , version 1 (07-06-2023)

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Thibaud Aumond, Iane de Souza, Sophie Morisset, Yannick Pouilloux, Sibele Pergher, et al.. Circumventing the Direct Textural Characterization of Presumed Hierarchical Zeolites: The Case of Surfactant-Templated USY Zeolites. Crystal Growth & Design, 2023, 23 (7), pp.4946-4952. ⟨10.1021/acs.cgd.3c00203⟩. ⟨hal-04119985⟩
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