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Article Dans Une Revue Microporous and Mesoporous Materials Année : 2023

Optimization of ammonium fluoride route to hierarchical ZSM-5 zeolites

Résumé

Preparation of hierarchical zeolites via a chemical etching is a hot topic as it strongly improves microporous material's diffusive properties and thus their catalytic activity. However, an issue that is often neglected is the softening the post-treatment condition. Herein we we report the optimization of NH4F etching, using less concentrated solutions and milder treatment conditions. Following characterization by ICP-AES, XRD, 27 Al MAS NMR, TEM, and N2 physisorption, it has been shown that it is possible to soften the post-treatment conditions by playing with three synthesis parameters: (1) Decreasing the NH4F/ZSM-5 wt/wt ratio allows the generation of mesopores of different diameter (from 27 to 55 nm); (2) Decreasing the etching time provides precise control over the textural properties of the hierarchical ZSM-5; (3) Decreasing the initial NH4F weight concentration also allows to tune the pore diameter from large (55 nm) to a small mesopore (5 nm).

Domaines

Matériaux
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Dates et versions

hal-04229106 , version 1 (05-10-2023)

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T. Onfroy, Z. Qin, S. Casale, V. Valtchev. Optimization of ammonium fluoride route to hierarchical ZSM-5 zeolites. Microporous and Mesoporous Materials, 2023, 362, pp.112760. ⟨10.1016/j.micromeso.2023.112760⟩. ⟨hal-04229106⟩
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