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Article Dans Une Revue ChemNanoMat Année : 2022

Hierarchical TS‐1 Through Ammonium Fluoride Etching

Résumé

The impact of the NH 4 F etching on the textural and catalytic properties of TS-1 was investigated. Two TS-1 with different crystal sizes, i. e. 200 and 100 nm; were achieved, with different textural properties as inferred from nitrogen physisorption isotherms at 77 K, mercury porosimetry, powder X-ray diffraction patterns and transmission electron microscopy. The generation of larger mesopores within the parent samples was observed together with a reduction of the coherent crystal size (CCS) upon NH 4 F etching. The generation of secondary porosity further did not result in an alteration of the Si/Ti ratio, allowing to compare the catalytic outcomes of the samples as a function of the textural properties. It was found that the methyl-phenyl sulfide (MPS) conversion kinetics importantly depend on the textural properties of the catalysts. The initial velocity was found to increase linearly with the reduction of the CCS until reaching a plateau, indicating that diffusion limitation occur up to a CCS of approximately 100 nm. Likewise, mono-and dioxidation product selectivity was governed by diffusion issues.

Domaines

Chimie
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Dates et versions

hal-03771757 , version 1 (07-09-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

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Thilali Akkal, Ahcène Soualah, Sophie Morisset, Julie Rousseau, Nourrdine Chaouati, et al.. Hierarchical TS‐1 Through Ammonium Fluoride Etching. ChemNanoMat, 2022, ⟨10.1002/cnma.202200237⟩. ⟨hal-03771757⟩
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