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Article Dans Une Revue ACS Sustainable Chemistry & Engineering Année : 2022

Passivated surface of high aluminum containing ZSM-5 by silicalite-1: synthesis and application in dehydration reaction

Résumé

Methanol dehydration reaction is an essential process to bridge the biomass conversion and chemicals. However, the undesired distribution of zeolite acidity hinders its excellent catalytic performance. In this work, the technique of passivating surface acidity of a high aluminum containing ZSM-5 zeolite by the growth of Silicalite-1 layer under hydrothermal conditions is presented. The samples passivated with a single-step or double-step of Silicalite-1 deposition were tested for the dehydration of methanol to dimethyl ether and compared to the parent ZSM-5 zeolite using a bench-scale packed bed reactor operated at 160-240°C under atmospheric pressure. The conversion and selectivity for the single-step Silicalite-1 deposition catalyst decreased, and the amount of coke increased with respect to the parent ZSM5 catalyst. The formation of an amorphous silica layer and the decrease of the active surface caused the drop in conversion and selectivity of the catalyst with the passivating single-step Silicalite-1 deposition with respect to the parent zeolite. In contrast, the double-step of Silicalite-1 deposition on the catalyst showed similar conversion to the parent ZSM-5 zeolite but an improved selectivity due to the low coke formation and retention in the highly porous structure.

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Chimie
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Dates et versions

hal-04295831 , version 1 (20-11-2023)

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Girolamo Giordano, Massimo Migliori, Giorgia Ferrarelli, Gianfranco Giorgianni, Francesco Dalena, et al.. Passivated surface of high aluminum containing ZSM-5 by silicalite-1: synthesis and application in dehydration reaction. ACS Sustainable Chemistry & Engineering, 2022, 10 (15), pp.4839-4848. ⟨10.1021/acssuschemeng.1c07198⟩. ⟨hal-04295831⟩
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