Highly para-selective alkylation of toluene by methyl mercaptan over silylated ZSM-5 zeolite - Archive ouverte HAL
Article Dans Une Revue Journal of Catalysis Année : 2024

Highly para-selective alkylation of toluene by methyl mercaptan over silylated ZSM-5 zeolite

Résumé

Friedel-Crafts alkylation of toluene with methyl mercaptan has been investigated in the presence of H-ZSM-5 and SiO2/H-ZSM-5 catalysts. The silica layers have been built on H-ZSM-5 zeolite by chemical liquid deposition of tetraethyl orthosilicate. The passivation with silica of the external surface of H-ZSM-5 zeolite has been confirmed by FT-IR spectroscopy and mesitylene isomerization, used as a model reaction. All catalysts exhibited notable behavior in the alkylation of toluene to xylenes. Efficiencies higher than 98 % in alkylation for both toluene and methyl mercaptan were obtained at 375 ◦C. In terms of para-selectivity, outstanding performance was revealed by the silylated zeolites. Thus, over 12% SiO2/H-ZSM-5, at 375 ◦C and WHSV = 9.4 gtoluene+CH3SH gcat-1h1, the para-xylene selectivity was close to 100 %. The experimental apparent activation energy for the toluene alkylation with methyl mercaptan catalyzed by H-ZSM-5 was 80 kJ/mol.

Domaines

Chimie
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Dates et versions

hal-04782609 , version 1 (14-11-2024)

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Citer

Abdelilah Bayout, Claudia Cammarano, Izabel Medeiros Costa, Gleb Veryasov, Alexander Sachse, et al.. Highly para-selective alkylation of toluene by methyl mercaptan over silylated ZSM-5 zeolite. Journal of Catalysis, 2024, 440, pp.115828. ⟨10.1016/j.jcat.2024.115828⟩. ⟨hal-04782609⟩
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