Highly para-selective alkylation of toluene by methyl mercaptan over silylated ZSM-5 zeolite - Université de Poitiers
Journal Articles Journal of Catalysis Year : 2024

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

Abstract

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 g cat-1h-1, 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.
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Dates and versions

hal-04778093 , version 1 (12-11-2024)

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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-04778093⟩
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