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

被引：0

作者：

Bayout, Abdelilah ^{[1
]}

Cammarano, Claudia ^{[1
]}

Costa, Izabel Medeiros ^{[2
]}

Veryasov, Gleb ^{[3
]}

Sachse, Alexander ^{[4
]}

Hulea, Vasile ^{[1
]}

机构：

[1] Univ Montpellier, Charles Gerhardt Inst Montpellier, CNRS, ENSCM, 1919 Rte Mende, F-34293 Montpellier 5, France

[2] TotalEnergies One Tech, Courbevoie, France

[3] Total Energies One Tech, B-7181 Feluy, Belgium

[4] Univ Poitiers, Inst Chim Milieux & Mat Poitiers IC2MP, CNRS, UMR 7285,UFR SFA, Bat B27,4 Rue Michel Brunet,TSA 51106,51106, F-86073 Poitiers 9, France

来源：

JOURNAL OF CATALYSIS | 2024年 / 440卷

关键词：

Methyl mercaptan; Toluene; Para-xylene; Alkylation; ZSM-5; zeolite; Silylation; EXTERNAL SURFACE; METHANOL; XYLENE; KINETICS; HZSM-5; ISOMERIZATION; HYDROCARBONS; DEPOSITION; CONVERSION; TRANSPORT;

D O I：

10.1016/j.jcat.2024.115828

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees C. In terms of para-selectivity, outstanding performance was revealed by the silylated zeolites. Thus, over 12 % SiO2/H-ZSM-5, at 375 degrees C and WHSV = 9.4 g(toluene+CH3SH) g(cat)(-1)h(-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.

引用

页数：10

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