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Study of Gas Phase m-Cresol Alkylation with Methanol on Solid Acid Catalysts

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The gas-phase alkylation of m-cresol with methanol was studied at 523 K on Al-MCM-41 and zeolites ZnY, HBEA, HZSM5 and HMCM22. The acidity was determined by ammonia TPD and FTIR of adsorbed pyridine. On acid sites of moderate strength (Al-MCM-41), initially the O-alkylation rate was higher than the C-alkylation rate. In contrast, formation of dimethylphenols by C-alkylation was highly favored on ZnY and HMCM22 which have both strong acidity although different nature; Lewis (ZnY) and Brønsted and Lewis (HMCM22). High selectivity of 2,5-DMP was observed on HZSM5, probably due to diffusional constraint. All catalysts, except Al-MCM-41, showed deactivation by coke formation.

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This work was supported by the Universidad Nacional del Litoral (UNL), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), Argentina.

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Correspondence to C. L. Padró.

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Acevedo, M.D., Bedogni, G.A., Okulik, N.B. et al. Study of Gas Phase m-Cresol Alkylation with Methanol on Solid Acid Catalysts. Catal Lett 144, 1946–1954 (2014).

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