Renewable glycerol esterification over sulfonic-modified mesoporous silicas

Margarita Popova, Hristina Lazarova, Agnes Szegedi, Magdolna R. Mihályi, Мojca Rangus, Blaz Likozar, Venkata D.B.C. Dasireddy

Abstract


SO3H-functionalised mesoporous materials with different pore struc­tures (SBA-15 and SBA-16) were prepared by the post-synthesis surface mod­ification. The materials were thoroughly characterized by X-ray powder dif­fract­ion, nitrogen physisorption, temperature-gravimetric analysis, elemental analysis and solid state NMR spectroscopy. The acidic properties were inves­tigated by the temperature-programed desorption of ammonia. The catalytic performance of SO3H-functionalised mesoporous materials was studied in gly­cerol esterification with acetic acid. The different amount of silanol groups in the initial SBA-15 and SBA-16 silicas predetermined the different amount of propylsulfonic groups which are formed in them and therefore significantly inf­luenced the acidity and the catalytic performance in glycerol esterification. Much higher amount of Brönsted acid sites was generated in SO3H modified SBA-15 catalyst, which exhibited higher activity to value-added triacetyl glycerol.


Keywords


glycerol esterification, SO3H, mesoporous silica, SBA-15, SBA-16

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DOI: https://doi.org/10.2298/JSC170306071P

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