1. Acetalization of glycerol with hexanal in the presence of SBA-15 with sulfonic acid groups.
- Author
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Castanheiro, J.E., Vital, J., Fonseca, I.M., and Ramos, A.M.
- Subjects
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SULFONIC acids , *MESOPOROUS silica , *CATALYTIC activity , *SURFACES (Technology) , *X-ray diffraction - Abstract
Acetalization of glycerol with hexanal was studied over sulfonic acid-functionalized mesoporous silica (SBA-15), at 70 ºC. The product obtained were (2-pentyl-1,3-dioxolan-4-yl)methanol and 2-pentyl-1,3-dioxan-5-ol. Materials with different amounts of sulfonic acid groups were prepared. The support functionalization was achieved by the introduction of 3-(mercaptopropyl)trimethoxysilane onto the surface of these materials by grafting technique. The [SO 3 H]-SBA-15 catalysts were characterized by nitrogen adsorption at 77 K, X-ray diffraction, SEM and titrations. All the catalysts were active in the studied reaction being the [SO 3 H] 3 -SBA-15 the best one. It was observed that the reaction rate increase with the amount of sulfonic acid groups on SBA-15 until a maximum. With high amounts of sulfonic groups, a decrease of activity is observed. Good values of selectivity to (2-pentyl-1,3-dioxolan-4-yl)methanol were obtained with mesoporous silicas anchored sulfonic acid groups. Catalytic stability of the [SO 3 H] 3 -SBA-15 was evaluated by performing consecutive batch runs with the same catalyst sample. The material showed a good catalytic stabilization. [Display omitted] • Acetalization of glycerol with hexanal was carried out over SBA-15 with sulfonic groups. • High catalytic activity of [SO 3 H] 3 -SBA-15. • Good selectivity to (2-pentyl-1,3-dioxolan-4-yl) methanol product. • Good catalytic activity after the fifth use. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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