Pickering emulsions assisted synthesis of fatty acetal over phenyl sulfonic groups grafted on activated charcoal
Résumé
Activated charcoal Darco® KB-G, was functionalized with phenyl sulfonic groups (Ph-SO3H) by surface modification
in acidic aqueous media under mild conditions (25 °C, Patm). The formation of new CeC covalent bonds
was confirmed by both TGA and XPS. The functionalized amphiphilic solids were also characterized by nitrogen
adsorption-desorption, SEM, IR and Raman spectroscopy. The reference solid Darco-0.50ASFL stabilized dodecyl
aldehyde/ethylene glycol by Pickering emulsions and demonstrated both good activity and selectivity in a
solvent-free biphasic acetalization. Kinetic studies of the formation of hemiacetal and acetal were investigated by
monitoring the progress of the reaction by HPLC. Experimental kinetic profiles of dodecyl aldehyde, hemiacetal
and acetal were compared to model kinetic profiles. The recycling of Darco-0.50ASFL was also studied by
performing five consecutive catalytic runs without regeneration of the catalyst.
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