介孔分子筛SBA-15-SO3H催化合成油酸甲酯

The catalytic properties of well-ordered, mesoporous, hybrid SBA-15 materials founctionalized with sulfonic acid group prepared by direct-synthesis were studied. The esterification result of oleic acid with methanol showed that the SBA-15-SO3H has the highest activity among the solid acid catalysts and almost approach that of sulfuric acid. The influences of reaction temperature, ratio of acid to methanol, catalyst amount were discussed. The optimal operation conditions are that reaction temperature 60 ℃, ratio of Methanol/Oleic acid 2∶1(mol/mol), ratio of catalyst to reactant 1 g/14 g. The X-ray diffractions of fresh and reacted SBA-15-SO3H show that the samples have a very intense low-angle peak, indicating the presence of uniformly sized pores in the materials. There are also two weak peaks in the reacted sample, which meaning the mesostructure was remained. By a way, the conversion of oleic acid during three time reactions showed this catalyst has higher stability. The catalystSBA-15-SO3H can be used to replace the liquid acid for the synthesis of fat acid ester.