介孔分子筛SBA-15-SO3H催化合成油酸甲酯

在成功合成出含磺酸基的介孔分子筛SBA-15-SO3H的基础上，用于油酸与甲醇的酯化反应，考察该催化剂的催化性能，结果表明：在高级脂肪酸的酯化反应中，SBA-15-SO3H催化剂的活性高于沸石分子筛，与等摩尔数的硫酸的活性接近。考察了反应条件对SBA-15-SO3H催化剂性能的影响，得到油酸与甲醇酯化反应的最佳条件：反应温度60 ℃，甲醇与油酸的原料比为2∶1（摩尔），催化剂与原料比为1.5∶35（重量）。最后对催化剂的稳定性进行了考察，反应结果认为该催化剂在重复使用过程中活性未发生明显变化，反应前后的XRD分析结果认为，SBA-15-SO3H具有较高的水热稳定性。

SYNTHESIS OF METHYL OLEATE OVER SBA-15 MESOPOROUS MATERIALS

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.