硅胶负载丙磺酸催化剂的制备及其催化制生物柴油的性能

Preparation of Silica Supported Propane Sulfonic Acid and Catalytic Performance for Synthesis of Biodiesel

采用硅胶与3-巯丙基三甲氧基硅烷(MPTMS)制备不同巯基含量的巯基改性硅胶(MPS-SiO2),磺化后制得不同键合密度的硅胶负载丙磺酸固体酸催化剂(SO3H-P-SiO2),并采用紫外分光光度法、红外光谱(FT-IR)、热重-差热分析(TG-DTA)、氮气物理吸附等技术手段对其结构进行表征。以油酸为模型原料油,考察硅胶负载丙磺酸催化剂的键合密度与催化活性之间的关系。结果表明:硅胶负载丙磺酸催化剂在催化油酸酯化反应过程中具有良好的催化活性,活性随催化活性位键合密度的增大而提高。

The modified silicas（MPS-SiO2） with different sulfhydryl group content were prepared using silica and（3-mercaptopropyl） trimethoxysilane.Silica-based sulfonic acids（SO3H-P-SiO2） with different grafting degree were prepared by sulfonation of MPS-SiO2 and were characterized by ultraviolet（UV） spectrophotometry,Fourier infrared spectroscopy（FT-IR）,thermogravimetric-differential thermal analysis（TG-DTA） and N2 adsorption-desorption.The catalytic performance of silica supported propane sulfonic acid for preparation of biodiesel was investigated.The results showed that the silica supported propane sulfonic acid exhibited excellent catalytic activity,which increased with the increase of grafting degree.