In this paper, a novel sulfonic acid containing magnetic methylene-based organosilica with core-shell structure (Fe₃O₄@OS−SO₃H) is synthesized, characterized and its catalytic application is investigated for biodiesel production via esterification of carboxylic acids with alcohols. The Fe₃O₄@OS−SO₃H was synthesized via co-condensation of tetraethyl orthosilicate (TEOS) and 1,2-bis(triethoxysilyl)methane (BTEM) around magnetite nanoparticles. The Fe₃O₄@OS−SO₃H nanocatalyst was characterized by using FT-IR, PXRD, TGA, VSM, TEM and SEM techniques. The catalytic study showed that the Fe₃O₄@OS−SO₃H nanocomposite can be used as an effective, powerful, selective and recyclable catalyst for the esterification of carboxylic acids with alcohols at 70°C under solvent-free conditions. This nanocatalyst was recovered and reused several times without significant decrease in efficiency and stability.

本文提出了一种新型的含磺酸的磁性亚甲基基有机硅，其具有核-壳结构（铁₃Ø₄ @操作系统-所以₃H）的合成，表征及其在羧酸与醇酯化反应中生产生物柴油的催化应用进行了研究。的铁₃Ø₄ @操作系统-所以₃H通过原硅酸四乙酯（TEOS）和1,2-双（三乙氧基甲硅烷基）甲烷（BTEM）在磁铁矿纳米粒子周围的缩聚反应合成了C3。的铁₃Ø₄ @操作系统-所以₃H通过FT-IR，PXRD，TGA，VSM，TEM和SEM技术对纳米催化剂进行了表征。催化研究表明铁₃Ø₄ @操作系统-所以₃H纳米复合材料可用作有效，强大，选择性和可回收的催化剂，用于在无溶剂条件下于70°C下将羧酸与醇进行酯化反应。该纳米催化剂被回收并重复使用了几次，而效率和稳定性没有明显降低。