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使用1,2-二(三甲氧基甲硅烷基)乙烷和正硅酸甲酯两种硅脂分别与3-巯丙基三乙氧基硅烷共缩聚,合成出巯基修饰的含有乙烷桥键的硅基介孔材料(BM-n)以及巯基修饰的纯硅基介孔材料(TM-n),并用浓硝酸将其氧化,顺利的把修饰的巯基官能团氧化成磺酸基团(-SO3H)。使用SEM、TEM、小角度XRD和N2吸附脱附仪、FT-IR、元素分析、固体13 C-NMR等多种手段对其进行了表征。把得到的材料作为固体酸催化剂,催化丙酸与乙醇的酯化反应。结果表明骨架疏水性更强的乙烷桥键介孔硅基磺酸材料表现出更高的催化活性。
Two bis-tri (trimethoxysilyl) ethane and methyl orthosilicate were co-polycondensation with 3-mercaptopropyltriethoxysilane to synthesize mercapto-modified poly (BM-n) and mercapto-modified pure silica-based mesoporous materials (TM-n) were synthesized and oxidized with concentrated nitric acid to smoothly oxidize the modified thiol groups into sulfonic acid groups (-SO3H ). The samples were characterized by SEM, TEM, XRD and N2 adsorption desorption spectroscopy, FT-IR, elemental analysis and solid-state 13 C-NMR. The obtained material as a solid acid catalyst, catalytic propionic acid and ethanol esterification reaction. The results show that the ethane-bridged mesoporous silica-based sulfonic acid materials with stronger backbone hydrophobicity show higher catalytic activity.