【摘要】 采用溶胶凝胶法以柠檬酸铁为铁源合成含Fe纳米介孔材料。室温下凝胶样品60℃真空干燥后得到的干凝胶采用热重分析（TG）。最终400℃焙烧3h得到介孔Fe₂O₃/SiO₂纳米粒子。合成材料的结构和性能采用XRD、N₂吸脱附、TEM、FT-IF、及H₂-TPR测试方法表征,结果显示合成了尺寸约50nm的带有3.0⁴.5nm介孔孔道的球形Fe₂O₃/SiO₂纳米粒子,并且引入了高分散的Fe³⁺物种。通过傅克烷基化法合成二苯甲烷的反应测试样品催化性能,实验结果表明该催化剂具有优异的催化性能,高达100%苄基氯的转化率和相对较高的二苯甲烷的选择性,并且能够重复利用。更多还原

【Abstract】 Using sol-gel method, the iron-containing nanocomposites with the ferric citrate as iron source were synthesized. The clear sols were gelated at room temperature and then treated at 60 oC in vacuum to get dry gels which were characterized by thermogravimetric analysis（TG）. Finally, mesoporous Fe₂ O₃/Si O₂ nanoparticles were obtained by the calciner at 400 oC for 3 h. The structure and properties of synthesized particles were investigated by X-ray diffraction（XRD）, N₂ adsorption-desorption technique, transmission electron microscopy（TEM）, Fourier-transform IR spectroscopy（FT-IR）, and temperature programmed reduction（H₂-TPR）. Results reveal that the iron active centers are incorporated into the silica framework with spherical particles size about 50 nm and an average pore diameter of 3.0⁴.5 nm. The catalytic activity of nanocatalysts was tested in the synthesized diphenylmethane by Friedel-Crafts alkylation reaction. Results show that the catalysts exhibit an excellent activity with 100% conversion of benzyl chloride and relatively higher selectivity to diphenylmethane, and could be reused multiple times.更多还原