论文部分内容阅读
以硝酸铁和均苯三酸为原料,采用水热方法合成了金属有机骨架材料MIL-100(Fe),并采用不同浓度的己二胺乙醇溶液进行后修饰,制备得到氨基化的金属有机骨架材料MIL-100(Fe)-NH2。利用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)和透射电镜(TEM)等技术对MIL-100(Fe)-NH2材料的结构和形貌进行了表征。以苯甲醛和氰基乙酸乙酯的Knoevenagel缩合反应为模型反应,考察了MIL-100(Fe)-NH2作为固体碱催化剂的催化性能和循环稳定性。研究结果表明,采用低浓度的修饰剂可以制备结构保持的氨基功能化材料MIL-100(Fe)-NH2。该材料能够快速催化苯甲醛和氰基乙酸乙酯的Knoevenagel缩合反应,而且可以循环使用至少4次而没有明显活性损失。
Ferric nitrate and trimellitic acid were used as raw materials to synthesize the metal-organic framework material MIL-100 (Fe) by hydrothermal method and post-modification with different concentrations of hexamethylenediamine in ethanol to prepare the aminated metal organic framework Material MIL-100 (Fe) -NH2. The structure and morphology of MIL-100 (Fe) -NH2 were characterized by XRD, FT-IR, SEM and TEM. Characterization. Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate was used as a model reaction to investigate the catalytic performance and cycling stability of MIL-100 (Fe) -NH2 as a solid base catalyst. The results showed that the structurally maintained amino-functionalized material MIL-100 (Fe) -NH2 could be prepared with low concentration of modifier. This material rapidly catalyzes the Knoevenagel condensation of benzaldehyde and ethyl cyanoacetate and can be recycled at least 4 times without significant loss of activity.