有序介孔氮化碳的制备及其催化Knoevenagel缩合反应

以四氯化碳和乙二胺为前驱体,介孔氧化硅SBA-15为硬模板剂,采用纳米浇铸法合成系列不同碳氮比的介孔类石墨相氮化碳材料CN-SBA15。通过N2吸附-脱附、XRD、TEM、FT-IR和XPS等对CN-SBA15进行表征,并考察其在苯甲醛和丙二腈Knoevenagel缩合反应中的催化性能。结果表明,CN-SBA15的比表面和孔体积与前驱体的比例有直接关系,很好地反向复制了原SBA-15的有序结构。CN-SBA15含有大量的N杂环结构,在Knoevenagel缩合反应中显示出较高的催化活性、重复使用性和底物普适性。

Preparation of ordered mesoporous carbon nitride andits catalytic application in knoevenagel condensation

Using carbon tetrachloride and ethanediamine as the precursors,and mesoporous silica SBA-15 as the hard template,a series of mesoporous graphitic carbon nitride (CN-SBA15) materials with various C/N molar ratios was synthesized by the nanocasting method.CN-SBA15 materials were characterized by means of N2 adsorption-desorption,XRD,TEM,FT-IR,and XPS spectroscopy,and their catalytic performance for Knoevenagel condensation reactions between benzaldehyde and malononitrile was investigated.The results demonstrated that the surface area and pore volume of CN-SBA15 depended on the ratio of the precursors,and CN-SBA15 had well negatively replicated the original ordered structure of SBA-15.Owing to its abundant N-containing heterocyclic structures,CN-SBA15 exhibited high catalytic activity,recyclability,and versatility in Knoevenagel condensation reactions.