环己烷在Cu/SBA-15介孔催化剂上的选择性催化氧化

摘要

采用后嫁接法制备出了负载量为12％的Cu/SBA-15催化剂,借助N2吸附脱附、X射线衍射、透射扫描电子显微镜等分析检测方法表征了Cu/SBA-15催化剂的理化性质.在无任何有机溶剂及其他助剂的条件下,以空气为氧化剂使环己烷发生选择性氧化反应,评价了Cu/SBA-15催化剂的催化性能.结果表明,与SBA-15相比,Cu/SBA-15的比表面积、孔容等物理性能有所下降,能够很好地保持着SBA-15的介孔结构及长程有序性；SBA-15对环己烷的选择性氧化反应没有催化活性,Cu/SBA-15对环己烷的选择性氧化反应具有较强催化活性；使用Cu/SBA-15催化剂,环己烷转化率为41.72％,环己醇产率为14.12％,环己酮产率为27.6％.%Cu/SBA-15 (mass fraction of Cu 12％) supported catalyst was prepared by post-synthesis process and characterized by N2 adsorptiondesorption,X-ray diffraction and high resolution transmission electron microscopy.The behavior of the catalyst was evaluated through the selective catalytic oxidation of cyclohexane with air as oxidant in the absence of organic solvent and auxiliary agent.The results showed that Cu/SBA-15 maintained similar mesoporous structure and long-range order to SBA-15 and had lower specific surface area and pore volume compared to SBA-15.Cu/SBA-15 had higher catalytic activity and selectivity in the oxidation reaction of cyclohexane,but SBA-15 had no activity for the same reaction.In the presence of Cu/SBA-15,the conversion of cyclohexane was 41.72％,the yield of cyclohexanol was 14.12％ and cyclohexanone 27.6％.