介孔Ag_2S固载锰卟啉催化氧化环己烷性能研究

为了充分发挥5,10,15,20-四(4-吡啶基)锰卟啉(Mn TPyP)的催化活性和效率,用介孔硫化银对Mn TPyP进行轴向配位,形成了介孔硫化银固载5,10,15,20-四(4-吡啶基)锰卟啉(Mn TPyP/mp-Ag_2S)纳米孔仿生催化材料,用多种光谱技术对其进行表征.催化材料中S~(2-)与阳离子Mn~(3+)之间有很强的轴向配位作用,这使得催化材料催化氧化环己烷的活性大幅提高,环己烷转化率和醇酮产率分别提高了46.9%和29.6%.催化材料使用了5次后,其催化性能几乎没有下降,这归因于催化材料中强的轴向配位作用和纳米空腔结构功能作用的结果.

Research on Catalytic Oxidation of Cyclohexane over Manganese Porphyrin Immobilized on Mesoporous Ag2S

In order to increase the catalytic activity and the efficiency of 5,10,15,20-tetra (4-pyridyl) manganese porphyrin (Mn TPyP), Mn TPyP was axially coordinated to mesoporous silver sulfide (mp-Ag₂S), forming Manganese porphyrin supported on mesoporous silver sulfide (Mn TPyP/mp-Ag₂S)as a biomimetic catalytic material. The catalysts were characterized by various spectroscopic techniques. A strong axial coordination between S^2- anion and Mn³⁺ cations was found in the catalyst material, which greatly enhanced the catalytic activity of the catalyst material for cyclohexane oxidation. The conversion of cyclohexane and the yield of ketone and alcohol were increased 46.9% and 29.6% respectively. After five times recycles, the catalytic performance of the catalyst almost did not decrease. The excellent performance was attributed to the effect of the strong axial coordination and the nano-cavity structure function in the catalyst material on the catalytic performance.