Co-Phen-HAA/MMT催化分子氧氧化苯乙烯及其动力学研究

Preparation and catalytic activity of Co-phen-HAA/MMT and its kinetics

采用离子交换和配位合成方法,通过配位键将配体引入金属蒙脱土层间,制备了Co-PhenHAA /MMT负载型催化材料,采用IR、XRD、SEM的现代分析测试技术,分析了催化材料的结构,XRD显示蒙脱土层间距增大0.577 nrn,表明配体进入金属蒙脱土的片层间;在分子氧的氧化作用下,考察了反应温度、时间、溶剂等因素对苯乙烯环氧化反应的影响。实验结果表明,最佳反应温度82℃,反应时间8 h,苯乙烯的转化率为93.9%,反应活化能41.35 kJ/mol。

Ion exchange and coordination synthesis were used in this paper, and the Co-Phen HAA/ MMT catalytic materials were prepared by import metal ligand into montmorillonite interlayer. The catalytic material was characterized by the infrared spectrum, the X-ay diffraction analysis and the Standard Electronic Modules. The structure of the catalytic material was analysised. The layer spacing of montmorillonite increased 0. 577 m,this showed that the ligand has been put into the interlayer of metal montmorillonite. We studied the effect of reaction temperature,the amout of catalyst and styrene on the reaction rate, the experimental results showed that the optimum reaction temperature was 82℃ ,the catalytic oxidation conversion of styrene reached 93. 3% under the oxidative function of the molecular Oxygen after 8 h,the apparent activation energy Ea was 41.35 kJ/mol.