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首页> 外文期刊>Journal of Applied Polymer Science >Immobilization of Manganoporphyrin on a Novel Polymeric Support and Catalytic Oxidation Characteristic of Supported Catalyst
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Immobilization of Manganoporphyrin on a Novel Polymeric Support and Catalytic Oxidation Characteristic of Supported Catalyst

机译：锰卟啉在新型聚合物载体上的固定化及负载型催化剂的催化氧化特性

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Monomer glycidyl methacrylate (GMA) was grafted on silica gel particles in the manner of “grafting from,”and the grafted particles PGMA/SiO_2 was prepared. The grafted particles PGMA/SiO2 is a kind of novel support for the immobilization of metalloporphyrin catalysts. In the presence of basic catalysts, the ring-opening reaction of the epoxy groups of the grafted PGMA occurred and the bonding of meso-tetra (4-hydroxylphenyl) porphyrin (THPP) on the particles PGMA/SiO_2 was realized, resulting in the bonded particles HPPPGMA/ SiO_2. Subsequently, the metallation of the bonded particles HPP-PGMA/SiO_2 was carried out via the coordination reaction between HPP-PGMA/SiO_2 and manganese salt, resulting in the supported manganoporphyrin (MnP) catalyst MnP-PGMA/SiO_2. The supported catalyst was used in the catalytic oxidation of ethyl benzene into acetophenone by molecular oxygen. In this article, the effects of various factors such as the species and amount of the catalyst on the bonding process of THPP were studied because of the importance of the bonding reaction of THPP in the preparation of the catalyst MnP-PGMA/SiO_2. Finally, the catalytic performance of MnP-PGMA/SiO_2 in the catalytic oxidation process of ethyl benzene was investigated. The experimental results show that triethylamine is a suitable catalyst for the bonding of THPP on the grafted particles PGMA/SiO_2 and for the forming of MnP-PGMA/SiO_2. The supported catalyst MnP-PGMA/SiO_2 can effectively activate molecular oxygen, and obviously catalyze the oxidation process of ethyl benzene to acetophenone by molecular oxygen. It was found that the immobilization density of MnP on MnP-PGMA/SiO_2 has a great effect on the catalytic activity of the catalyst.
机译：以“接枝”的方式将单体甲基丙烯酸缩水甘油酯（GMA）接枝到硅胶颗粒上，制备了接枝颗粒PGMA / SiO_2。接枝颗粒PGMA / SiO2是金属卟啉催化剂固定化的一种新型载体。在碱性催化剂的存在下，接枝PGMA的环氧基发生开环反应，并实现了介孔四（4-羟苯基）卟啉（THPP）在颗粒PGMA / SiO_2上的键合。颗粒HPPPGMA / SiO_2。随后，通过HPP-PGMA / SiO_2和锰盐之间的配位反应使结合的颗粒HPP-PGMA / SiO_2进行金属化，得到负载型锰卟啉（MnP）催化剂MnP-PGMA / SiO_2。负载型催化剂用于通过分子氧将乙苯催化氧化为苯乙酮。由于THPP的键合反应在催化剂MnP-PGMA / SiO_2的制备中具有重要意义，本文研究了催化剂种类和用量等因素对THPP键合过程的影响。最后，研究了MnP-PGMA / SiO_2在乙苯催化氧化过程中的催化性能。实验结果表明，三乙胺是THPP在接枝颗粒PGMA / SiO_2上键合和MnP-PGMA / SiO_2形成的合适催化剂。负载型催化剂MnP-PGMA / SiO_2能有效活化分子氧，并明显地催化分子氧催化乙苯氧化为苯乙酮。发现MnP在MnP-PGMA / SiO_2上的固定密度对催化剂的催化活性有很大的影响。

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