Monodispersed poly(4-vinylpyridine) spheres supported Fe(III) material: An efficient and reusable catalyst for benzylic oxidation
Monodispersed poly(4-vinylpyridine) spheres supported Fe(III) material: An efficient and reusable catalyst for benzylic oxidation
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DOI：
10.1016/j.molcata.2015.04.011
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发表时间：
2015-08
影响因子：
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通讯作者：
Shuang Fan;Y. Luan;Jingjing Wang;Hongyi Gao;Xiaowei Zhang;Ge Wang
中科院分区：
文献类型：
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作者：
Shuang Fan;Y. Luan;Jingjing Wang;Hongyi Gao;Xiaowei Zhang;Ge Wang
采用配位化学方法制备了一种新型氯化铁固载聚4-乙烯基吡啶（P4 VP）催化剂。聚（4-乙烯基吡啶）球的吡啶部分作为氮供体结合铁离子，以及减少在催化反应体系中使用的吡啶的量。在催化过程中，单分散催化剂在有机溶剂中分散良好，利用其纳米形态和均匀的尺寸。考察了不同二乙烯基苯（DVB）质量分数的单分散催化剂的催化活性，并探讨了负载型Fe（III）在催化剂中的负载量。P4 VPDVB 10%-Fe（III）催化剂在苄型亚甲基和仲苄醇的苄型氧化反应中表现出较高的催化活性。该催化剂易于从反应体系中分离出来，重复使用多次，催化活性无明显下降。此外，浸出试验表明，所合成的P4 VPDVB 10%-Fe（III）催化剂是真正的非均相催化剂，没有显著的金属浸出。
A novel ferric chloride immobilized poly(4-vinylpyridine) (P4VP) catalyst was developed via a coordination chemistry-based approach. The pyridine moiety of poly(4-vinylpyridine) spheres functioned as the nitrogen donor to bind iron ions, as well as to decrease the amount of pyridine used in the catalytic reaction system. The monodispersed catalyst was well dispersed in the organic solvent during the catalytic procedure, taking advantage of its nanomorphology and uniform size. The catalytic activity of various monodispersed catalysts based different mass fractions of the divinylbenzene (DVB) was investigated, meanwhile the capacities of supported Fe(III) in the various catalysts were also discussed. The P4VPDVB10%-Fe(III) catalyst exhibited high catalytic activity in the benzylic oxidation of benzylic methylenes and secondary benzylic alcohols. It was easily separated from the reaction system and reused several times without obvious degradation of catalytic activity. Moreover, leaching tests suggested that the as-synthesized P4VPDVB10%-Fe(III) catalyst was a true heterogeneous catalyst without significant metal leaching.