Chromium(VI) grafted mesoporous polyaniline as a reusable heterogeneous catalyst for oxidation reactions in aqueous medium
Chromium(VI) grafted mesoporous polyaniline as a reusable heterogeneous catalyst for oxidation reactions in aqueous medium
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DOI：
10.1039/c3ra47884j
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发表时间：
2014-03
期刊：
影响因子：
3.9
通讯作者：
Usha Mandi;M. Pramanik;A. Roy;N. Salam;A. Bhaumik;S. Islam
中科院分区：
文献类型：
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作者：
Usha Mandi;M. Pramanik;A. Roy;N. Salam;A. Bhaumik;S. Islam
通过苯胺的原位自由基聚合，再与重铬酸钾反应，制备了一种新型的Cr（VI）接枝的介孔聚苯胺材料（Cr-MPANI）。采用X射线粉末衍射（XRD）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（DRS）和热重分析（TGA）对材料进行了表征。粉末XRD和TEM研究表明，该样品中存在中间相和无序的蠕虫孔状介孔。Cr-MPANI作为一种非常有效的催化剂，用于烯烃、烷烃和芳香醇的液相氧化，使用30%H_2O_2作为氧化剂。氧化反应在非常温和的条件下进行，并且以非常高的选择性和相对高的产率获得所需产物。Cr-MPANI可以循环使用5次以上，而其各自的催化反应活性没有明显的损失。
A new Cr(VI)-grafted mesoporous polyaniline material (Cr-MPANI) has been prepared via simple and facile in situ radical polymerization of aniline followed by reaction with potassium dichromate. This material has been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis diffuse reflectance spectroscopy (DRS) and Thermogravimetric analysis (TGA). Powder XRD and TEM studies suggested the presence of mesophase and disordered wormhole-like mesopores in this sample. Cr-MPANI acts as a very efficient catalyst for the liquid phase oxidation of alkenes, alkanes and aromatic alcohols using 30% H2O2 as oxidant in water. Oxidation reactions were carried out under very mild conditions, and the desired products were obtained with very high selectivity and relatively high yields. Cr-MPANI can be recycled more than five times without an appreciable loss in activity for its respective catalytic reactions.