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首页> 外文期刊>Catalysis science & technology >Facile synthesis of CuCr2O4 spinel nanoparticles: a recyclable heterogeneous catalyst for the one pot hydroxylation of benzene
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Facile synthesis of CuCr2O4 spinel nanoparticles: a recyclable heterogeneous catalyst for the one pot hydroxylation of benzene

机译：CUCR2O4尖晶石纳米颗粒的便捷合成：一种可回收的异质催化剂，用于苯的一锅羟基化

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摘要

A facile hydrothermal synthesis method is developed to prepare CuCr2O4 spinel nanoparticle catalysts with sizes between 25-50 nm. A detailed characterization of the material was carried out by XRD, ICP-AES, XPS, EXAFS, SEM, TEM, and TGA. XRD revealed the formation of a CuCr2O4 spinel phase and TEM showed the that particles size was 20-50 nm. The catalyst was highly active for the selective oxidation of benzene to phenol with H2O2. The influence of reaction parameters such as temperature, solvent, substrate to oxidant molar ratio, reaction time, etc. were investigated in detail. The reusability of the catalyst was tested by conducting the same experiments with the spent catalyst and it was found that the catalyst did not show any significant activity loss, even after 5 reuses. A benzene conversion of 72.5% with 94% phenol selectivity was achieved over this catalyst at 80 degrees C. However, significant H2O2 decomposition occurs on the catalyst, necessitating its usage in five-fold excess.
机译：开发了一种简便的热液合成方法来制备具有25-50 nm尺寸的CUCR2O4尖晶石纳米颗粒催化剂。 XRD，ICP-AES，XPS，EXAFS，SEM，TEM和TGA对材料进行了详细的表征。 XRD揭示了CUCR2O4尖晶石相的形成，TEM显示颗粒的大小为20-50 nm。该催化剂对于用H2O2的苯对苯酚的选择性氧化而高度活跃。详细研究了反应参数，例如温度，溶剂，底物对氧化剂摩尔比，反应时间等的影响。通过用消耗催化剂进行相同的实验来测试催化剂的可重复使用性，发现催化剂即使在5个重用后也没有显示出任何显着的活性损失。在80度的催化剂上，该催化剂的苯转化为72.5％。但是，催化剂上发生了显着的H2O2分解，因此需要其用途五倍过量。

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