A series of Fe₃BO₆–xCeO₂ (x = 1, 5, 10, 20% by mole) mixtures was prepared via ball-milling process. The physicochemical properties of the mixtures have been characterized by X-ray diffraction, Fourier Transform Infrared Spectra, Scanning Electron Microscopy, Energy Dispersive X-Ray Spectroscopy, and N₂ Adsorption–Desorption techniques. The results showed that CeO₂ was well dispersed in the iron borate nano-particulate matrix after grinding. The oxidation of benzyl alcohol was investigated using the prepared catalysts. The reaction was carried out in a stirred reactor under reflux using liquid benzyl alcohol in the presence of hydrogen peroxide oxidant, focusing on the conversion and selectivity towards benzaldehyde. Optimization studies were carried out for the solvent type, temperature, reaction time, benzyl alcohol/catalyst ratio, and catalyst composition parameters. It was observed that conversion increased with CeO₂ addition up to a certain molar percentage but decreased again on further addition. 34.3% conversion and 81.5% benzaldehyde selectivity were reached after 4 h of reaction at 90 °C in a solvent-free environment with the catalyst containing 5% CeO₂. The catalyst was found to be stable when used under these conditions, and there was a slight decrease in its activity after three recycles.

Graphical Abstract

中文翻译：

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机械化学制备的 Fe3BO6–CeO2 催化剂无溶剂氧化苯甲醇

通过球磨工艺制备了一系列 Fe ₃ BO ₆ –xCeO ₂（x = 1、5、10、20% 摩尔）混合物。混合物的物理化学性质已通过 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜、能量色散 X 射线光谱和 N 2_吸附-解吸技术进行了表征。结果表明，CeO ₂研磨后良好分散在硼酸铁纳米颗粒基质中。使用制备的催化剂研究苯甲醇的氧化。该反应在搅拌反应器中在过氧化氢氧化剂存在下使用液体苯甲醇在回流下进行，重点关注转化率和对苯甲醛的选择性。对溶剂类型、温度、反应时间、苯甲醇/催化剂比和催化剂组成参数进行了优化研究。观察到转化率随着 CeO _{2 的}添加增加到一定的摩尔百分比，但在进一步添加时再次降低。使用含 5% CeO 的催化剂在 90 °C 无溶剂环境中反应 4 小时后，转化率达到 34.3%，苯甲醛选择性达到 81.5%₂ . 发现该催化剂在这些条件下使用时稳定，并且在三次循环后其活性略有下降。

图形概要